573 Senior Developer jobs in London

We are seeking Mid-Level Application Software Engineers to join our clients growing team where you’ll play a key role in designing and developing cutting-edge software for audio and live performance technology, collaborating with a supportive and dynamic team dedicated to enhancing the live experience for artists and audiences alike.

What You’ll Do

• Develop and maintain desktop applications for audio and live performance environments
li>Work on cross-platform solutions for Embedded Linux, macOS, and iOS
• Collaborate in Agile teams, contributing to sprint planning, code reviews, and CI/CD pipelines
• Build intuitive graphical user interfaces (GUI) with Qt/QtQuick
• Integrate networking features using TCP/IP for seamless device communication
• Support the evolution of products that shape the sound of live performances globally

What We're Looking For

• Strong proficiency in C++ and C#
• Experience with multithreading and complex, concurrent software systems
• Familiarity with cross-platform desktop development (Embedded Linux/macOS/iOS)
• Understanding of Agile methodologies, CI/CD, and version control
• Networking knowledge (TCP/IP)
• Bonus: Experience or interest in Delphi, Flutter, and full-stack development
• Appreciation for audio mixing technology and live streaming
• Interest in hardware/software integration (FPGA/embedded systems)

You’ll Thrive Here If You…

• Are self-motivated, proactive, and eager to solve complex problems
• Communicate effectively and enjoy collaborating in a team
• Bring prior experience in audio technology or related fields (a plus, not a must)

Why Join?

• Innovative Culture: Help develop new products and enhance existing solutions at the forefront of audio technology
• Real-World Impact: Your work will be used by leading audio professionals on stages and in studios around the world
• Career Growth: Structured progression and opportunities to make a tangible impact
• Work-Life Balance: Flexible hours and a hybrid office model
• Collaborative Team: Work alongside passionate engineers dedicated to delivering the best in live audio technology

If you’re excited about shaping the future of live performance technology and want to work with a team that shares your passion for audio and music, apply now!

