286 Backend Developer jobs in the United Kingdom

Job Title:Software Engineer( Backend Developer)
Location:London
Contract: 6 Months with potential extension (Inside IR35)
Commute- Max 2 days in office
Payrate : 63 - 84 Per Hour Inside IR35

About the Role

We are seeking a Software Engineer (Backend Developer) for the FinTech business unit of a leading global digital travel platform. This role involves building innovative regulatory technology solutions to ensure compliance and manage risks. The engineer will work on a mission-critical platform that uses state-of-the-art technology for sanctions screening and other regulatory processes. The position requires developing highly scalable distributed systems and micro-services that support business objectives and enhance the experience for partners and internal stakeholders

What You'll Do

• Design, build, and maintain scalable microservices that power our compliance platforms.
• Develop tools and systems for sanctions screening, transaction monitoring, and regulatory reporting.
• Optimize backend processes for performance, reliability, and data integrity.
• Enhance tooling, analytics, and reporting used by internal compliance stakeholders.
• Collaborate with cross-functional teams to understand regulatory processes and deliver technical solutions.
• Participate in on-call rotations, incident resolution, and continuous improvement initiatives.
• Contribute to hiring efforts and mentoring junior engineers.

What We're Looking For

• 5+ years of experience in software development with at least 2 server-side languages - Java being must have
• Proven experience with microservices architecture and scalable, distributed systems.
• Proficient in data technologies like MySQL , Hadoop , or Cassandra .
• Experience with batch processing , data pipelines , and data integrity practices.
• Familiarity with AWS services (e.g., RDS, Step Functions, EC2, Kinesis) is a plus.
• Solid understanding of unit , integration , and E2E testing paradigms.
• Prior experience in FinTech, Financial sector, Banking or Payment system.
• Awareness of security best practices (authentication, authorization).
• Experience with globally distributed teams is a plus.

This is an urgent vacancy where the hiring manager is shortlisting for an interview immediately. Please apply with a copy of your CV or send it khushboo. pandey @ randstad. Co. uk

Randstad Technologies is acting as an Employment Business in relation to this vacancy.

About Us

Earnly is a FinTech startup on a mission to simplify financial management and empower individuals and businesses with real-time clarity on their money. We’re developing a new platform that makes financial insights accessible, transparent, and stress-free. As an early member of our team, you’ll have the opportunity to directly shape the product, culture, and future of the company.

About You

You thrive in dynamic environments where no two days are the same, motivated by big goals and the satisfaction of building something meaningful from the ground up. Startups bring tight deadlines, shifting priorities, and lean resources, but you embrace the challenge, staying focused under pressure, taking ownership, adapting quickly, and pitching in wherever needed.

The Role

We’re looking for talented backend developer with proven commercial experience to help us build the core infrastructure that shall power our entire platform. You’ll be responsible for designing, developing, and maintaining secure, scalable APIs, data processing pipelines, and backend integrations with third-party services like Stripe, PayPal, and Open Banking providers.

Key Responsibilities:

• Build and maintain robust RESTful APIs for mobile and web clients.
li>Design and manage databases built in MongoDB and SQL Server to store, query, and aggregate user financial data.
• Develop data ingestion pipelines to process real-time and batch data from external services.
• Optimize backend performance and ensure application scalability and resilience.
• Build authentication and authorization flows, following best practices for fintech-grade security.
• Write unit and integration tests, participate in code reviews, and contribute to continuous improvement.
• Collaborate closely with frontend/mobile engineers, product managers, and founders in agile development cycles.
• Contribute to infrastructure decisions (e.g. Docker, container orchestration, cloud services).

Skills & Experience You’ll Need

< i>3+ years’ experience in backend development (ideally in a startup or SaaS environment). < i>Proficient in .Net, Core 8, Razor Pages and Bootstrap 5 for UI.
• Experience with databases such as MongoDB and SQL Server, including schema design, indexing, and performance tuning.
• Familiarity with cloud platforms like Azure (we use Azure).
• Experience with containerization tools (Docker, Docker Compose) and deployment pipelines.
• Strong understanding of API design, versioning, and security (OAuth, JWT, API tokens).
• Comfortable working with Git, agile methodologies, and CI/CD practices.
• A good understanding of data protection, GDPR, and fintech security requirements.

Nice to Have

• Exposure to event-driven architecture or message queues (e.g. Kafka).
• Experience integrating payment platforms like Stripe, PayPal, Plaid, or Open Banking.
• Exposure to Azure App Services.
• Knowledge of financial systems, accounting, or tax workflows.

