809 Api Developer jobs in the United Kingdom
Senior Backend Developer
Posted 2 days ago
Job Viewed
Job Description
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.
48954MS
INDMANS
Axway API Developer
Posted 2 days ago
Job Viewed
Job Description
Axway API Developer
+ 6 month initial contract
+ Full remote
+ 650 to 690 per day
+ SC Cleared role
Key Skills:
+ Axway API Development/Administration
+ SC Clearance
Responsibilities
Designing, developing and deploying of Axway policies and containers using Axway Policy Studio v7.7
Working with DevOps toolset for develop and maintain Automated Testing and Code Deployment
Provide Assistance to Axway support team to resolve technical issues
Administrating the Axway Environment, using Axway Policy Studio, Axway API Manager, Cassandra and API Gateway for Deployment of Axway Patches, monitor capacity, providing service improvements
Liaise with customers to define project requirements, document and design solutions
Knowledge of:
- SFTP
- HTTPS
- SSL/TLS
- oAuth
- JSON
- XML
- SOAP
- REST
- Mime
- Linux Scripting
Axway API Developer
Posted 6 days ago
Job Viewed
Job Description
Axway API Developer (SC Cleared)
? 6 months contract Inside IR35
? £500 to £650 a day
?Remote Working (UK based)
*Active SC Clearance is needed*
A top-tier defense organization is looking for an experienced Axway API Developer / Administrator to join their team on a 6-month contract. You will contribute to a large government gateway project, and active SC clearance is required.
The main focus of .
Senior PHP Developer - REST API
Posted 22 days ago
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Job Description
NO AGENCIES - Please do not attempt to canvas from here
We are a highly successful UK-based Events Management SaaS company looking for an ambitious PHP Technology/Software Architect to help oversee the next phase of development of our suite of products. As an accomplished PHP Senior Engineer you will have a solid track record of designing highly scalable technology platforms.
We are gearing up for the next stage of our journey and invite you to discuss how we can collaborate whilst supporting your personal growth.
Role Info:
Current Tech Includes: PHP, MySQL, Laravel
Methodologies: Agile/Kanban, TDD/BDD, Continuous integration and Delivery.
Who we are:
With an existing and highly satisfied customer base of very well-known large international blue chip enterprises, we are a secure and dynamically growing Software business with a 20-year history of stability and profit from offices in Farringdon, London. The next few years will be an exciting time for the company as we focus on investment led growth that will be targeting both our production and sales teams. Our client list includes the likes of Deutsche
.NET Core API Developer - III (Remote)
Posted 21 days ago
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Job Description
DivIHN (pronounced “divine”) is a CMMI ML3-certified Technology and Talent solutions firm. Driven by a unique Purpose, Culture, and Value Delivery Model, we enable meaningful connections between talented professionals and forward-thinking organizations. Since our formation in 2002, organizations across commercial and public sectors have been trusting us to help build their teams with exceptional temporary and permanent talent.
Visit us at to learn more and view our open positions.
For further inquiries regarding the following opportunity, please contact our Talent Specialists: Ragu Mohan at Nithiya at Title: .NET Core API Developer - III (Remote) Duration: 12 Months Location: Remote Remote, but must be able to work Central time zone, 8am-4pm CST. Description This role involves performing standard software engineering work as part of a team, applying standard engineering techniques, procedures, and criteria as part of the software development lifecycle (SDLC). The work is closely supervised. Primary Responsibilities 1. Application Development • Develop software applications using C# and .NET Core API. Write unit tests using X/NUnit and AutoFixture to ensure application quality and reliability. • Debug and troubleshoot application issues to ensure timely resolution. . Data Access and Integration • Develop data access layers using Core API and OData to expose data as a service. Integrate data sources using ETL (Extract, Transform, Load) processes. • Use AutoMapper to map data between different data models and formats. . Documentation and Collaboration • Document application design, development, and testing processes. Collaborate with cross-functional teams to ensure data consistency and integrity. • Participate in technical reviews and provide feedback on application design and development. . Technical Support and Design Improvement • Investigate and analyze technical support issues related to .NET Core API and data access layers. Recommend design improvements to enhance application performance and data integrity. 5. Database Design and Development • Design, develop, and maintain MySQL databases to support software applications. Create database schema, tables, and relationships to ensure data integrity and performance. • Write complex SQL queries and stored procedures to optimize database performance. Essential Requirements 1. .NET Core API Expertise • Advanced knowledge of .NET Core API and experience with frameworks such as ASP.NET Core. Experience with .NET Core API development, including API design, implementation, and testing. 2. Software Engineering Principles and Procedures • Knowledge of the principles and procedures of software engineering (e.g., IEC 62304, CMMI, Agile). Experience with software development methodologies, including Agile and Scrum. 