Why work for us?
A career at Janus Henderson is more than a job, it's about investing in a brighter future together.
Our Mission at Janus Henderson is to help clients define and achieve superior financial outcomes through differentiated insights, disciplined investments, and world-class service. We will do this by protecting and growing our core business, amplifying our strengths and diversifying where we have the right.
Our Values are key to driving our success, and are at the heart of everything we do:
Clients Come First - Always | Execution Supersedes Intention | Together We Win | Diversity Improves Results | Truth Builds Trust
If our mission, values, and purpose align with your own, we would love to hear from you!
Your opportunity
As Application Developer, you will be responsible for defining and developing business and systems solutions as well as leading ongoing support for existing ones. You will be an integral member of the Product Master IT Team, working closely with business partners, vendors and other IT Product delivery team members to ensure full delivery of the product lifecycle.
+ Research, design, develop, test, debug, document and support custom .NET applications and Data Warehouse solutions in support of the business needs.
+ Partner with the Product Owner, business stakeholders, and IT delivery team members to deliver and support technology solutions.
+ Deliver to time-sensitive product release schedules by collaborating with team members in an agile development environment.
+ Produce technical specifications and release notes for required features and architectural/framework improvements.
+ Provide ongoing change management including training and documentation updates.
+ Collaborate closely with the wider technology teams to coordinate interdependencies, resolve issues, and understand overlaps of teams and applications.
Must have skills
+ Proven experience in the IT field with hands-on experience in system architecture and enterprise data.
+ Proficient with programming languages (C#, ASP.NET.NET Core, SQL).
+ Demonstrated experience in working with REST APIs.
+ Demonstrated experience in working with Cloud data warehouse like Databricks and Snowflake.
+ Demonstrated experience in working with modern cloud data and DevOps techniques.
+ Strong understanding of Agile methodologies with experience working on Agile delivery teams.
+ Exceptional communication skills with the ability to communicate appropriately with both business leadership and technical teams.
+ Fair understanding of Microsoft technology stack. Specifically: C#, Web APIs, SQL Server, Entity Framework, Visual Studio.
+ Understanding of differences between standard and .NET core platform.
Nice to have skills
+ Knowledge of the Asset Management business, preferably in Distribution and Marketing.
+ An enthusiasm for software development and acquiring new skills and knowledge, both in the technology and investments arenas.
+ An exposure to collaboration tools such as Git / Source control, JIRA, Confluence and Teams.
+ UI / front end development skills using web technologies.
What to expect when you join our firm
+ Hybrid working and reasonable accommodations
+ Generous Holiday policies
+ Excellent Health and Wellbeing benefits including corporate membership to ClassPass
+ Paid volunteer time to step away from your desk and into the community
+ Support to grow through professional development courses, tuition/qualification reimbursement and more
+ All-inclusive approach to Diversity, Equity and Inclusion
+ Maternal/paternal leave benefits and family services
+ Complimentary subscription to Headspace - the mindfulness app
+ All employee events including networking opportunities and social activities
+ Lunch allowance for use within our subsidized onsite canteen
Supervisory responsibilities
+ No
Potential for growth
+ Mentoring
+ Leadership development programs
+ Regular training
+ Career development services
+ Continuing education courses
You will be expected to understand the regulatory obligations of the firm, and abide by the regulated entity requirements and JHI policies applicable for your role.
At Janus Henderson Investors we're committed to an inclusive and supportive environment. We believe diversity improves results and we welcome applications from all backgrounds. Don't worry if you don't think you tick every box, we still want to hear from you! We understand everyone has different commitments and while we can't accommodate every flexible working request we're happy to be asked about work flexibility and our hybrid working environment. If you need any reasonable accommodations during our recruitment process, please get in touch and let us know at
LI-LN1 #LI-Hybrid
Janus Henderson (including its subsidiaries) will not maintain existing or sponsor new industry registrations or licenses where not supported by an employee's job functions (as determined by Janus Henderson at its sole discretion).
All applicants must be willing to comply with the provisions of Janus Henderson Investment Advisory Code of Ethics related to personal securities activities and other disclosure and certification requirements, including past political contributions and political activities. Applicants' past political contributions or activity may impact applicants' eligibility for this position. Janus Henderson is an equal opportunity /Affirmative Action employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status. All applications are subject to background checks.

