1 to 25 of 39 Permanent API Development Jobs in London

Senior Developer, Back End, API, .Net SQL, NW London to £80K (office based role) A Senior 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 … required with expertise in .NET, C#/VB, 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 ...

scale. About the Role As a Founding Engineer, you will have responsibility across the entire technical stack — from architecture and infrastructure through to product development and optimisation. You will operate with a high degree of autonomy, solving difficult engineering problems and establishing the foundations of the company’s technology. … systems. Solve complex technical challenges with speed and precision. Build prototypes, test ideas and rapidly iterate towards production solutions. Establish engineering standards, tooling and development practices. Optimise systems for performance, reliability and scalability. Work directly with founders to shape product strategy and technical direction. Take ownership of projects from ...

technical leadership for the design, build, productionisation and ongoing operation of secure Django-based applications and supporting infrastructure. The role will establish the development processes, coding standards, API standards, security approach, RBAC model and application architecture needed for repeatable delivery. The developer will bring extensive experience in productionising … securing Django applications, embedding automated testing, CI/CD and agile development practices, and creating documentation to support Technical Design Authority (TDA), security assurance and operational handover. Responsibilities Lead the architecture, development and deployment of secure Django applications and associated infrastructure in Azure. Define and embed Django development ...

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 ...

Freelance Senior Java Resource on Contract Total Experience : 4 years Skills: Java Development, Acquainted with usage of Jira, Usage of Eclipse, Maven and Code management using GitHub Expectation: Attend daily stand up meeting with client, develop and review code. End to End responsibility. Remuneration: INR 80,000 per month … SITEL) Total experience : 8-9 years Relevant experience : 5-6 year. Very strong in HTML, CSS, Javascript, PHP, JQuery, SQL, Angular, React, Web/API services, web architect, Node.js Python will be add‐on advantage. Upload your profile on Imurgence and Send Profile to saikat.ghosh@sitel.com Added date ...

Senior Backend Software Engineer - Application Development Own the architecture and delivery of scalable backend services for Palantir's Foundry platform. Location: London Job Tags: Software About The Role Palantir builds the world's leading software for data-driven decisions and operations. By bringing the right data to the people … system that enables a novel workflow, the next you could be fine-tuning performance to enable low-latency operational outcomes. Our Product Development organization is made up of small teams of Software Engineers. Each team focuses on a specific aspect of a product and work collaboratively to build cross ...

Architect to take a leading role in designing robust, scalable, and innovative technology solutions for our clients. You will work closely with stakeholders and development teams to ensure the alignment of technology with business goals, while championing best practices in architectural design and delivery. Key Responsibilities: Collaborate with development … lead and influence technical discussions Proven experience as a Technical Architect or similar role In-depth knowledge of system design, software architecture, and development methodologies Experience with cloud platforms (e.g., AWS, Azure, Google Cloud) Expertise in architectural design, data pipelines, cloud platforms, and API development Knowledge ...

live applications and production environments Technical Skills: Creativity & Problem-Solving Adaptability & Flexibility Able to use AI tooling (CoPilot, Devin, Etc) to accelerate application and API development. Able to guide, analyze, correct, explain, and improve AI output. Aptitude for technology; curiosity, passion and startup mindset Practical application and understanding ...

Senior Backend Engineer - API, Python, Nextjs, Node, AI, Workflow Automation I am seeking a Senior Backend Engineer who thrives on solving complex operational challenges at scale. This isn't a feature factory role, it's about designing the Back End systems that automate workflows, improve reliability, and enable … teams. Experience with workflow engines, event-driven architectures, AI integrations, or automation platforms would be an advantage but isn't essential. Key Technologies: Python API Development/Architecture AI Workflow Automation SQL CI/CD Nextjs Nodejs This is a full time role offering a very competitive salary ...

providing Next Gen Engineering Services dedicated to transforming businesses. Our services span all facets of Digital Transformation, DevOps & Cloud, Integration, Automation, Low Code Application Development and AI-enabled services. Sandhata is a privately held IT services company with bases in the UK and India operating worldwide to help clients … strong Python engineering with DevOps enablement and hands-on integration of LLM technologies into secure, scalable enterprise environments. The ideal candidate will bring practical development and platform engineering experience, strong DevSecOps skills, and the curiosity to solve emerging engineering challenges in this rapidly evolving Gen AI space. Key Responsibilities ...

solutions providing market-leading services for our colleagues, customers and advisers. What you'll do The Engineer is responsible for the design and development of strategic software solutions, ensuring that requirements are met, best practices are followed and that all software developed is of a high quality and robust … nature. Working with Project Managers, Product Owners, Architects, Business Analysts and Testers the successful .Net Engineer will share responsibility for project feasibility, requirements, design, development, quality and delivery. They will need to work positively and effectively within teams of mixed abilities and experience and be adaptable within changing environments. ...

/.NET, TypeScript or C++. Strong AWS and cloud-native engineering experience. Experience with Docker, Kubernetes and event-driven architectures. Strong backend engineering and API development experience. Experience building scalable distributed systems. Strong engineering mindset with a passion for modern technologies and AI tooling. Highly Desirable Commodity trading ...

robust error handling, retry logic, and graceful degradation strategies Monitor system performance and optimize bottlenecks to ensure sub-second latency for critical monitoring operations API Development Develop secure, well-documented RESTful APIs that allow users to integrate our monitoring tools into their workflows Implement authentication, authorization, and rate … protect users data and ensure fair resource usage Build webhook systems and real-time notification services to alert users about critical safety events Design API interfaces that are intuitive for developers while remaining flexible for diverse user use cases Design and implement integrations with Security Information and Event Management ...

