1 to 25 of 31 API Development Jobs in the South East

as a specialist consultant, working on a wide array of complex projects across multiple industries. The Role: We are looking for a Software Engineer with a strong foundation in API development and C# to join our data engineering team in a highly regulated industry. In this role, you’ll be instrumental in designing and building scalable, secure software … strict regulatory standards. We’re seeking candidates with over 5 years of relevant experience, a solid understanding of software system design, and a strong command of C# and modern API development patterns. A background in working with data systems, cloud integrations, and secure, large-scale applications will be highly advantageous. Responsibilities: Design, develop, and maintain scalable APIs and … decisions, and system documentation. Stay current with best practices and emerging technologies in software engineering and data systems. Skills & Experience: You will have the following skills or proven experience: API Development: Proven experience designing and building RESTful APIs and services at scale. Experience with authentication, authorization, and secure API communication (OAuth2, JWT, etc.). Familiarity with API More ❯

delivery. This is a hands-on leadership role where you’ll combine people management with technical delivery, taking the lead on architecture, coding, and innovation while supporting the professional development of your team. Location: Hybrid – Milton Keynes (2–3 days per week on-site) Salary: £65,000 – £75,000 + benefits + bonus Requirements for Software Engineering Team Leader … from inception to completion while maintaining high technical standards Adaptability to new tools, technologies, and methodologies Solid technical skills in: .NET (C#) Unit & integration testing CI/CD pipeline development (GitHub or similar) AWS services (IAM, Lambda, API Gateway) Angular, REST APIs, Web API development SpecFlow (BDD), Postman, OpenAPI MS SQL Server (SQL) & MongoDB (NoSQL) Docker … Experience with CQRS and Event Bus architecture is highly desirable Responsibilities for Software Engineering Team Leader Lead, mentor, and support a team of engineers, driving both technical and personal development Oversee architectural design and code reviews, ensuring high standards and consistency Plan and deliver work in line with Scaled Agile Framework (SAFe) principles Embed robust quality assurance practices to More ❯

work with your colleagues, stakeholders and third parties, to align on requirements and deliver a user experience you can be proud of. The role requires demonstrable experience of backend development using PHP and MySQL, and includes full lifecycle development of RESTful APIs and web apps which can operate at scale on AWS. You will appreciate the benefits of … Experience of software architecture and presenting technical designs to your team and stakeholders. Excellent communicator with a self-starter attitude and comfort working autonomously. Demonstrable expertise and understanding of API development/design and experience interfacing with disparate systems. Applicable understanding of software security, common exploits and secure development practices, including the OWASP Top 10. Proven and More ❯

A public sector organisation is looking for a skilled SharePoint Developer to join their Development and Testing team. This is a key role for someone passionate about building high-quality, scalable applications using SharePoint, Microsoft 365, and Azure services. If you enjoy solving complex problems and collaborating across teams to deliver impactful digital solutions, we'd love to hear … governance, and promoting best practices across the organisation. Responsibilities Design and Customize SharePoint Solutions: Develop tailored solutions using SharePoint and M365 product to address specific business requirements Custom SharePoint Development: Create custom SharePoint apps, Teams apps, and web parts using the SPFx framework (React). Additionally, utilize Power Apps, Power Automate, and related technologies. Application Maintenance: Utilize DevOps practices … security of SharePoint environments Configurating and deployment: performing site configuration for new installations, deploying custom features, and staying up to date with the latest SharePoint developments and upgrades. Secure Development Practices: Developing clean, reusable, scalable, and maintainable code following the Software Development Life Cycle (SDLC). Conducting peer code reviews upon request and adhering to development coding More ❯