**Introduction**
At IBM CIC, we deliver deep technical and industry expertise to a wide range of public and private sector clients in the UK.
A career in IBM CIC means you'll have the opportunity to work with visionaries across multiple industries to improve the hybrid cloud and AI journey for the most innovative and valuable companies in the world. Your ability to accelerate impact and make meaningful change for your clients is enabled by our strategic partner ecosystem and our robust technology platforms across the IBM portfolio.
Curiosity and a constant quest for knowledge serve as the foundation to success here. You'll be encouraged to challenge the norm, investigate ideas outside of your role, and come up with creative solutions which impact a wide network of clients, whom may be at their site or one of our CIC or IBM locations. Our culture of evolution centres on long-term career growth and development opportunities in an environment that embraces your unique skills and experience.
We offer:
* Many training opportunities from classroom to e-learning, mentoring and coaching programs and the chance to gain industry recognized certifications
* Regular and frequent promotion opportunities to ensure you can drive and develop your career with us
* Feedback and checkpoints throughout the year
* Diversity & Inclusion as an essential and authentic component of our culture through our policies and process as well as our Employee Champion teams and support networks
* A culture where your ideas for growth and innovation are always welcome
* Internal recognition programs for peer-to-peer appreciation as well as from manager to employees
* Tools and policies to support your work-life balance from flexible working approaches, sabbatical programs, paid paternity leave, maternity leave and an innovative maternity returners scheme
* More traditional benefits, such as 25 days holiday (in addition to public holidays), online shopping discounts, an Employee Assistance Program, a group personal pension plan of an additional 5% of your base salary paid by us monthly to save for your future.
**Your role and responsibilities**
We're seeking a Managing DevOps Engineer to significantly contribute to our DevOps efforts. In this role, you'll lead projects, guide engineering teams, and shape our technical direction in DevOps practices. You will also actively participate in the entire DevOps lifecycle, focusing on automating and streamlining software delivery pipelines using modern DevOps tools and methodologies.
Responsibilities
* Design, develop, and maintain robust, scalable, and secure DevOps infrastructure and processes using modern tools and methodologies.
* Guide and mentor junior and mid-level engineers, fostering a culture of innovation, quality, and efficiency in DevOps practices.
* Lead the resolution of complex technical challenges, applying your deep expertise in DevOps.
* Drive continuous improvement in our DevOps practices, ensuring alignment with industry standards and best practices.
* Shape the technical direction of our DevOps initiatives and contribute to strategic decision-making
**Required technical and professional expertise**
* Extensive experience in DevOps practices and CI/CD pipeline development.
* Exceptional communication, facilitation, and coaching skills.
* Strong decision-making and problem-solving abilities.
* Ability to influence stakeholders at all levels and drive organizational change.
* Proven experience in leading DevOps initiatives and projects.
As an equal opportunities' employer, we welcome applications from individuals of all backgrounds. However, for you to be eligible for this role, you must have the valid right to work in the UK. Unfortunately, we do not offer visa sponsorship and have no future plans to do so. You must be a resident in the UK and have been living continuously in the UK for the last 10 years. You must be able to hold or gain a UK government security clearance.
**Preferred technical and professional experience**
* Experience with CI/CD tools (e.g., Jenkins, GitLab CI/CD, CircleCI).
* Familiarity with configuration management tools (e.g., Ansible, Puppet, Chef).
* Knowledge of infrastructure as code (IaC) tools (e.g., Terraform, CloudFormation).
* Experience with monitoring and logging tools (e.g., Prometheus, ELK Stack, Datadog).
* Passion for continuous learning and professional development.
IBM is committed to creating a diverse environment and is proud to be an equal-opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, gender, gender identity or expression, sexual orientation, national origin, caste, genetics, pregnancy, disability, neurodivergence, age, veteran status, or other characteristics. IBM is also committed to compliance with all fair employment practices regarding citizenship and immigration status.