Principal Engineer (Payments) Our long-term trusted partner, a leading financial services corporation, is hiring a Principal Engineer to drive the development and design of several greenfield retail banking platforms as our clients rebuild their product portfolio as they continue on their digitial transformation journey. This is a senior … product roadmaps, focus on architectural challenges, and provide hands-on technical leadership to a team of engineers. Your responsibilities will include: Lead the development and implementation of a modern cloud foundation and data platform that is robust, scalable, fully automated, secure, and can support the growth of the business. ...

life sciences and pharmaceutical organisations modernise and scale their statistical modelling capabilities. This role combines statistical expertise with modern data engineering practices, enabling the development of robust, reproducible, and production-ready analytical solutions. You'll work closely with biostatisticians, data scientists, and technical stakeholders to improve modelling approaches … complex statistical concepts into practical business and technical solutions Skills & Experience Essential Strong statistical background, ideally within Biostatistics Advanced R programming skills, including package development Experience with Git and collaborative development workflows Knowledge of CI/CD pipelines, automated testing, and software engineering best practices Strong understanding ...

Applied AI engineering, ML engineering or software engineering background · Experience with LLMs, RAG, embeddings, prompt engineering or fine tuning · Exposure to LangChain, LangGraph, Agent Development Kit or similar agent frameworks · Experience with vector databases such as Pinecone, Chroma or similar · API development experience, ideally with FastAPI ...

sign-off Your Skills and Experience Core Java Skills - Good understanding of Java fundamentals including object-oriented programming, collections, exception handling and concurrency. Integration, API Development and Databases - Experience building and deploying event-driven and RESTful APIs, with foundational knowledge of SQL and relational database design Infrastructure ...

play a key part in enhancing existing systems, building new solutions, and driving innovation across the firm's application landscape. The position combines .NET development, SharePoint expertise, and modern front-end technologies , working closely with technical and business stakeholders to deliver scalable, user-focused solutions. Key Responsibilities Analyse business … third-party services Troubleshoot and resolve technical issues across supported platforms Provide user support and training where required Contribute to continuous improvement of development processes and tools Work closely with stakeholders across the business to deliver high-quality solutions Support occasional out-of-hours maintenance to ensure system stability ...

team on Greenfield projects which you'll take ownership of and will see the business impact of. There's a focus on backend and API development although you'll also have elements of front end work with JavaScript and React.js. Location: You'll be based in plush City … office on a fulltime basis, Monday to Friday. About you: You have expertise with C# .Net, ASP.Net development You have a strong knowledge of databases (SQL or Oracle) You're comfortable with JavaScript/React You have a thorough knowledge of Computer Science fundamentals such as OOP, Design Patterns ...

delivery team building and enhancing cloud-native backend services within a modern enterprise environment. Role Overview The successful candidate will contribute to the design, development, and support of Java-based applications using Spring Boot and AWS , working as part of an Agile, multidisciplinary team. Alongside strong backend engineering skills … capability, enabling engineers to interrogate data and support business reporting requirements. This is a hands-on software engineering role with opportunities to contribute to API development, cloud-native architectures, and modern DevOps practices. Key Responsibilities Develop and maintain Java-based backend applications using Spring Boot Design and implement ...

seeking a Full Stack Developer to join a globally recognised organisation as part of a small development team, building and enhancing their product range. Previous commercial experience in a Full Stack development role is essential. The company offers flexible hybrid working, with just one day per month required … their London office. Technical Requirements C#/.NET React AWS or Azure API Development Agile Additional & Beneficial Skills: Salesforce Apex Please apply to this advert or email your CV direct to Applicants must be based in the UK and possess British Citizenship, ILR or Settled Status. Spectrum ...

architecture and technologies in AWS environments. Experience with web application services such as NGINX, Apache, JBoss. Experience of Test Driven or Behaviour Driven development. API development and integration (preferably using Go but not essential). Experience with monitoring systems e.g., ELK, Nagios, New Relic, DataDog, Splunk etc. Working ...

environments. \n • Experience with web application services such as NGINX, Apache, JBoss. \n • Experience of Test Driven or Behaviour Driven development. \n • API development and integration (preferably using Go but not essential). \n • Experience with monitoring systems e.g., ELK, Nagios, New Relic, DataDog, Splunk etc. \n • Working ...

pace. \n What you'll do \n \n Rapidly building functional prototypes across a wide range of technology domains, from machine learning systems to API integrations \nLeveraging generative AI coding assistants and productivity tools to maximise development velocityDeveloping proof-of-concept applications that demonstrate the potential of emerging … Research Graduate on technical feasibility assessmentsContributing to technical presentations and documentation of prototype capabilities\n What you'll need: \n \n Strong software development skills with proficiency in multiple programming languages (Python, JavaScript/TypeScript, etc.) \nHands-on experience with machine learning frameworks (PyTorch, TensorFlow, or similar)Extensive daily ...

working software at pace. What you ll do Rapidly building functional prototypes across a wide range of technology domains, from machine learning systems to API integrations Leveraging generative AI coding assistants and productivity tools to maximise development velocity Developing proof-of-concept applications that demonstrate the potential … Collaborating with the Research Graduate on technical feasibility assessments Contributing to technical presentations and documentation of prototype capabilities What you ll need: Strong software development skills with proficiency in multiple programming languages (Python, JavaScript/TypeScript, etc.) Hands-on experience with machine learning frameworks (PyTorch, TensorFlow, or similar) Extensive ...