API Development Job Vacancies

251 to 275 of 397 API Development Jobs

Python Software Engineer, Python, AWS | Python, TDD & BDD, Monitoring | Household Name | £650 - 750pd Outside IR35 | 6-month contract | Fully Remote (UK)

Altrincham, Greater Manchester, United Kingdom
Hybrid / WFH Options
Owen Thomas | Pending B Corp™
maintainability. Core Skills for the Python Software Engineer, Python, AWS | Python, TDD & BDD, Monitoring | £650 - 750pd Outside IR35 | 6-month contract | Fully Remote (UK) Strong Python expertise, especially for API development and testing in cloud environments (preferably AWS). Solid experience with cloud platforms (AWS, Azure, GCP), containerisation, automation, and orchestration tools.Familiar with CI/CD pipelines and More ❯
Posted:

Python Software Engineer, Python, AWS | Python, TDD & BDD, Monitoring | Household Name | £650 - 750pd Outside IR35 | 6-month contract | Fully Remote (UK)

Leigh, Greater Manchester, United Kingdom
Hybrid / WFH Options
Owen Thomas | Pending B Corp™
maintainability. Core Skills for the Python Software Engineer, Python, AWS | Python, TDD & BDD, Monitoring | £650 - 750pd Outside IR35 | 6-month contract | Fully Remote (UK) Strong Python expertise, especially for API development and testing in cloud environments (preferably AWS). Solid experience with cloud platforms (AWS, Azure, GCP), containerisation, automation, and orchestration tools.Familiar with CI/CD pipelines and More ❯
Posted:

Python Software Engineer, Python, AWS | Python, TDD & BDD, Monitoring | Household Name | £650 - 750pd Outside IR35 | 6-month contract | Fully Remote (UK)

Leeds, West Yorkshire, United Kingdom
Hybrid / WFH Options
Owen Thomas | Pending B Corp™
maintainability. Core Skills for the Python Software Engineer, Python, AWS | Python, TDD & BDD, Monitoring | £650 - 750pd Outside IR35 | 6-month contract | Fully Remote (UK) Strong Python expertise, especially for API development and testing in cloud environments (preferably AWS). Solid experience with cloud platforms (AWS, Azure, GCP), containerisation, automation, and orchestration tools.Familiar with CI/CD pipelines and More ❯
Posted:

Python Software Engineer, Python, AWS | Python, TDD & BDD, Monitoring | Household Name | £650 - 750pd Outside IR35 | 6-month contract | Fully Remote (UK)

Bury, Greater Manchester, United Kingdom
Hybrid / WFH Options
Owen Thomas | Pending B Corp™
maintainability. Core Skills for the Python Software Engineer, Python, AWS | Python, TDD & BDD, Monitoring | £650 - 750pd Outside IR35 | 6-month contract | Fully Remote (UK) Strong Python expertise, especially for API development and testing in cloud environments (preferably AWS). Solid experience with cloud platforms (AWS, Azure, GCP), containerisation, automation, and orchestration tools.Familiar with CI/CD pipelines and More ❯
Posted:

Python Software Engineer, Python, AWS | Python, TDD & BDD, Monitoring | Household Name | £650 - 750pd Outside IR35 | 6-month contract | Fully Remote (UK)

Bolton, Greater Manchester, United Kingdom
Hybrid / WFH Options
Owen Thomas | Pending B Corp™
maintainability. Core Skills for the Python Software Engineer, Python, AWS | Python, TDD & BDD, Monitoring | £650 - 750pd Outside IR35 | 6-month contract | Fully Remote (UK) Strong Python expertise, especially for API development and testing in cloud environments (preferably AWS). Solid experience with cloud platforms (AWS, Azure, GCP), containerisation, automation, and orchestration tools.Familiar with CI/CD pipelines and More ❯
Posted:

Python Software Engineer, Python, AWS | Python, TDD & BDD, Monitoring | Household Name | £650 - 750pd Outside IR35 | 6-month contract | Fully Remote (UK)

Central London / West End, London, United Kingdom
Hybrid / WFH Options
Owen Thomas | Pending B Corp™
maintainability. Core Skills for the Python Software Engineer, Python, AWS | Python, TDD & BDD, Monitoring | £650 - 750pd Outside IR35 | 6-month contract | Fully Remote (UK) Strong Python expertise, especially for API development and testing in cloud environments (preferably AWS). Solid experience with cloud platforms (AWS, Azure, GCP), containerisation, automation, and orchestration tools.Familiar with CI/CD pipelines and More ❯
Posted:

Python Software Engineer, Python, AWS | Python, TDD & BDD, Monitoring | Household Name | £650 - 750pd Outside IR35 | 6-month contract | Fully Remote (UK)

Ashton-Under-Lyne, Greater Manchester, United Kingdom
Hybrid / WFH Options
Owen Thomas | Pending B Corp™
maintainability. Core Skills for the Python Software Engineer, Python, AWS | Python, TDD & BDD, Monitoring | £650 - 750pd Outside IR35 | 6-month contract | Fully Remote (UK) Strong Python expertise, especially for API development and testing in cloud environments (preferably AWS). Solid experience with cloud platforms (AWS, Azure, GCP), containerisation, automation, and orchestration tools.Familiar with CI/CD pipelines and More ❯
Posted:

Software Engineer $245,000.00 with Security Clearance

Fairfax, Virginia, United States
Anonymous Employer
experience working with Apache NiFi. 6. (Mandatory) Demonstrated professional experience working with large data and high performance compute clusters such as Hadoop or similar. 7. (Mandatory) Demonstrated experience with API development techniques. 8. (Mandatory) Demonstrated experience developing and deploying ETL processes for large data sets. 9. (Mandatory) Demonstrated experience creating operating system level scripts to perform ETL operations … on SQL databases. 10. (Mandatory) Demonstrated professional experience with version control systems, preferably Git. 11. (Mandatory) Demonstrated experience testing the development of software solutions for the extraction, transformation, and loading of data using the most efficient languages for the task such as NiFi, Python, and SQL. 12. (Mandatory) Demonstrated experience implementing multiprocessing data-flows to parallelize ingest operations. Optional More ❯
Employment Type: Permanent
Salary: USD 245,000 Annual
Posted:

Linux System Administrator

Sheffield, UK
Cognizant
knowledge of VMware, VirtualBox, or other virtualization technologies including hypervisor-level configurations. Networking Knowledge: Solid understanding of networking fundamentals, especially TCP/IP protocols, port management, and firewall configurations. API Development & Testing: Experience in developing REST APIs and performing integration using tools such as MuleSoft or Postman. Configuration Management: Capable of developing and integrating Ansible playbooks for automated More ❯
Posted:

Senior ML Engineer, AWS Generative AI Innovation Center

London, United Kingdom
Amazon
and deploying large-scale machine learning or deep learning models and/or systems into production, including batch and real-time data processing, model containerization, CI/CD pipelines, API development, model training, and productionizing ML models. Experience contributing to the architecture and design (architecture, design patterns, reliability, and scaling) of new and current systems. PREFERRED QUALIFICATIONS Masters More ❯
Employment Type: Permanent
Salary: GBP Annual
Posted:

OnBase Systems Analyst

Sandusky, Ohio, United States
Civista Bank
Civista Bank Description: Position Description: Civista Bank is looking for a senior comprehensive analytical tactician with a broad scope of technical expertise to be our OnBase Systems Analyst. This position requires an advanced working knowledge of Hyland's OnBase Document More ❯
Employment Type: Permanent
Salary: USD Annual
Posted:

JavaScript/TypeScript API Integration

Manchester, UK
iO Associates - UK/EU
JavaScript/TypeScript API Engineer Contract Length: 6 Months Location: Manchester (1 Day a week in Manchester City Centre Office) Rate: Outside IR35 £350 - £400 per day *Immediate Start* Join a fast-moving product consultancy delivering high-impact software for a broad mix of clients across a range of sectors. They're now looking for an experienced contractor to … support a critical project focused on API development and complex system integration. The Role: You'll be part of a small, highly cooperative engineering team working on a SaaS platform designed to streamline and automate operational workflows. The focus is on building out and refining backend APIs, integrating third-party services, and improving the overall scalability and reliability … of the system. Tech Stack: TypeScript & JavaScript Node.js with Express n8n (workflow and automation integrations) PostgreSQL Permit.io (RBAC and auth) API best practices (rate limiting, downstream integrations) GraphQL (mostly migrating from) Day-to-Day Responsibilities: Contribute to backend development and API design using TypeScript Work on system integrations using n8n and other tools Collaborate on migrating from More ❯
Posted:

JavaScript/TypeScript API Integration

Manchester, Lancashire, United Kingdom
iO Associates
JavaScript/TypeScript API Engineer Contract Length: 6 Months Location: Manchester (1 Day a week in Manchester City Centre Office) Rate: Outside IR35 £350 - £400 per day Immediate Start Join a fast-moving product consultancy delivering high-impact software for a broad mix of clients across a range of sectors. They're now looking for an experienced contractor to … support a critical project focused on API development and complex system integration. The Role: You'll be part of a small, highly cooperative engineering team working on a SaaS platform designed to streamline and automate operational workflows. The focus is on building out and refining backend APIs, integrating third-party services, and improving the overall scalability and reliability … of the system. Tech Stack: TypeScript & JavaScript Node.js with Express n8n (workflow and automation integrations) PostgreSQL Permit.io (RBAC and auth) API best practices (rate limiting, downstream HTTP integrations) GraphQL (mostly migrating from) Day-to-Day Responsibilities: Contribute to backend development and API design using TypeScript Work on system integrations using n8n and other tools Collaborate on migrating More ❯
Employment Type: Permanent
Salary: GBP Annual
Posted:

C#.Net Core, MicroServices, API engineer | FX Trading - Greenfield Digital Data Build | £65,000 + strong bonus | Hybrid

London, UK
Hybrid / WFH Options
VirtueTech Recruitment Group
C#.Net Core, MicroServices, API engineer | FX Trading - Greenfield Digital Data Build | £65,000 + strong bonus | Hybrid C#.Net Core engineer, with experience building microservice based applications, needed for a FX trading house. As a C#.net Core engineer, you will get the opportunity to work in the Front Office, building bespoke C#.Net Core applications, providing a wide range of solutions. … providing services for the last 25 years and have grown year on year. They are looking for bright and enthusiastic C#.net developers to help support the growth of their development function. Their C#.net software products are used by their own in-house service team who use the software to help them provide services to their customers offering a wide … the office 4/5 days per week. The office is based close to Old Street Station, London. Experience needed Proficient in C# and .NET Core Experienced with Web API development Developing, deploying, and maintaining microservices Experience in developing containerized microservice architectures using technologies like Docker and Kubernetes Skilled in designing and developing microservices If you would like More ❯
Posted:

C#.Net Core, MicroServices, API engineer | FX Trading - Greenfield Digital Data Build | £65,000 + strong bonus | Hybrid

City of London, Greater London, UK
Hybrid / WFH Options
VirtueTech Recruitment Group
C#.Net Core, MicroServices, API engineer | FX Trading - Greenfield Digital Data Build | £65,000 + strong bonus | Hybrid C#.Net Core engineer, with experience building microservice based applications, needed for a FX trading house. As a C#.net Core engineer, you will get the opportunity to work in the Front Office, building bespoke C#.Net Core applications, providing a wide range of solutions. … providing services for the last 25 years and have grown year on year. They are looking for bright and enthusiastic C#.net developers to help support the growth of their development function. Their C#.net software products are used by their own in-house service team who use the software to help them provide services to their customers offering a wide … the office 4/5 days per week. The office is based close to Old Street Station, London. Experience needed Proficient in C# and .NET Core Experienced with Web API development Developing, deploying, and maintaining microservices Experience in developing containerized microservice architectures using technologies like Docker and Kubernetes Skilled in designing and developing microservices If you would like More ❯
Posted:

Java API Developer

Great Houghton, Northamptonshire, United Kingdom
Barclays Bank PLC
Join us as an experienced Java API Developer at Barclays, where you will be making significant contributions to critical and challenging projects at the core of high profile customer data related initiatives. You will be joining a highly skilled and experienced team who specialise in data quality subject matter providing essential software engineering and analytical services to progress mission … role offers an opportunity to hone existing expertise as well as acquire broader skills and experience. To be successful in this role, you should have: Solid experience with Java development and engineering APIs as well as integrating them into a complex business environment. Experience with MongoDB (preferably) or other database technologies. Strong communication skills both written and verbal. Some … Knutsford office. Purpose of the role To design, develop and improve software, utilising various engineering methodologies, that provides business, platform, and technology capabilities for our customers and colleagues. Accountabilities Development and delivery of high-quality software solutions by using industry aligned programming languages, frameworks, and tools. Ensuring that code is scalable, maintainable, and optimized for performance. Cross-functional collaboration More ❯
Employment Type: Permanent
Salary: GBP Annual
Posted:

Senior Software Engineer with Security Clearance

Clarksburg, West Virginia, United States
Eliassen Group
Job Overview: Lead the development and enforcement of enterprise data exchange standards, including XML IEPDs and API guidelines, ensuring consistent and secure data exchanges internally and with external partners. Required Security Background: Active Secret Facility Clearance required at the time of application Eligibility to obtain and maintain FBI security clearance Willingness to sign a Non-Disclosure Agreement and … Warrantless Search Agreement Required Experience: 5+ years designing, developing, and standardizing APIs (RESTful, SOAP, GraphQL) In-depth knowledge of API security principles (OAuth, JWT, OpenID Connect) 8+ years in software development with object-oriented programming Experience with API management platforms like AWS API Gateway Designing and implementing XML schema Preferred Experience: Criminal justice information exchange standards … Law enforcement data exchange protocols Implementing API standards across large organizations Education: Bachelor's or Master's in Computer Science, Software Engineering, or related field Relevant certifications in software development, API management, or system architecture Key Skills: Advanced expertise in API development and standardization Deep understanding of XML schema design Proficiency in programming languages such More ❯
Employment Type: Permanent
Salary: USD Annual
Posted:

Full Stack Developer

Canterbury
Constant Recruitment Ltd
Software Developer in Canterbury, Kent (office-based) Salary: £40,000 – £45,000 depending on experience Do you have skills in C#, JavaScript, and SQL? Do you enjoy API development—both writing and consuming—as part of a wider full-stack role? Would you like the opportunity to work in an office-based role where you can closely collaborate … a competitive edge in the telecom and energy sectors. As part of their expansion, they are now looking to onboard a Full Stack Developer to join their friendly, collaborative development team. You will have the chance to work across the full stack, with a particular focus on API development—both writing and consuming—and be involved in … the full software lifecycle, from design to delivery. What you will be doing: Designing and developing software applications using .NET and C# Contributing to both backend and frontend development Creating, consuming, and integrating APIs Collaborating with the team to add new features and fix bugs Staying current with new technologies and suggesting improvements Supporting clients and ensuring the successful More ❯
Employment Type: Permanent
Salary: £45,000
Posted:

Backend Engineer - Kotlin (m/w/d)

Berlin, Germany
Voize GmbH
alike Shape the future of our integrations - Develop interfaces that seamlessly connect voize with systems in the medical, care and engineering sector Build future-proof solutions - Develop a scalable API, set industry standards, and work closely with partners and clients Take end-to-end ownership - From the idea and implementation to the ongoing development of our integrations Architecture … saves caregivers time, improves documentation, and supports people who do amazing work every day. Requirements Your Skillset - What you bring to the table Several years of experience in backend development and API integration , particularly Proficiency with Kotlin and flows is essential for this position Experience with infrastructure technologies such as Linux, Kubernetes, Docker, and AWS API design … and development with REST or GraphQL , as well as authentication Team Our team at voize consists of 45 passionate members working in the areas of product/development, data, customer success, sales, support, marketing and HR. We are a dynamic and ambitious team that works closely together to continuously improve our voice AI solutions for the care industry. More ❯
Employment Type: Permanent
Salary: EUR Annual
Posted:

DEV OPS Engineer - contract

Leeds, Yorkshire, United Kingdom
Interface Recruitment UK
Role The DevOps Engineer will participate in the entire development lifecycle, including requirement analysis, system design, development, quality assurance, testing and deployment. Establish a digital environment and automate processes to minimize variation and ensure predictable high quality code and data. Ensure that high levels of automation are implemented and maintained across the teams. Hands on into daily work … relationships with global business users and other IT teams Profile The DevOps Engineer, experienced in Agile and DevOps methodologies. Experience with core Java, Spring and design patterns; Experience with API development and Microservice framework; Experience on continual integration framework Experience with Unix including ability to analyse log files; Experience with RDBMS database; Experience on automation testing framework, like More ❯
Employment Type: Permanent
Salary: GBP Annual
Posted:

AI Engineer

Brussel, Belgium
Hybrid / WFH Options
Nexeo
join a multidisciplinary team of experts pushing the boundaries of innovation through cutting-edge AI solutions. As an AI Engineer, you will play a key role in the design, development, and integration of intelligent solutions leveraging technologies like GPT , Azure AI Services , and other state-of-the-art tools. You will work in co-creation with business and technical … and platforms Write clear and structured documentation of code, logic, and workflows Participate in code reviews, knowledge sharing, and best practice sessions Maintain a strong focus on DevOps practices , API development , and performance Stay on top of the latest developments in AI and machine learning through continuous learning and experimentation Educate technical and non-technical stakeholders on generative … related field Proven experience working on AI projects, particularly with OpenAI models and LLMs Hands-on knowledge of prompt engineering , agentic architectures , and OpenAI SDKs Experience in Python , RESTful API development , and cloud integration (Azure Functions, SQL databases, etc.) Familiarity with BI processes , ETL/ELT , and data-driven architecture Strong communication, analytical thinking, and problem-solving skills More ❯
Employment Type: Permanent
Salary: EUR Annual
Posted:

AI Engineer

London, United Kingdom
Randstad (Schweiz) AG
with a strong background in AI production-grade applications with strong experience with LLM models (e.g., GPT, Anthropic, and others). In this role, you will conduct research and development around AI, focusing on automating processes and development at StackOne. We're building a world where users of any SaaS can integrate with the tool of their choice … is what you will help achieve. Responsibilities Research, design, and develop AI models using or training existing or bespoke LLM models (and other AI tech) to improve and automate API & more generally SaaS interactions. Managing and updating Data pipelines used for AI use-cases. Collaborate with cross-functional teams to identify opportunities for AI integration and automation. Optimize and … models and applications for performance and scalability. Stay current with advancements in AI and LLM technologies, applying new knowledge to StackOne's AI strategy. Implement best practices in AI development, ensuring compliance with data privacy and security regulations. Document and communicate research findings and development progress to stakeholders. Collaborate with other software & AI engineer(s) to deliver larger More ❯
Employment Type: Permanent
Salary: GBP Annual
Posted:

Backend Engineer

England, United Kingdom
Forsyth Barnes
solutions. Stay updated with emerging technologies and trends in E-commerce. Ensure compliance with UK regulations (e.g., UK-GDPR, PCI-DSS). Required Experience & Skills: 10+ years in software development, with 3+ years in an architect or technical lead role. Proven experience designing scalable and secure transactional E-commerce websites. Strong knowledge of C#, Java, .NET, JavaScript, and frameworks … like AngularJS. Experience with API development (SOAP, RESTful) and databases (e.g., MS SQL Server, Oracle Endeca). Expertise in web performance optimization and secure development practices (OWASP). Knowledge of relational databases (e.g., MS SQL Server) and document-oriented databases (e.g., Oracle Endeca). More ❯
Employment Type: Permanent
Salary: GBP Annual
Posted:

Lead Software Engineer

London, UK
Harrington Starr
Front End Software Engineer/React UI JavaScript, React, typescript, Redux, NodeJS, GraphQL, ApolloQL, Webpack, Cypress, HTML, CSS, REST, Data Visualisation, API - Perm Role – London – Hybrid £80'000- £100'000 plus bonus Harrington Starr has partnered up with a Global Exchange company that are looking to hire a UI Developer with expert Software Engineering skills using JavaScript, React/… out, designing and developing of UI screens for the users. This will require you to have client facing experience as well as low levy programming with JavaScript and React Development experience. Their systems cover all asset classes from FX, Fixed Income, Interest Rates and Commodities including derivative products although this knowledge is not essential but would be advantageous. Key … End Solid JavaScript programming Strong experience with Systems design and development. Experience with Typescript Experience with Data Visualisation development. HTML and C55 Experience with Webpack Experience with GraphQL RESTful API development. BSc with Computer Science, Engineering or Mathematics. More ❯
Posted:

Lead Software Engineer

City of London, Greater London, UK
Harrington Starr
Front End Software Engineer/React UI JavaScript, React, typescript, Redux, NodeJS, GraphQL, ApolloQL, Webpack, Cypress, HTML, CSS, REST, Data Visualisation, API - Perm Role – London – Hybrid £80'000- £100'000 plus bonus Harrington Starr has partnered up with a Global Exchange company that are looking to hire a UI Developer with expert Software Engineering skills using JavaScript, React/… out, designing and developing of UI screens for the users. This will require you to have client facing experience as well as low levy programming with JavaScript and React Development experience. Their systems cover all asset classes from FX, Fixed Income, Interest Rates and Commodities including derivative products although this knowledge is not essential but would be advantageous. Key … End Solid JavaScript programming Strong experience with Systems design and development. Experience with Typescript Experience with Data Visualisation development. HTML and C55 Experience with Webpack Experience with GraphQL RESTful API development. BSc with Computer Science, Engineering or Mathematics. More ❯
Posted:
API Development
10th Percentile
£43,875
25th Percentile
£51,250
Median
£70,000
75th Percentile
£87,500
90th Percentile
£105,625