scalable solutions from the ground up, and work closely with clients to solve meaningful business problems. You'll operate in small project teams (or sometimes independently), across the full development lifecycle from business requirements through to deployment and optimisation. Key Responsibilities Design, develop, and deliver high-quality software solutions in line with client needs and business goals Lead or … architecture, offering input into technology and design decisions Collaborate directly with clients to understand their operations and challenges Work across the full stack - backend through to frontend using modern development practices Take ownership of project delivery with an awareness of budgets and timelines Apply a problem-solving mindset and adapt quickly to different industries and business domains Core Technical … Skills Required C#/.NET (Core and Framework) strong backend development experience essential JavaScript and React for building responsive, user-friendly front-end applications Familiarity with API development (RESTful services) Experience with SQL Server and database integration Comfortable working in DevOps environments (CI/CD pipelines, version control, automated testing) Strong understanding of application architecture and scalable More ❯

testing, and implementing modern microservices-based applications running in the public cloud. This is a hands-on position within a feature team that works collaboratively across the full software development lifecycle. What You'll Be Doing Designing, producing, testing, and implementing high-quality software across the system lifecycle Working within a permanent feature team focused on delivering business-critical … in a fast-paced Agile environment (two-week sprints) Collaborating with architects, principal engineers, and key stakeholders to align technical solutions with business objectives Applying Agile and Test-Driven Development (TDD) principles to build resilient, fast-running, and maintainable code Building and maintaining API-driven Java microservices hosted on public cloud infrastructure Contributing to intentional architecture while supporting … Proven ability to design and deliver well-tested, production-ready software with strong focus on functional and non-functional requirements Deep understanding of microservices architecture , cloud-native applications, and API development Experience with distributed systems - managing workloads at scale using modern practices for availability, performance, and observability Knowledge and experience with Test-Driven Development (TDD) and automated More ❯

such as graduates and juniors Oversee software architecture, ensuring seamless integration with various platforms. Gather and analyse requirements, refining features and technical solutions. Lead the estimation process and ensure development work is accurately scoped. Debug existing code, maintain system performance, and drive best coding practices. Manage defects and oversee their resolution across the development team. Experience : 5+ years … experience in software engineering, with a strong focus on Java development. Experience leading and/or mentoring technical teams within fast-paced, agile environments. Expertise in microservices architecture, REST API development, and security. Experience with version control (GIT preferred) and cloud platforms like AWS. It would be a plus if you also possess previous experience in: TDD/ More ❯

reused. You'll be part of a small, agile, multi-disciplinary team working on open data platforms and services that make a real difference. This is a hands-on development role with strategic influence, where you'll help shape architecture, engineering practices, and delivery standards across a growing programme team of 60+ people. Key Responsibilities Design, build, and maintain … Ensure code quality, documentation, and maintainability Align delivery with recognised standards including the Technology Code of Practice and Service Standard Essential Skills & Experience 4+ years of experience in software development Strong proficiency in Ruby (Python is a bonus) Experience with microservices or service-oriented architecture Skilled in writing clean, well-documented code and taking ownership of the development process Comfortable working in agile , cross-functional teams Familiarity with: Docker & Kubernetes Git & version control API development (REST, GraphQL) Cloud deployment Open data platforms or search technologies Desirable Experience working with or within government or public sector teams Background in open data , civic tech, or mission-driven organisations Working Arrangements Base location: London or Manchester (2 days More ❯

be willing to undergo the clearance process. Day-to-day of the role: Develop and optimise user interfaces using React and Next.js for front-end development. Handle back-end API development using .NET (C#), ensuring secure coding and integration logic. Manage Azure hosting and infrastructure, including services like Azure SQL, Azure Key Vault, and Azure DevOps. Implement and … and integration with systems such as Dynamics 365, SharePoint Online, and Gov.UK Pay (or other payment providers, secure payment gateway integration). Required Skills & Qualifications: Strong experience in UI development, performance optimisation, and accessibility. Proficient in React and Next.js for front-end development. Experienced in .NET (C#) for back-end development. Familiarity with Azure hosting and infrastructure management. Experience More ❯