3. MySQL Expertise • Advanced knowledge of MySQL database management systems, including database design, schema creation, and query/function writing. Experience with MySQL clustering, replication, and high availability. 4. Communication and Teamwork • Ability to discuss normally encountered technical or project management issues, both verbally and in written form. Ability to work as a collaborative team member. 5. Problem-Solving • Ability to solve complex design and engineering problems with minimal assistance. Experience debugging and troubleshooting techniques to resolve application issues. Desired Skills 1. OData • Practical experience with OData (Open Data Protocol) for exposing data as a service. Knowledge of OData protocol and its implementation in .NET Core API. 2. .NET Core API • Knowledge of .NET Core API and experience with frameworks such as ASP.NET Core. Experience with .NET Core API development, including API design, implementation, and testing. 3. AutoMapper • Familiarity with AutoMapper and experience with its usage in .NET applications. Knowledge of AutoMapper configuration and mapping techniques. 4. Autofac • Experience with Autofac for managing dependencies and resolving objects in complex applications. Knowledge of Autofac configuration and usage in .NET applications. 5. X/NUnit + AutoFixture • Practical experience with X/NUnit for writing and executing unit tests. Practical experience with AutoFixture for writing and executing unit tests. Education and Experience • B.S. in Computer Science, Computer Engineering, Electrical Engineering, Software Engineering, or related field 3-5 years related experience
DivIHN is an equal opportunity employer. DivIHN does not and shall not discriminate against any employee or qualified applicant on the basis of race, color, religion (creed), gender, gender expression, age, national origin (ancestry), disability, marital status, sexual orientation, or military status.
API Gateway Developer
Posted 12 days ago
Job Viewed
Job Description
br>Location: Buffalo, New York
Job Summary:
We are seeking a highly motivated API Gateway Developer to join our Integration and Middleware Team. The ideal candidate will be responsible for designing, developing, and maintaining API solutions using Axway API Gateway and Axway API Manager. This role requires hands-on experience in API development, integration patterns, and securing enterprise APIs.
Key Responsibilities:
10+ years of relevant experience in API development and integration.
efine system and product requirements and generate software/hardware performance and reliability specifications.
Lead evaluation, design, and integration of enhancements or new system releases.
Enhance processes, procedures, and policies related to system performance.
Collaborate with management teams and vendors on planning, upgrading, testing, and securing IT solutions.
Design and implement architecturally compliant system landscapes.
Develop, test, implement, document, and maintain systems software and hardware.
Troubleshoot and resolve server, operating system, and infrastructure issues.
Monitor systems and networks for errors, malfunctions, and security threats.
Prepare network analytics, data reports, and operational manuals.
Manage project timelines, budgets, and related documentation.
Train engineering teams on new systems, protocols, and best practices.
Required Technical Skills:
Proven experience with API Gateways such as Axway, AWS, or equivalent platforms, including global deployments.
Strong understanding of API security mechanisms and ability to develop and execute security remediation plans.
Ability to advise application teams on building APIs aligned with architectural and security standards.
Strong knowledge of REST and SOAP service paradigms, WSDL, and Swagger validation.
Experience with Visual Studio / Visual Studio Code and integrated development environments.
Expertise in HTTP/S, web services, and microservices architecture.
Proficiency with version control tools (e.g., Git) and CI/CD practices.
Ability to monitor API traffic and troubleshoot performance, security, and availability issues.
Hands-on experience in creating API proxies, routing rules, filters, and custom policies.
Familiarity with high availability (HA) strategies for system implementation.
Soft Skills:
Excellent problem-solving and analytical abilities.
Strong communication and documentation skills.
Ability to work independently and in cross-functional teams.
Education:
Bachelor’s degree in Computer Science, Engineering, Mathematics, Statistics, or a related quantitative field. < r>
If interested please share your resume @
Senior Software Developer API
Posted 2 days ago
Job Viewed
Job Description
We are looking for a Senior Software Developer to join the Frontier team, on a permanent, full-time basis. This is a fully homebased role but there will be a requirement to attend sites when needed.
You are an experienced developer who seeks simplicity of solutions and excellence in code. You are able to lead the work of less experienced developers (at entry and intermediate level), drive standards.
WHJS1_UKTJ
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Senior Java Developer API Security
Posted 1 day ago
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Job Description
Senior Java Developer / Backend Software Engineer Cambridge / WFH to £75k
Are you a backend focussed Java technologist?
You could be progressing your career in a senior, hands-on role at a market leading software house that's remote access product is used by hundreds of millions of users worldwide.
As a Senior Java Developer you will design and develop new features and enhancements to the cloud based.
