76 to 100 of 108 API Development Jobs in the UK

Expertise in Backend Development: Strong proficiency in , TypeScript/JavaScript best practices, along with experience in at least one other server-side language. Database Mastery: You're a SQL guru, particularly with PostgreSQL, handling query optimization, data migrations, and database modeling. Solid Grasp of OOP and Design Patterns: Strong understanding of object-oriented programming principles and design patterns, with … scalability, ensuring they manage rapid growth and increasing demands efficiently. High-Volume Performance: Proven expertise in optimizing systems for large transaction volumes, handling concurrency, idempotency, and performance under load. API Development: Skilled in building APIs, including input validation, JWT tokens, and ensuring security & scalability through queue-based systems. Experience: at least 8 years of experience as a Software … Engineer. You're the Engineer We're Looking for if You: Excel in Application Development: You thrive in designing, coding, testing, and maintaining applications using the tech stack mentioned above. Thrive in Remote Collaboration: Excel in a remote-first environment with proactive communication and strong asynchronous collaboration skills to ensure alignment and effective teamwork. You've successfully worked in More ❯

infrastructure tasks. The role consists of: Paid onboarding: Initial hours to familiarise yourself with our technology stack, documentation, codebase, and processes Ad-hoc hourly work: Support, bug fixing, feature development, triaging, and emergency assistance as needed The successful candidate will be especially useful to the editorial team in advising on XML-related issues and tasks. Who This Role Suits … stress environment People interested in digital humanities/academic technology Developers who enjoy working across varied technical areas Those comfortable with both maintaining legacy systems and contributing to new development Freelancers who can respond to requests within a reasonable timeframe Responsibilities Assist with maintenance of our current Web UI (Ember-based) and contribute to the new NextJS React frontend … as directed Support the editorial team with content management and XML triage tasks Help with basic backend API tasks under supervision Provide assistance with infrastructure and DevOps tasks as needed Technical Requirements Required: Basic understanding of XML processing and structure Proficiency in HTML5/CSS3 and JavaScript Ability to read and debug code Comfortable working with version control (Git More ❯

or research value. Lead model experimentation, evaluation, and creative prototyping. Implement and extend recent AI/ML research into functional systems. Operate across the stack: data pipelines, model training, API development, and intuitive interfaces. Introduce new tools, frameworks, and research directions to the team. Foster a culture of speed, curiosity, and experimentation. Enjoy autonomy, ownership, and creative freedom … feature extraction. Proficiency in Python and libraries such as PyTorch, TensorFlow, scikit-learn, Hugging Face, LangChain, and OpenAI/Anthropic APIs. Familiarity with DevOps & tooling (Git, CI/CD, API integration), front-end & visualization (Streamlit, Gradio, React), and cloud environments (AWS/GCP/Azure). Experience with vector and graph databases (Pinecone, FAISS, Neo4j). Understanding of model … drive for impact. And in return, Savanta offers: Salary range: £65,000 - £75,000 Bonus scheme Unlimited annual leave Hybrid working Flexible working practices Health & wellbeing package Ongoing Learning & Development Financial health (pension, life assurance, etc.) Team & Company Socials Committees for Health & Well Being, Charities & Volunteering and DE&I Why Join Us: Savanta was founded on the belief that More ❯

with strong expertise in Python and modern backend systems to design, build, and optimize scalable, secure, and high-performance applications. The ideal candidate will bring hands-on experience in API development, databases, and cloud infrastructure, combined with a passion for delivering clean, well-tested, and maintainable code. This role is open globally to full-time contractors who can … to architectural decision-making and promote best practices in testing, security, and performance. Partner with frontend engineers, product managers, and designers to deliver end-to-end solutions. Foster the development of junior engineers through guidance, knowledge exchange, and structured onboarding support. Own the full backend lifecycle - from initial design to deployment and ongoing monitoring. Requirements 3+ years of professional … distributed systems. Familiarity with modern backend architectures (e.g., microservices, event-driven design). Excellent communication skills in English, with the ability to collaborate across functions. Experience using AI-assisted development tools (e.g., Cursor AI) to enhance productivity, code quality, and collaboration. Thrives in a fast-moving startup environment - flexible, proactive, and self-directed. If you meet the requirements above More ❯