What We Offer

• Equity within the business (granted after demonstrating ability and commitment)
• Remote & flexible working environment
• Training and development budget to support your growth
• The chance to join a FinTech startup at an early stage, where your input truly shapes the product and business

Requirements

• UK-based (remote OK), right to work in the UK.

Interested?

If you’re excited about building cutting-edge financial technology and want to be part of a growing startup, we’d love to hear from you. Click Apply Now!

Job Title:Software Engineer( Backend Developer)
Location:London
Contract: 6 Months with potential extension (Inside IR35)
Commute- Max 2 days in office
Payrate : 63 - 84 Per Hour Inside IR35

About the Role

We are seeking a Software Engineer (Backend Developer) for the FinTech business unit of a leading global digital travel platform. This role involves building innovative regulatory technology solutions to ensure compliance and manage risks. The engineer will work on a mission-critical platform that uses state-of-the-art technology for sanctions screening and other regulatory processes. The position requires developing highly scalable distributed systems and micro-services that support business objectives and enhance the experience for partners and internal stakeholders

What You'll Do

• Design, build, and maintain scalable microservices that power our compliance platforms.
• Develop tools and systems for sanctions screening, transaction monitoring, and regulatory reporting.
• Optimize backend processes for performance, reliability, and data integrity.
• Enhance tooling, analytics, and reporting used by internal compliance stakeholders.
• Collaborate with cross-functional teams to understand regulatory processes and deliver technical solutions.
• Participate in on-call rotations, incident resolution, and continuous improvement initiatives.
• Contribute to hiring efforts and mentoring junior engineers.

What We're Looking For

• 5+ years of experience in software development with at least 2 server-side languages - Java being must have
• Proven experience with microservices architecture and scalable, distributed systems.
• Proficient in data technologies like MySQL , Hadoop , or Cassandra .
• Experience with batch processing , data pipelines , and data integrity practices.
• Familiarity with AWS services (e.g., RDS, Step Functions, EC2, Kinesis) is a plus.
• Solid understanding of unit , integration , and E2E testing paradigms.
• Prior experience in FinTech, Financial sector, Banking or Payment system.
• Awareness of security best practices (authentication, authorization).
• Experience with globally distributed teams is a plus.

This is an urgent vacancy where the hiring manager is shortlisting for an interview immediately. Please apply with a copy of your CV or send it khushboo. pandey @ randstad. Co. uk

Randstad Technologies is acting as an Employment Business in relation to this vacancy.

SThree are pleased to announce we're recruiting for a talented Senior Java Backend Developer to join & guide our excellent team based in our fantastic office space located in 8 Bishopsgate, London.

SThree are building a new candidate digital experience to manage the interactions that candidates and contractors have with SThree. The first part of this journey is to build a contractor onboarding portal to streamline the process from a candidate placement to onboarded contractor. This will then be extended to provide functionality to manage active placements, such as timesheets and expenses.

This role will design, develop, test and support capabilities in our digital experience platform to create competitive advantage for SThree, as part of a small software development team.

About us

SThree is the global STEM-specialist talent partner that connects sought-after specialists in life sciences, technology, engineering and mathematics with innovative organisations across the world. We are the number one destination for talent in the best STEM markets: Recruiting highly skilled professionals and discovering life-changing jobs for the unsung heroes who will positively shape our future.

What are the day-to-day tasks?

• Hands-on design, development and testing of solutions, adhering to SThree's architectural principles, policies, and guidelines.
• Work with business stakeholders to understand opportunities and to design solutions that deliver the required outcomes.
• Work with other technology teams to design and deliver end-to-end capabilities.
• Integrate solutions with other systems in SThree's technology landscape, for example CRM and ERP systems.
• Provide support to users and resolve systems issues.
• Configure CICD pipelines to support continuous delivery.
• Maintain infrastructure-as-code to build environments and applications.
• Focus on automation across infrastructure, testing, deployment, operations, and security.
• Coach and mentor junior team members and promote knowledge sharing and collaboration across the team.

What skills and knowledge are we looking for?

• Extensive experience of building web applications on a Java technology stack.
• Experience of RESTful API design and implementation.
• Experience with test-driven development and test automation frameworks and tools.
• Experience of configuring CICD pipelines to support continuous delivery.
• Experience with infrastructure-as-code technologies such as Terraform.
• Experience of working in Agile software development teams and across the full software development lifecycle.
• Previous experience of building solutions using Liferay DXP would be beneficial.
• Good understanding of Azure Integration Services (API Management, Service Bus, Event Hub).
• Good understanding of Microsoft Identity Management solutions (Azure AD, Azure AD B2C).
• Good understanding of cloud computing architectures and fundamentals like security, performance, and scalability, with experience of working with cloud technologies in Azure.