WHJS1_UKTJ
Lead Python Developer, Backend Developer, GCP, Flask,API
Posted 2 days ago
Job Viewed
Job Description
2 days on site in North London
3 days remote
I am recruting for a talented and driven Backend Engineer to join a dynamic team, focused on the creation and deployment of innovative software solutions. As a Backend Engineer, you will work closely with cross-functional teams, including engineering, product management, design, and quality assurance, to develop cutting-edge features that power our platform.
Key Responsibilities:
Collaborate with cross-functional teams : Contribute to the development of new features by working alongside engineering, product management, design, and QA teams.
Promote best practices : Advocate and enforce coding standards, architectural patterns, and best practices. Your in-depth knowledge of backend technologies will help guide and support your peers, ensuring high-quality code.
Automation and process improvement : Increase development efficiency, reliability, and scalability by creating automated processes that streamline workflows.
Foster engineering excellence : Promote engineering best practices across the team and inspire your peers to improve their skills and capabilities.
Knowledge sharing : Actively engage with the engineering community, contributing to knowledge-sharing initiatives and events. Share your expertise to motivate and mentor your team.
Required Skills:
Proven experience designing and building REST APIs (ideally with Flask, FastAPI, or similar frameworks).
Expertise in designing architectures that meet scalability, reliability, and security goals.
Strong problem-solving skills, particularly in product development.
Solid understanding of backend best practices, coding standards, and architectural patterns.
Experience in automating builds (CI/CD), feature flags, and automated testing.
Bonus Skills:
Experience with message-driven systems (e.g., Google Pub/Sub).
Proficiency in relational databases (RDBMS), particularly with Postgres.
Familiarity with NoSQL databases (document store/key-value store) is a plus.
Experience with containerization technologies (Docker, Kubernetes).
Hands-on experience with Google Cloud Platform (GCP) and configuration management (ideally using Terraform).
Familiarity with Google Cloud Build for CI/CD actions, deployments, and builds.
People Source Consulting Ltd is acting as an Employment Agency in relation to this vacancy. People Source specialise in technology recruitment across niche markets including Information Technology, Digital TV, Digital Marketing, Project and Programme Management, SAP, Digital and Consumer Electronics, Air Traffic Management, Management Consultancy, Business Intelligence, Manufacturing, Telecoms, Public Sector, Healthcare, Finance and Oil & Gas.
Lead Python Developer, Backend Developer, GCP, Flask,API
Posted 2 days ago
Job Viewed
Job Description
2 days on site in North London
3 days remote
I am recruting for a talented and driven Backend Engineer to join a dynamic team, focused on the creation and deployment of innovative software solutions. As a Backend Engineer, you will work closely with cross-functional teams, including engineering, product management, design, and quality assurance, to develop cutting-edge features that power our platform.
Key Responsibilities:
Collaborate with cross-functional teams : Contribute to the development of new features by working alongside engineering, product management, design, and QA teams.
Promote best practices : Advocate and enforce coding standards, architectural patterns, and best practices. Your in-depth knowledge of backend technologies will help guide and support your peers, ensuring high-quality code.
Automation and process improvement : Increase development efficiency, reliability, and scalability by creating automated processes that streamline workflows.
Foster engineering excellence : Promote engineering best practices across the team and inspire your peers to improve their skills and capabilities.
Knowledge sharing : Actively engage with the engineering community, contributing to knowledge-sharing initiatives and events. Share your expertise to motivate and mentor your team.
Required Skills:
Proven experience designing and building REST APIs (ideally with Flask, FastAPI, or similar frameworks).
Expertise in designing architectures that meet scalability, reliability, and security goals.
Strong problem-solving skills, particularly in product development.
Solid understanding of backend best practices, coding standards, and architectural patterns.
Experience in automating builds (CI/CD), feature flags, and automated testing.
Bonus Skills:
Experience with message-driven systems (e.g., Google Pub/Sub).
Proficiency in relational databases (RDBMS), particularly with Postgres.
Familiarity with NoSQL databases (document store/key-value store) is a plus.
Experience with containerization technologies (Docker, Kubernetes).
Hands-on experience with Google Cloud Platform (GCP) and configuration management (ideally using Terraform).
Familiarity with Google Cloud Build for CI/CD actions, deployments, and builds.
People Source Consulting Ltd is acting as an Employment Agency in relation to this vacancy. People Source specialise in technology recruitment across niche markets including Information Technology, Digital TV, Digital Marketing, Project and Programme Management, SAP, Digital and Consumer Electronics, Air Traffic Management, Management Consultancy, Business Intelligence, Manufacturing, Telecoms, Public Sector, Healthcare, Finance and Oil & Gas.