Cloud Security Engineer/Developer (AWS) - Node.js/NestJS and REST API - Authentication (Auth0, Ping Identity) Permanent, up to £88,000 + package ***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 ❯

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 ❯

occasionally to international sites. The technical expertise in Python, JavaScript, RESTful APIs, SQL, cloud infrastructure (AWS or Azure), IoT communication protocols (MQTT, Modbus, BACnet), and data visualizationtools. Responsibilities include API development, system integration, dataoptimization, and performance tuning. The candidate will collaborate with global engineering teams to deliver scalable smart facility solutions, ensuring reliability, efficiency, and compliance with corporate 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 ❯

experience Skills required C# .Net Framework and Object Orientated programming concepts. Oracle and SQL server (PL/SQL & TSQL). .NET Core C# and .NET (Windows & Web) development. Web API development DataStage ETL Databricks Key Responsibilities Develop and maintain applications using C#, .NET Framework, and .NET Core for both Windows and Web platforms. Design and implement Web APIs More ❯

Developer with Front-End focus and active UK Security Clearance (SC minimum, DV preferred) to join our dynamic team. You will play a crucial role in the full software development life cycle, from design and development to testing and deployment, leveraging your expertise in modern JavaScript frameworks, Back End technologies, and cloud infrastructure. This is a fantastic opportunity … challenging and rewarding project within a DevOps/DevSecOps environment. Responsibilities: Design, develop, and maintain high-quality, scalable, and performant applications. Contribute to both Front End and Back End development, demonstrating expertise across the stack. Collaborate closely with other developers, designers, product owners, and DevOps engineers. Implement robust testing strategies to ensure code quality and application stability. Contribute to … the continuous improvement of our development processes and CI/CD pipelines. Participate in code reviews and knowledge sharing sessions. Work within an Agile development environment. Essential Skills: Strong proficiency in TypeScript and JavaScript, with experience in both Front End and Back End development. Experience working with React. Experience with version control systems (eg, Git). Excellent problem 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/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 ❯

to have had some exposure to but don't worry, they're not deal breakers if you haven't - they're Vue, Angular, React or similar. ES6 or 7, API Development and Integration experience, Nginx or Apache and last but not least, Microservices. Of course, if you do have all this then WOW, we definitely want to talk More ❯

with a Senior Product Manager to continually improve The client's digital proposition, which could include product ownership of the newly introduced 'My The client' platform and commercial B2B API portal. 'My The client' enables The client passengers to have a single login which is used to access bookings and self-serve their The client Rewards account (loyalty programme … working with the team to optimise that delivery process. Deliver innovative digital experiences to a global audience to improve conversion, revenue and third-party developers using the commercial B2B API portal. Communicate with and influence 3rd Party Stakeholders and the wider The client business to maintain strategic alignment of the products being developed. Grade Factors Functional Expertise Demonstrates strong … environment. · A minimum of 3 years as a Product Owner. · Experience in loyalty, my account or post purchase is an advantage. · Experience in Salesforce SaaS Applications is an advantage. API product experience will be a further advantage. · Demonstrable experience of working with Agile teams. · Practical experience with Agile tools such as Azure Devops or JIRA/Confluence. Technical expertise More ❯

with a Senior Product Manager to continually improve The client's digital proposition, which could include product ownership of the newly introduced 'My The client' platform and commercial B2B API portal. 'My The client' enables The client passengers to have a single login which is used to access bookings and self-serve their The client Rewards account (loyalty programme … working with the team to optimise that delivery process. Deliver innovative digital experiences to a global audience to improve conversion, revenue and third-party developers using the commercial B2B API portal. Communicate with and influence 3rd Party Stakeholders and the wider The client business to maintain strategic alignment of the products being developed. Grade Factors Functional Expertise Demonstrates strong … environment. A minimum of 3 years as a Product Owner. Experience in loyalty, my account or post purchase is an advantage. Experience in Salesforce SaaS Applications is an advantage. API product experience will be a further advantage. Demonstrable experience of working with Agile teams. Practical experience with Agile tools such as Azure Devops or JIRA/Confluence. Technical expertise More ❯