**Introduction**
At IBM CIC, we deliver deep technical and industry expertise to a wide range of public and private sector clients in the UK.
A career in IBM CIC means you'll have the opportunity to work with visionaries across multiple industries to improve the hybrid cloud and AI journey for the most innovative and valuable companies in the world. Your ability to accelerate impact and make meaningful change for your clients is enabled by our strategic partner ecosystem and our robust technology platforms across the IBM portfolio.
Curiosity and a constant quest for knowledge serve as the foundation to success in IBM CIC. In your role, you'll be encouraged to challenge the norm, investigate ideas outside of your role, and come up with creative solutions which impact a wide network of clients, whom may be at their site or one of our CIC or IBM locations. Our culture of evolution centres on long-term career growth and development opportunities in an environment that embraces your unique skills and experience.
We offer:
* A multitude of training opportunities from classroom to e-learning, mentoring and coaching programs as well as the chance to gain industry recognized certifications
* Regular and frequent promotion and progression opportunities to ensure you can drive and develop your career with us
* Feedback and checkpoints throughout the year
* Diversity & Inclusion as an essential and authentic component of our culture through our policies and process as well as our Employee Champion teams and support networks
* A culture where your ideas for growth and innovation are always welcome
* Internal recognition programs for peer-to-peer appreciation as well as from manager to employees
* Tools and policies to support your work-life balance from flexible working approaches, sabbatical programs, paid paternity leave, maternity leave and an innovative maternity returners scheme
* More traditional benefits, such as 25 days holiday (in addition to public holidays), online shopping discounts, an Employee Assistance Program, a group personal pension plan of an additional 5% of your base salary paid by us monthly to save for your future.
**Your role and responsibilities**
We're seeking a FullStack Application Developer to significantly contribute to our cloud development efforts. In this role, you'll lead smaller projects, guide junior developers, and shape our technical direction in full-stack cloud development.
You will actively participate in the entire software development lifecycle, focusing on designing, coding, developer testing, and deploying cloud-native applications using modern full-stack technologies.
Responsibilities
* Project Leadership: Lead smaller projects from design through deployment, showcasing strong technical and project management skills.
* Mentorship: Guide and support Junior Developers, fostering their growth and development.
* Technical Leadership: Contribute to the definition of our development practices and the technical vision of our cloud applications.
* Quality Assurance: Ensure all code developed meets high standards for quality, maintainability, and performance.
* Complex Problem Solving: Tackle and resolve intricate technical challenges, applying your deep expertise in full-stack cloud development
**Required technical and professional expertise**
* Proven, and current hands on advanced full-stack development skills, including both front-end (HTML, CSS, JavaScript) and back-end (e.g., Node.js, Python, Ruby, lambda S3 DynamoDB etc)
* Extensive experience with the AWS cloud platform
* Proficient in using version control systems (e.g., Git) and experience with CI/CD pipelines.
* Exceptional problem-solving capabilities, with a history of effectively addressing and resolving complex engineering issues.
* Excellent verbal and written communication skills to articulate technical concepts to both technical and non-technical stakeholders.
As an equal opportunities' employer, we welcome applications from individuals of all backgrounds. However, for you to be eligible for this role, you must have the valid right to work in the UK. Unfortunately, we do not offer visa sponsorship and have no future plans to do so. You must be a resident in the UK and have been living continuously in the UK for the last 10 years. You must be able to hold or gain a UK government security clearance.
**Preferred technical and professional experience**
* Experience with containerization technologies (Docker, Kubernetes).
* Knowledge of serverless architectures and microservices.
* Familiarity with event-driven design patterns.
* Understanding of database systems (SQL, NoSQL).
* Experience with cloud security best practices
IBM is committed to creating a diverse environment and is proud to be an equal-opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, gender, gender identity or expression, sexual orientation, national origin, caste, genetics, pregnancy, disability, neurodivergence, age, veteran status, or other characteristics. IBM is also committed to compliance with all fair employment practices regarding citizenship and immigration status.

We are recruiting for an experienced Senior IT Database and Application Developer. The role is permanent, full time with a hybrid working style. We are based in Billericay, Essex close to the train station and are required to work 3 days in the office and 2 days at home.

The role is offering up to £75,000 per annum dependant on experience along with a competitive benefits package

Supervision

Reports to and works under the administrative supervision of the Software Development Team Lead.

Summary

The IT Database and Applications Developer is a member of the Software Development Team who are responsible for delivering platforms and solutions to the business and its clients.

The candidate is responsible for the development and maintenance of database dependent platforms and solutions, as well as the ongoing maintenance and management of the company’s database installations.

Working together with the IT Infrastructure Team, the IT Database Developer assumes responsibility for all aspects of database operation.

The candidate will also be expected to write and modify desktop applications and services. The main programming language used will be C#. A good knowledge of software and solutions architecture is required here rather than knowledge and experience of any specific programming language.

Essential Duties

As part of a development team work on the construction of new functionality within the database layers to meet business requirements. Manage and improve existing functionality, identify and fix any defects. Keep up to date with latest developments in the industry and ensure solutions remain compatible so that future database upgrades are possible.

Carry out database administrative tasks such as user maintenance, audit log reviews, change control reviews, data archiving, performance measuring and monitoring.

Carry out routine patching to keep up to date with security threats and maintain compliance with security standards and policies.

Work with the Software Development Team Lead to ensure initiatives are delivered on time and to client satisfaction.

Develop and modify applications and services using C#/.Net/.Net core. There will be opportunities to develop in other languages, such as C++, Delphi, PHP. The candidate will be expected to contribute where required.

All development must be carried out to existing coding standards.

The candidate will be expected to act as a mentor and project lead for some of the more junior members of the team.