BPSS to start; active SC required due to timescale of the project Team: 10 direct reports, part of a 60+ programme Experience: 4+ years Essential Skills Technical: Strong Ruby development (primary focus), Python experience desirable Experience across multiple services, particularly data services Docker, Kubernetes, Git/version control API development and integration Agile working practices and adherence … to technical standards Approach: Pride in producing high-quality, well-documented code Ownership of the full development process Collaborative working with user-centered design (UCD) teams Thrives in small, agile, multi-disciplinary teams Key Responsibilities: Develop Ruby-based applications and data services Build and maintain APIs and open data platforms Ensure code is high-quality and well-documented Work … For: Senior Ruby developer with strong focus on code quality Experience working with data services Comfortable working in small, agile teams and collaborating with UCD teams Desirable Skills: Python development Experience in public sector or government projects Knowledge of search technologies and open data platforms Active SC clearance More ❯

BPSS to start; active SC required due to timsecale of the project Team: 10 direct reports, part of a 60+ programme Experience: 4+ years Essential Skills Technical: Strong Python development (primary focus), Ruby experience desirable Experience across multiple services, particularly data services Docker, Kubernetes, Git/version control API development and integration Agile working practices and adherence … to technical standards Approach: Pride in writing high-quality, well-documented code Ownership of the full development process Collaborative working with user-centered design (UCD) teams Thrives in small, agile, multi-disciplinary teams Key Responsibilities: Develop Python-based applications and data services Build and maintain APIs and open data platforms Ensure code is of high quality and well-documented More ❯

developer) and an infrastructure specialist - your ideas won’t just be heard, they’ll shape the future. Tech-Forward Culture : Embrace AI-assisted coding and testing tools to accelerate development, testing and deployment. A Breadth of Exciting Projects : From AI-powered analytics and Bluetooth tracking to route optimization and custom API development, you’ll be solving real … on, stored procedures, DB design & maintenance) Strong experience with RESTful APIs, JSON and app integrations Git version control (or similar) HTML & CSS PowerBI reporting What You Bring Full software development lifecycle experience, including testing and documentation Strong debugging skills and a commitment to clean, maintainable code Effective communicator, with both technical and non-technical audiences Ability to work independently … support experience Salary & Benefits Salary: £40–51K basic + annual bonus (currently £4.5–6K), based on company performance 28 Days Annual Leave Life Assurance & Stakeholder Pension Ongoing technical & personal development training Flexible Working Hours (start from 7am if you wish) They plan to move to a 4-day week, every other week, from next year A Purpose-Driven Culture More ❯

PV, BESS, and SCADA/ModbAbout the Role My client is seeking a talented and innovative Software Engineer to join our growing renewable energy technology team, focused on the development, deployment, and maintenance of advanced software and hardware monitoring systems for our portfolio of large-scale solar PV and Battery Energy Storage System (BESS) projects across Southern Africa and … monitoring solutions. · Knowledge of renewable energy systems (solar PV, BESS, grid interconnection) and related data flows. · Familiarity with database design, real-time data processing, and analytics platforms. · Experience with API development and integration for third-party devices and systems. · Understanding of cybersecurity principles and secure software design. · Ability to work collaboratively with multidisciplinary teams and coordinate with on More ❯

application performance and responsiveness. Collaborate with systems, RF, and data engineering teams to integrate software with underlying satellite and network infrastructures. Contribute to system documentation and participate in Agile development processes. Required experience: Proficiency in Python, including experience with multi-threading, asynchronous programming, and concurrency. Experience with relational databases (preferably SQLite) and database schema design. Knowledge of RESTful API development and service integration. Hands-on experience with Docker for application packaging and deployment. Strong problem-solving skills and ability to translate conceptual designs into working prototypes. Excellent collaboration and communication skills, with a focus on rapid iteration and demonstrable results. Nice to have: Experience with Object-Relational Mapping (ORM) tools (e.g., SQLAlchemy, Django ORM). Exposure to … modern C++ (C++17 or later) for application development or system integration. Familiarity with satellite communications, RF systems, or signal processing concepts. More ❯