Benefits for our U.K. teams include:

• The choice to work flexibly from home and the office, in line with our hybrid working principles
• Bonus linked to company and personal performance
• Generous 28 days holiday allowance, plus public holidays
• Annual leave purchase scheme
• Five days paid Caregiver/Dependant leave per annum
• Five paid days off per year for volunteering `
• Private healthcare, discounted dental insurance and health care cashback scheme
• Opportunity to participate in the company share scheme
• Access to a range of retail discounts and saving

What we stand for.

We're committed to ensuring for our colleagues, candidates and communities, that all processes are equitable, and everyone is treated with fairness and dignity where everyone belongs, is valued and is connected. If you need any assistance or reasonable adjustments in submitting your application, please let us know, and we'll be happy to help.

What we stand for.

We create community and deliver change that transforms the future for everyone. With this in mind, we're committed to ensuring for our colleagues, candidates and communities, that all processes are equitable and everyone is treated with fairness and dignity where everyone belongs, is valued and is connected.

If you need any assistance or reasonable adjustments in submitting your application, please let us know, and we'll be happy to help.

Principal .Net Developer – SaaS Company – Greater Manchester

Salary: £70,000 to £80,000 + Benefits
Location: Manchester

Xpertise Recruitment are looking for a Principal .Net Developer to join a well-established and fast-growing SaaS business in Manchester.

This company has built a high-performing engineering team and a strong reputation for delivering scalable, user-centric software used by over a million users worldwide. They offer a modern tech environment, exciting product challenges, and a brilliant culture that supports learning, collaboration, and technical leadership.

Strategic technical leadership: You’ll play a key role in shaping the engineering direction of a product suite used globally. As a Principal Developer, you’ll help define architectural decisions, mentor senior developers, and guide best practices across multiple teams.

Supportive engineering culture: You’ll be surrounded by experienced engineers who value collaboration, clean code, and continuous improvement. There’s a strong sense of ownership and shared responsibility when tackling complex challenges.

Modern, cloud-based tech: You’ll work hands-on with the latest technologies including .Net 8 , C# , Azure , and infrastructure-as-code with Terraform . There’s a strong DevOps culture, and the environment encourages experimentation and innovation.

Agile, cross-functional teams: Product delivery is built around agile principles, iterative development, and real user feedback across the UK and international markets.

Low staff turnover: Engineers stay long term thanks to the positive culture, leadership support, and clear opportunities for personal and technical progression.

Tech-first mindset: The engineering team prioritises clean, test-driven code, continuous deployment, and automation. You’ll have the chance to help drive improvements to performance, scalability, and overall software design.

This is an opportunity to take the next step in your career as a hands-on technical leader working on meaningful software, influencing architectural decisions, and supporting the growth of a high-performing engineering team.

Please apply with your CV, and we’ll set up an informal call to talk through the role, tech, and team in more detail.

Senior Backend Developer

Capital Pay Software Solutions Ltd

• Promoting world class payment solution systems to global audiences
li>Capital Pay Software Solutions Ltd is advancing its capabilities by enhancing its Payment Aggregator Platform.  li>This strategic initiative is crucial to our international operations, designed for optimal flexibility and adaptability across diverse markets. We are seeking highly skilled and motivated professionals to strengthen our expert team. If you excel in a dynamic environment and are dedicated to developing secure and scalable FinTech solutions, we encourage you to connect with us. Join Capital Pay International in driving innovation in the global payment landscape.
•  

Key Responsibilities:

• Lead the design and development of the core backend architecture, including the API gateway, transaction management layer, and merchant management layer.
• Select and implement appropriate technologies from our stack, which includes python, Node.js, or Jave for programming languages; Django, Express.js, or Spring Boot for frameworks; and PostgreSQL or MySQL for transactional date, with Redis for caching and session management.
• Design and implement robust security measures, including AES-256 encryption for sensitive data, TLS for secure communication, and OAuth/JWT for authentication and authorisation.
• Ensure the platform is compliant with PCI-DSS, GDPR, and other relevant data protection regulations.
• Integrate multiple payment gateways (Capital Pay, Stripe, Paypal, Barclaycard, Adyen, Worldpay) using provided SDKs/APIs.
li>Implement advanced fraud detection and anti-mney laundering (AML) systems.
• Develop and maintain RESTful APIs for seamless communication with the frontend and external systems.
li>Implement features for transaction tracking and status management (pending, completed, failed), refund and chargeback handling, and payment settlement (funds transfer to merchant accounts).
• Participate in architectural design discussions, code reviews, and technical mentoring.
• Contribute to the development of a developer-friendly API and comprehensive documentation.
• Set up and manage cloud infrastructure on AWS, Google Cloud, or Azure.
• Implement and manage continuous integration and continuous delivery (CI/CD) pipelines to automate software builds and deployments