Key Deliverables

• Design and develop logical and efficient solutions based on understanding objectives and requirements
• Produce work of high quality with an emphasis on reliability, scalability and
• performance
• Develop solutions with an awareness of security and best practices
• Create technical documentation for solutions
• Participate in reviews/audits ensuring that compliance with regulations and accreditations are maintained
• Work with the Software Development Team Lead to deliver all company

Objectives

• Lead small projects and be the lead developer.
• Meet and exceed all company and individual goals in line with the Company’s
• policies, procedures, and values
• Any other reasonable duties as requested by management

Requirements

Required Experience and Qualities

• Experienced IT professional with a strong technical background and knowledge
• Proven experience of the following:

- Microsoft SQL Server versions 2005 through to 2016/2019

- SQL Server Administration

- SQL Server Integration Services

- SQL Server Reporting Services

- SQL Server Analysis Services

- All aspects of database schema: tables. indexes, triggers, stored procedures and functions

- All aspects of SQL DML: select, insert, update, delete

- All aspects of SQL DDL: create, alter, drop, truncate

- All aspects of SQL TCL: begin transaction, commit, rollback, savepoint

• Experience or the willingness to learn MariaDB/ MySQL
• Experience in or the ability to learn to develop applications/service using Visual Studio on a Windows platform.
• Ability to understand high level requirements and expand on them
• Ability to work with a high level of responsibility and autonomy
• Flexibility in terms of working time with a priority on delivering critical business initiatives within agreed timeframes
• A good team player

The above statements are intended to describe the general nature and level of work being performed by people assigned to this job. They are not intended to be an exhaustive list of all responsibilities, duties, and requirements.