Cloud Security Engineer (AWS) - Node.js/NestJS and REST API - Authentication (Auth0, Ping Identity) Contract - 12 months, upto £650/day inside IR35 ***Hybrid - 3 days office Leading financial services client is seeking a Senior Cloud Security Engineer and help shape their cybersecurity in a fast-paced, global environment. Key Responsibilities: Design and maintain RESTful APIs and microservices using … Embed DevSecOps best practices across IAM, networking and compliance. Collaborate with Agile teams to deliver high-quality, secure software at scale. Key Skills: Strong Node.js/NestJS and REST API development experience. Skilled in AWS Proficient with IaC, CI/CD (CloudFormation, Terraform) Cloud security principles, including IAM, networking, and encryption If this is of interest and you More ❯

IT systems, infrastructure, and cybersecurity defences, identifying opportunities for improvement. Design and implement innovative technical solutions that streamline workflows and enhance efficiency across the organisation. Contribute to the ongoing development of the firm’s technology strategy, ensuring alignment with overall business objectives. Evaluate emerging technologies and recommend areas for continuous improvement. Design, build, and maintain API integrations to … integration methods. Advanced understanding of the Microsoft 365 ecosystem and Azure cloud services. Familiarity with legal sector applications (e.g. iManage, 3E, Intapp, Mimecast, Tessian, Litera) is advantageous. Experience with API development, data integration, and automation tools. Proficiency in SQL, JSON, OData, and REST APIs; experience with data warehousing best practices. Working knowledge of Microsoft Power Apps and low More ❯

teams, with responsibility not just for delivery but also for mentoring peers, shaping design decisions, and contributing to long-term planning and technical standards. What you'll need: SPA development experience using JavaScript and TypeScript Proficiency in both Vue.js (v3) and Nuxt.js HTML5, CSS3+, Tailwind, and responsive design implementation CSS pre-processors (SASS, SCSS) and build tools (Vite, Webpack … PrimeUI, Axios, GitHub or equivalent version control Experience with MSAL and single sign-on (SSO) REST-based API development UI/UX, accessibility (WCAG/WAI), and usability standards Wireframing, prototyping, and high-fidelity mock-ups Use of Figma, Sketch or Adobe XD Testing tools such as Cypress, Mocha, Jest, Selenium, Playwright, Docker, Postman Experience in Agile and … and strategically valued team Hybrid structure with two remote days per week Involvement in architectural design, estimation and mentoring responsibilities Scope to evaluate new technologies and directly shape future development approaches Get in touch to find out more. More ❯

teams, with responsibility not just for delivery but also for mentoring peers, shaping design decisions, and contributing to long-term planning and technical standards. What you'll need: SPA development experience using JavaScript and TypeScript Proficiency in both Vue.js (v3) and Nuxt.js HTML5, CSS3+, Tailwind, and responsive design implementation CSS pre-processors (SASS, SCSS) and build tools (Vite, Webpack … PrimeUI, Axios, GitHub or equivalent version control Experience with MSAL and single sign-on (SSO) REST-based API development UI/UX, accessibility (WCAG/WAI), and usability standards Wireframing, prototyping, and high-fidelity mock-ups Use of Figma, Sketch or Adobe XD Testing tools such as Cypress, Mocha, Jest, Selenium, Playwright, Docker, Postman Experience in Agile and … and strategically valued team Hybrid structure with two remote days per week Involvement in architectural design, estimation and mentoring responsibilities Scope to evaluate new technologies and directly shape future development approaches Apply now More ❯

mentorship from senior ML engineers, AI researchers, and founders. Freedom to experiment with state-of-the-art models, tools, and frameworks. Modern tech stack (Python, LangChain, Hugging Face, OpenAI API, Pinecone, Kubernetes, etc.). Flexible working — remote-first culture with in-person team sessions for collaboration. Career acceleration — opportunities to own projects, lead development, and shape the product … Data Science, AI Research, MLOps, Data Pipelines, Prompt Engineering, Model Fine-Tuning, Cloud Computing, AWS, Azure, Google Cloud, AI Infrastructure, Transformers, Reinforcement Learning, Vector Databases, Pinecone, Weaviate, Semantic Search, API Development, AI Deployment, Model Serving, AI Automation, Early Stage Startup, AI Startups, Tech Startup, Machine Intelligence, Applied AI, AI Applications, AI Innovation, AI Product Development, AI Tools … Research Engineer, ML Developer, Data Engineer, Graduate AI Engineer, Entry Level AI Engineer, Junior ML Engineer, AI Internship, AI Fellowship, Applied Machine Learning, AI Model Development, AI Systems, Deep Tech, AI R&D, AI Solutions, AI Platform, AI Careers, Computer Vision, Speech Recognition, Chatbot, AI Copilot, Cognitive Computing, Intelligent Systems. More ❯

