1 to 25 of 124 Permanent API Development Jobs in London

Senior .Net Developer, C#/VB.Net, API, SQL, NW London to £85K A Back End Developer is required to join this established financial software house based in North London. They work with some of the leading brands in retail and media, offering financial management systems developed in house … required with expertise in Visual Basic .NET, C#, SQL Server, and SAP Business One integration. The ideal candidate should have strong skills in RESTful API development, database optimization, and Azure DevOps pipeline management. Knowledge of API security, CI/CD automation, and Swagger documentation is recommended. Responsibilities ...

define technical requirements, make trade-offs and ensure that solutions are both sustainable and maintainable in the long term. Experience with mobile app development, particularly React Native, is a strong plus and a passion for promoting wellbeing and reducing stress through technology is essential. This role requires wearing many … including monitoring and maintenance Passionate about building innovative solutions and thriving as an individual contributor (IC) within a dynamic team Experience with mobile app development (React Native) is a plus, especially for those with strong web frontend experience An interest in reducing stress and promoting wellbeing through technology Experience ...

Tech: C# .Net, ASP.NET, WPF, MySQL Challenge: Greenfield High Data Throughput platform, API development, industry specific challenges Firm: Well-known fintech50 business, City of London, 10 man flat Dev Team Pay: 80k, Bonus- training budget, Pension, Life/Health, Some Flex Working Development Team Lead Fintech Quant … Lead Developer will Manage the Dev. team including recruitment Build and deliver business requirements Collaborate with Product Owner on defining development requirements and schedule Become enlightened on the system architectureThe environment is that of Facebook or Google, relaxed open with time to think and make the right decisions. ...

though also like the idea of the equally important social/client-facing aspect of the role. The role is responsible for defining the development architecture across a blend of in-house bespoke solutions and 3rdparty products and helping to shape the longer-term strategic development architecture … developing architecture strategy and target architecture model. You will be working closely with delivery team members to coach and promote best-practice solution development architecture as well as supporting business analysts and product owners in planning and story-mapping for new development. You will act as technical design authority ...

Full-Time About MAXTRAMAX MAXTRAMAX delivers innovative technology solutions that help organizations improve efficiency, security, and operational performance. Our expertise spans Artificial Intelligence, Software Development, Digital Transformation, Network Infrastructure, Cybersecurity, and Defense & Security Technology. We are expanding our AI capabilities and are seeking an experienced AI Software Engineer … implement emerging AI technologies. Collaborate with software developers, data engineers, and project stakeholders. Prepare technical documentation and architecture specifications. Support the full software development lifecycle using Agile and DevSecOps practices. Required Qualifications Bachelor's or Master's degree in Computer Science, Artificial Intelligence, Software Engineering, Data Science, Mathematics ...

Engineering community to develop our data and MLOps capability infrastructure Strong experience in software engineering with proficiency in a language such as Python for API development, data engineering and automation tasks A background in working with storage solutions such as PostgreSQL, MySQL, and BigQuery Experience in API … development using tools such as FastAPI or Flask , enabling data access and integration across systems Solid knowledge of cloud platforms (GCP and/or AWS), with the ability to design and deploy data solutions at scale Experience with IAC and CI/CD pipelines to ensure reliable, repeatable ...

London, United Kingdom | Posted on 04/08/2026 Work Experience Software Engineer, SolidWorks API, C#, .NET, DriveWorks, AEC, Design Automation, CAD Developer, C# Developer, .NET Developer, SQL, DAC, VBA, Python, PowerShell, CAD Automation, API, Scripting, Automation Developer City London Province City of London Country United Kingdom … DOE+ Car Allowance or Company Car Location - Hybrid (Dartford, Nottingham, Sheffield or Manchester) Are you a C#/.NET developer with expertise in SolidWorks API and design automation? Join a prestigious industry leader in construction innovation and technology solutions, dedicated to shaping the future of the sector through advanced ...

will play a pivotal role in architecting and developing our next-generation web application and API. This role requires technical leadership, hands‐on development, and mentoring of junior developers. You will drive the adoption of best practices, ensuring scalability, security, and performance. If you are passionate about software development … eligible for visa sponsorship only for candidates that are already based in the UK. Key Responsibilities Technical Leadership: Lead the technical design and development of scalable, secure web applications and APIs, driving best practices across the development lifecycle. Architecture & Design: Oversee system architecture decisions, ensuring alignment with business ...