Why work for us?
A career at Janus Henderson is more than a job, it's about investing in a brighter future together.
Our Mission at Janus Henderson is to help clients define and achieve superior financial outcomes through differentiated insights, disciplined investments, and world-class service. We will do this by protecting and growing our core business, amplifying our strengths and diversifying where we have the right.
Our Values are key to driving our success, and are at the heart of everything we do:
Clients Come First - Always | Execution Supersedes Intention | Together We Win | Diversity Improves Results | Truth Builds Trust
If our mission, values, and purpose align with your own, we would love to hear from you!
Your opportunity
+ As a Developer within the Operations and Regulatory Technology team you be responsible for designing, developing and maintaining software used to support Janus Henderson's Regulatory obligations.
+ To support the development of these applications you will be required to understand building of new cloud-based applications (Azure, Microsoft Stack, Angular), databases (Azure SQL Server, Snowflake), and supporting functionality to meet business stakeholder and regulatory requirements.
+ Using Agile project methodologies, you will work as part of a team to deliver change covering the full project Lifecyle from project initiation through to test execution and Go Live, adhering to product release delivery schedules working as a collaborative team member in an agile development environment.
+ This is a hands-on technical role where you will be required to research, design, develop, test, debug, document and support custom Regulatory applications in support of business needs.
+ Partnering with the Regulatory Reporting team as well as other impacted stakeholders, you will be instrumental in agreeing and implementing changes to our operating model to ensure we continue to meet our regulatory requirements. You will also be required to produce technical specifications and release notes for required features and architectural/framework improvements so excellent communication skills is a must.
+ You will actively participate in code design and code reviews with appropriate team members as well as requirements and design meetings.
+ You will need to ensure that all code adheres to vendor best practice and strict standards for accessibility, security, object-oriented practices and performance.
+ Carry out additional duties as assigned.
What to expect when you join our firm
+ Hybrid working and reasonable accommodations.
+ Generous Holiday policies.
+ Excellent Health and Wellbeing benefits including corporate membership to ClassPass.
+ Paid volunteer time to step away from your desk and into the community.
+ Support to grow through professional development courses, tuition/qualification reimbursement and more.
+ Maternal/paternal leave benefits and family services
+ Complimentary subscription to Headspace - the mindfulness app
+ All employee events including networking opportunities and social activities.
+ Lunch allowance for use within our subsidized onsite canteen
Must have skills
+ Experience in C# and Angular, solid understanding of OOP, and full-stack development including Azure DevOps
+ Experience in Azure including Functions, Resource Groups, Service Bus, Storage, and additional resource types
+ Proficiency in SQL across SQL Server and/or Snowflake to analyse, investigate, optimize data retrieval, and build out requirements as needed.
+ Understanding of data, specifically related to asset management regulatory and investment areas
+ Understanding of Agile delivery methodologies
+ Ability to design and deliver complex systems at scale
+ Excellent communication, presentation, influencing, and reasoning skills, demonstrating the ability to communicate information technology concepts to non-technology personnel
+ Problem solving / analysis - ability to understand complex issues and to then identify and effectively communicate solutions, taking ownership of the problem through to successful resolution
+ Experience of working in a global environment managing stakeholders across the globe
Nice to have skills
+ Databricks and Python development experience beneficial
+ Experience of micro-service development and API development
+ Craftsman-like approach to building software; takes pride in engineering excellence and instils these values in others
+ Demonstrable passion for technology e.g. personal projects, open-source involvement
+ Intellectually robust with a keenly analytic approach to problem solving
+ Self-organized with the ability to effectively manage time across multiple projects and with competing business demands and priorities
+ Focused on delivering value to the business with relentless efforts to improve process
+ Strong interpersonal skills; able to establish and maintain a close working relationship with team members and senior business stakeholders alike
+ Confident communicator: able to argue a point concisely and deal positively with conflicting views.
+ Ability to communicate information technology concepts to non-technology personnel
+ Problem ownership - takes responsibility for identified issues and works to resolve in a pragmatic manner
+ Client focused, committed to excellence, strong attention to detail and a team player
Supervisory responsibilities
+ No
Potential for growth
+ Mentoring
+ Leadership development programs
+ Regular training
+ Career development services
+ Continuing education courses
You will be expected to understand the regulatory obligations of the firm, and abide by the regulated entity requirements and JHI policies applicable for your role.
At Janus Henderson Investors we're committed to an inclusive and supportive environment. We believe diversity improves results and we welcome applications from candidates from all backgrounds. Don't worry if you don't think you tick every box, we still want to hear from you! We understand everyone has different commitments and while we can't accommodate every flexible working request we're happy to be asked about work flexibility and our hybrid working environment. If you need any reasonable accommodations during our recruitment process, please get in touch and let us know at
#LI-LN2 #LI-HYBRID
Janus Henderson (including its subsidiaries) will not maintain existing or sponsor new industry registrations or licenses where not supported by an employee's job functions (as determined by Janus Henderson at its sole discretion).
All applicants must be willing to comply with the provisions of Janus Henderson Investment Advisory Code of Ethics related to personal securities activities and other disclosure and certification requirements, including past political contributions and political activities. Applicants' past political contributions or activity may impact applicants' eligibility for this position. Janus Henderson is an equal opportunity /Affirmative Action employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status. All applications are subject to background checks.

An exciting opportunity has arisen for an experienced Software Developer to join a fast-growing team working at the forefront of the UK's net zero transition. You'll play a key role in developing software for smart solar-powered EV charging solutions, working across multiple technology stacks and contributing to the growth of innovative infrastructure.
 
The Software Developer will:

• Develop and maintain .NET applications for edge devices and cloud environments.
• Create dashboard components and CMS functionality in React.
• Optimise SQL performance and manage large datasets effectively.
• Manage and maintain cloud infrastructure in Microsoft Azure.
• Troubleshoot and debug code across multiple codebases and languages (C# and Typescript).
• Support operations and maintenance teams by building alerts, tools, and resolving technical issues.

 
The Software Developer will have:

• 6+ years' experience in software engineering with large-scale .NET codebases.
• Proficient in C#, React (Typescript, HTML, CSS), SQL, and Azure cloud environments.
• Strong understanding of software engineering practices and Agile methodologies.
• Experience in automated testing, debugging, and code review processes.
• Familiarity with protocols and technologies such as OCPP, OCPI, Modbus, and CANBus.
• Excellent communication and collaboration skills, with the ability to work in a fast-moving environment.

 
This is an excellent opportunity to apply your expertise to cutting-edge sustainable energy projects and help shape the future of EV charging infrastructure.
Apply now and take the next step in your career.

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