Solutions Architect (Integration | API Design) St Albans (Hybrid) Compensation: £95,000 +Bonus +Equity Method Resourcing are proud to be partnering with a fast-growing, international technology business delivering critical services across multiple high-reliability sectors. They're seeking a Solutions Architect to lead the end-to-end technical design of mission-critical platforms and services. The Role: We're … disparate systems, and overseeing their seamless migration to a new, unified platform - ensuring zero downtime throughout. In addition, you'll lead the standardisation of tooling, practices, and documentation across development teams, establishing a single source of truth to drive consistency and quality in solution delivery. Key Responsibilities: Own and deliver end-to-end architecture across microservices, APIs, message buses … emerging technologies What We're Looking For: Proven experience in Solution Architecture or Solution Design, ideally in environments involving systems consolidation or major technology transformations Proficiency in cloud platforms, API development, message buses, DevOps practices, and languages such as C#, Python, or PHP Ability to clearly document and present architecture decisions, trade-offs, and constraints to technical and More ❯

and very valuable role in the UK pension industry. We are top in our field because of our people. Were looking for a skilled SharePoint Developer to join our Development and Testing team. This is a key role for someone passionate about building high-quality, scalable applications using SharePoint, Microsoft 365, and Azure services. If you enjoy solving complex … Canvas), and Power Automate. The role also involves application maintenance, deployment, governance, and promoting best practices across the organisation. Were looking for candidates with proven experience in custom SharePoint development using SPFx (React), and a strong understanding of M365 services. You should be confident working with cloud technologies like Azure, API development and integration, and SharePoint administration. More ❯

and/or Solutions Designer(s) to ensure understanding of business requirements on larger delivery items. Key Skills & Experience Proven experience as a Software Developer . Strong expertise in API development and service integration . Proficiency in C# and the .NET framework . Solid understanding of SQL databases, including performance tuning and query optimization. Knowledge of Azure Devops More ❯

and/or Solutions Designer(s) to ensure understanding of business requirements on larger delivery items. Key Skills & Experience Proven experience as a Software Developer . Strong expertise in API development and service integration . Proficiency in C# and the .NET framework . Solid understanding of SQL databases, including performance tuning and query optimization. Knowledge of Azure Devops More ❯

Learning, AI, Artificial Intelligence, Azure, PyTorch, TensorFlow, LangChain, OpenAI, Docker, Kubernetes, GenAI, ETL) to join their team on a permanent basis. this role we be responsible for the design, development and delivery of advanced analytics and AI solutions. This is a fantastic time to join a top-tier global law firm who have a long-stream of projects in … platforms (Ideally Azure) AI/ML Frameworks Generative AI Data engineering knowledge Solution Delivery Design, build, and deploy data science and AI solutions end-to-end, from design and development through testing, release, monitoring, and support. Operationalize models with CI/CD pipelines, automated testing, and monitoring, applying MLOps practices such as versioning, retraining, and drift detection (tools: MLflow … features, including embeddings, retrieval-augmented generation, and building AI agents and chat-based solutions. Write clean, testable, and well-documented code using modern engineering practices (unit testing, code reviews, API development, Azure DevOps preferred). Technical Design & Architecture Ensure solutions align with enterprise architecture, data governance, and security standards Collaborate with enterprise architects, IT, and business stakeholders to More ❯

Engineer with solid SQL skills and experience in building and maintaining back-end APIs. SQL - strong experience essential. Python - required for data processing and integration tasks. Proven experience in API development and maintenance. Previous experience within a financial services or investment management environment preferred. Strong analytical mindset and attention to detail. Excellent problem-solving and communication skills. Oscar More ❯