We are looking for a candidate who:
• Has a proven track record of 6+ years in backend development, with significant experience in the FinTech or financial services sector.
• Possesses deep expertise in building scalable and secure backend services.
• Is proficient in at least one of the specified programming languages (Python, Node.js, Kotlin or Java) and their associated frameworks.
• Has a strong experience with database design and management, including both SQL (PostgreSQL or MySQL) and potentially NoSQL databases.
• Has hands-on experience with RESTful API design and microservices architecture.
• Demonstrates a strong understanding of security best practices and compliance standards like PCIDSS and GDPR.
• Has experience integrating with third-party APIs, particularly payment gateways.
• Has experience in NFC/RFID technology and Payment Networks integrations.
• Is adept at problem-solving, has excellent attnetion to detail, and can work effectively in a fast-paced,agile environment.
• Familiarity with serverless architecture is beneficial.
• Experience with messaging systems like RabbitMQ or Kafka is a plus.
• Experience implementing two-factor authentication (2FA) for user logins.
• Experience with performance optimisation for high-traffic scenarios and a large number of concurrent users.

Senior .Net Developer – SaaS Company – Greater Manchester

Salary: £55,000 to £65,000 + Benefits

Location: Manchester – Most on-site

Xpertise Recruitment are looking for a Senior .Net Developer to join a well-established and fast-growing SaaS business in Manchester.

This company has built a high-performing engineering team and a strong reputation for delivering scalable, user-centric software used by over a million users worldwide. They offer a modern tech environment, exciting product challenges, and a brilliant culture that supports learning, collaboration, and progression.

• Supportive engineering culture: You’ll be surrounded by great people who enjoy solving complex technical challenges together. There’s a real sense of togetherness and shared ownership when approaching problems.

• Career development: Whether you're aiming to deepen your technical expertise or grow into leadership, you’ll be supported every step of the way with structured development paths and regular mentorship.

• Modern, cloud-based tech: You’ll work with the latest technologies including .Net 8 , C# , Azure  and infrastructure-as-code using Terraform.

• Agile, cross-functional teams: Their product delivery model is built around agile, iterative development with a focus on delivering real value to users not just in the UK, but internationally.

• Hybrid working with great office space: The office is ideal for in-person collaboration, architecture planning, and team socials, but you’ll have the flexibility to work from home. 

• Low staff turnover: People tend to stay for the long haul due to the positive working environment, leadership support, and shared mission.

• A tech-driven environment: This is a workplace that values test-driven code. You’ll be part of a team that practices DevOps principles and embraces a learning culture.

This is a brilliant opportunity to make an impact at a SaaS company that values its people and is continuing to grow. You’ll work with modern tech, a smart and collaborative team, and have the tools and support you need to progress.

Interested?
Please apply with your CV, and we’ll set up an informal call to talk through the role, tech, and team in more detail.

The Opportunity

We're looking for a talented Senior Backend Developer to join a purpose-driven tech team that creates solutions making a real difference in people's lives. This is more than just a job, it's a chance to shape systems that support individuals and organisations across the UK and Ireland.

The Role

As a Senior Backend Developer, you'll be a founding member of a newly formed cross-functional engineering team. You'll play a key role in setting the tone for the team's culture, practices, and success. Your technical expertise will shape our architecture and support business-critical applications.

This is a highly collaborative role suited to someone with a passion for software craftsmanship and continuous improvement.

Key Responsibilities

• Enhance features and functionality of core products
• Design and implement scalable backend systems using C# (.NET 5+ preferred)
• Write clean, maintainable, and testable code using TDD/BDD principles
• Create and maintain RESTful and GraphQL APIs
• Collaborate with POs, BAs, and stakeholders to define solutions
• Mentor junior developers and promote best practices
• Drive improvements in development processes and tools

What You Bring

• 5+ years of backend development experience
• Expertise in C#, .NET (preferably .NET 6+), and SQL Server
• Deep understanding of SOLID and OOP principles
• Skilled in Git, Unit Testing (NUnit), and API development
• Familiarity with CI/CD pipelines and agile methodologies
• Strong communication and problem-solving skills
• Desire to grow within a dynamic and evolving team

Why Join?

This is an incredible opportunity to make your mark in a company that prioritises purpose, innovation, and professional growth. You'll be part of a team where your ideas are welcomed, your development is encouraged, and your work truly matters.

Ready to build something that helps others-and builds your career in the process? Apply today.

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