Lead Developer/Team Lead – FintechTech: C# .net, Azure, SQL, Team City, GIT, TFSChallenge: Greenfield Trading platform, API development, industry specific challengesFirm: Well-known Insurtech software business, West London, 10 man flat Dev TeamPay: 65k, Bonus- 750 training budget, Pension, Life/Health, Some Flex WorkingQuant is urgently … looking for a Lead Developer/Development Manager to join our high profile client. Current challenges include cloud migration, greenfield trading platform development, and bank based API creation. Our client is a well known fintech software house in the City. Day to Day the Lead Developer/ ...

world work better for people. Overview We are looking for an AI Developer to join our dynamic team and contribute to the design, development, and deployment of AI-powered applications and intelligent workflows. The ideal candidate will have a strong background in Python development, experience integrating … into production systems, and the ability to build scalable, secure, and high-performance applications. Experience with data processing, cloud-native architectures, and modern AI development patterns will be highly valued. Responsibilities Develop, test, and maintain AI-powered applications and intelligent workflows using Python in a cloud-native environment Design ...

perfect time to join us! About the Role Level:4 Department: Technology Location: London I Southampton Contract type: Permanent Quilter is building a new API and Integration Platform. As API Product Owner you will own the "what and when" of that platform, turning the API strategy into … prioritised, deliverable backlog and ensuring each API we build delivers real value to integrating organisations. You will work hand-in-glove with the Lead Integration Platform Architect (who owns the "how"), our engineering teams and our delivery partner, and you will play a central role in proving the platform ...

perfect time to join us! About the RoleLevel:4Department: TechnologyLocation: London I SouthamptonContract type: PermanentQuilter is building a new API and Integration Platform. As API Product Owner you will own the "what and when" of that platform, turning the API strategy into a prioritised, deliverable backlog … ensuring each API we build delivers real value to integrating organisations. You will work hand-in-glove with the Lead Integration Platform Architect (who owns the "how"), our engineering teams and our delivery partner, and you will play a central role in proving the platform through priority business ...

looking for a Senior Full-Stack Developer to play a pivotal role in leading the design, development, and deployment of complex software solutions. You will architect and maintain data engineering pipelines, backend services, APIs, demonstrate consideration for design and UI/UX when building user interfaces, delivering reliable … databases, and containerisation (Docker). If this sounds like you, we can't wait to hear from you! KEY RESPONSIBILITIES: Contribute to the design, development, and deployment of robust software solutions, promoting best practices throughout the software development lifecycle Contribute to architecting and maintaining complex data engineering pipelines ...

mobile applications that support an evolving digital strategy. The Role As a Digital Application Developer, you'll be involved in the full software development lifecycle, working closely with product, design and engineering teams to deliver secure, scalable and user-focused digital solutions. You'll contribute to the development … Skills & Experience We're interested in speaking with candidates who have experience in some of the following areas: React, TypeScript and modern JavaScript development Mobile application development using iOS and/or Android technologies API development and systems integration Software design principles and application architecture ...

collaborative environment that fosters continuous learning and creativity. If you are passionate about machine learning, AI, and want to contribute to the platform capability development for our whole organization, we invite you to apply for the position of Technology Architecture in our AI Enablement Team.Job responsibilities:Software Development … field (Ph.D. preferred) with Proven experience of 7+ years in developing IT solutionsProficient in Python & ReactJS and related technologies is required.Experience with GenAI application development including vector stores, RAG solutions, context engineering, prompt engineering, observability is essentialExperience with Agentic AI development & Java Spring Framework would be advantageousUnderstanding ...

GenAI projects.As a Senior Developer, you will be at the driving innovation and delivering cutting-edge solutions. Your expertise will contribute to the development of our platform, shaping its capabilities and providing impactful solutions.Join our dynamic team and be part of a collaborative environment that fosters continuous learning … creativity. If you are passionate about machine learning, AI, and want to contribute to the platform capability development for our whole organization, we invite you to apply for the position of Technology Architecture in our AI Enablement Team.**Job responsibilities:*** Software Development: Design, develop, and maintain applications. Write ...

applications and user-facing digital platforms.Build, support, and enhance APIs and backend services using .NET/C# and Node.js. Work with AWS Lambda and API Gateway to support serverless application development. Develop and maintain integrations between Salesforce and internal systems using Celigo. Write, optimise, and troubleshoot SQL queries, stored … procedures, and database processes. Support Salesforce development using Apex and Aura Components. Deliver responsive, accessible, and high-performing front-end experiences. Implement designs from internal and external creative teams. Create and maintain HTML email templates for both B2C and B2B communications. Integrate third-party services and social media platforms ...

data services, and cloud platforms. You will own end-to-end integration architecture, champion modern engineering standards, and guide engineers through best practices in API design, cloud-native development, and scalable integration patterns. This is a hands-on leadership role, ideal for someone who enjoys coding, problem-solving … steering technical direction while mentoring engineers and collaborating with product, data, and platform teams. What You'll Be Doing Lead the design, development, and delivery of integration solutions across a diverse technology ecosystem Develop secure, scalable APIs, services, and messaging-based integrations Champion best practices in engineering, DevOps, automation ...

ASP.NET Developer – FintechTech: C# .net, Azure, SQL, Team City, GIT, TFS Challenge: Greenfield Trading platform, API development, industry specific challenges Firm: Well-known Insurtech software business, London, 10 man flat Dev Team Salary: 65,000Quant is urgently looking for an ASP.NET MVC Developer to join our high profile … client. Current challenges include cloud migration, greenfield trading platform development, and bank based API creation. Our client is a well known fintech software house in central London. This is an expansionary role building a greenfield financial modelling platform used by major finance business'.Working together with our team ...

production‐grade software. This role is ideal for someone who enjoys working at pace in secure, technically challenging environments, with opportunities to contribute across API development, cloud‐native services and data integration. Typical responsibilities include: Developing software services using languages such as Java, JavaScript, TypeScript, Python or C++ … platforms, data services and streaming technologies Implement monitoring, logging and observability to support live service operation Support secure deployment and operation of applications across development, test and production environments Skills Required Experience working within the UK Security & Intelligence, defence or other secure government environments Strong knowledge of modern software ...

Tech: ASP.NET MVC 5, Restful API, Angular, SQL, Azure Challenge: Greenfield Trading platform, API development, industry specific challenges Firm: Well-known fintech50 business, 40 man flat Dev Team Pay: 120k, Bonus- 750 training budget, Pension, Life/Health, Some Flex Working Technical Architect FintechQuant is urgently looking … hands on Technical Architect to join our high profile client. Current challenges include cloud migration, greenfield trading platform development, and bank based API creation. Our client is well known in the WRAP and SIPP market as a full service provider. The environment is that of Facebook or Google ...

gender expression, disability, origin, religious belief and sexual orientation or any other criteria.**Software Engineer – Edenred PayTech** **Location:** London/Swindon **Department:** Technology & Product Development**About Edenred PayTech** Edenred PayTech is a leading global e-money institution, processing over €100bn in payments annually across more than 30 countries. … contribute to the design, implementation, and maintenance of new features and platform enhancements. You will work as part of a collaborative team, following best development practices to deliver high-quality software that meets business needs.**Key Responsibilities*** Participate in the design, development, and testing of platform features adhering ...

sukupuolen ilmaisusta, vammaisuudesta, alkuperästä, uskonnollisesta vakaumuksesta ja seksuaalisesta suuntautumisesta tai muista kriteereistä riippumatta.**Software Engineer – Edenred PayTech** **Location:** London/Swindon **Department:** Technology & Product Development**About Edenred PayTech** Edenred PayTech is a leading global e-money institution, processing over €100bn in payments annually across more than 30 countries. … contribute to the design, implementation, and maintenance of new features and platform enhancements. You will work as part of a collaborative team, following best development practices to deliver high-quality software that meets business needs.**Key Responsibilities*** Participate in the design, development, and testing of platform features adhering ...

genre, handicap, origine, croyance religieuse et orientation sexuelle ou tout autre critère. Software Engineer – Edenred PayTech Location: London/Swindon Department: Technology & Product Development About Edenred PayTech Edenred PayTech is a leading global e-money institution, processing over €100bn in payments annually across more than 30 countries. We power … contribute to the design, implementation, and maintenance of new features and platform enhancements. You will work as part of a collaborative team, following best development practices to deliver high-quality software that meets business needs. Key Responsibilities Participate in the design, development, and testing of platform features adhering ...

scalability. Mentor other developers and facilitate knowledge sharing. This job might be for you if you have: 8+ years of experience in Java development focused on high-performance applications, with strong expertise in Spring, Spring Boot and Hibernate. Experience with RESTful API development and front-end technologies ...