Databricks, ServiceNow, SAP, Snowflake, and Mulesoft . Architect containerized applications with secure connectivity to backend services. Develop and test APIs for integration across cloud and on-premises environments. Application Development & Deployment Oversee the build of web applications compatible with browsers and MS Teams . Manage UI and backend deployments in SIT, UAT, and Production environments. Manage CI/CD … Experience, and Abilities Required: Deep knowledge of cloud infrastructure , APIs , data engineering , and enterprise connectivity . Hands-on experience with system integration , containerization, and secure application architecture. Proficiency in API development, integration testing , and cross-platform troubleshooting . Strong background in DevOps practices, especially managing CI/CD pipelines with Azure DevOps . Experience overseeing deployments in multiple More ❯

solutions. Continuously improve systems, processes, and tooling — from testing and observability to introducing new technologies and AI-driven enhancements. What you bring Strong experience with Java , Spring Boot, and API development in enterprise-scale environments. Hands-on knowledge of SQL and NoSQL databases, asynchronous processing, and cloud-native systems. Background in continuous delivery, testing methodologies, and modern observability More ❯

stakeholders to identify opportunities for improvement and deliver smart, scalable solutions. What youll be doing Supporting and enhancing existing business systems and integrations Designing and developing new software and API integrations (ETL workflows) Troubleshooting application issues and resolving them efficiently Using Microsoft 365 tools (SharePoint, Power Automate, Forms) to streamline processes Collaborating with internal teams and third-party vendors … Youll have hands-on experience with tools such as MS SQL Server (including SSRS/SSIS), Visual Studio, GitHub, and C# (Blazor or similar). A strong understanding of API development and integration workflows is key. Knowledge of Business Central, Power BI, or FileMaker would be a bonus, as would experience integrating third-party platforms (such as Zendesk … is at the heart of operations. Youll be trusted to own your projects, contribute ideas, and help shape the digital future of the organisation. If youre passionate about software development and enjoy taking ownership of meaningful projects, wed love to hear from you. More ❯

source codebases Write, test, and validate code solutions that address specific bugs or system inefficiencies Implement and refine APIs, database structures, and backend components supporting AI workflows Configure local development environments to replicate and investigate complex issues Ideal Qualifications 1+ years of professional software engineering experience in a fast-paced or technically demanding environment Proven contribution history to one … astropy/astropy django/django matplotlib/matplotlib pytest-dev/pytest scikit-learn/scikit-learn sphinx-doc/sphinx sympy/sympy Advanced proficiency in Python, API development, and structured testing Excellent analytical, written, and communication skills Exceptional attention to detail and persistence in debugging complex systems Residency in one of the following regions: United More ❯

latest iOS platform updates? Write clean, testable, maintainable Swift and Objective-C code? Refactor legacy components to improve performance and stability? Debug and enhance existing functionality? Contribute to scalable API design? Set up and run A/B tests to validate UX and product decisions? Manage the full release cycle via App Store and TestFlight Must-Have Skills 5+ … years of native iOS development? Expert Swift and Objective-C? Experience modernising legacy Objective-C codebases? Strong understanding of iOS SDK fundamentals? Experience with SwiftUI, Storyboards and XIBs? Knowledge of MVVM and clean architecture principles? Strong understanding of async/await and concurrency? Experience with CI/CD pipelines? Proven App Store release experience? Strong unit and UI testing … Nice to Have A/B testing tools (e.g., Firebase)? StoreKit, in-app purchases, payment integrations? Familiarity with Apple HIG? Experience with performance optimisation and profiling? Exposure to scalable API development Eligo Recruitment is acting as an Employment Business in relation to this vacancy. Eligo is proud to be an equal opportunity employer dedicated to fostering diversity and More ❯

funds, or similarly demanding environments. Hold a Computer Science degree from a prestigious university. Have demonstrated success leading teams to build complex database schemas. Possess expert-level proficiency in API development, including creation, testing, and integration. Are highly skilled in SQL and database structuring. Demonstrate exceptional attention to detail and rigorous problem-solving skills. Excel in both written More ❯

Excellent knowledge of PySpark, Python and SQL fundamentals The ability to get to grips with new technologies quickly What's Nice to Have** Experience in dashboarding tools, Typescript and API development Familiarity with Airflow, DBT, Databricks Experience working with Enterprise Resource Planning (e.g. Oracle, SAP) and CRM systems Benefits Become part of a category-defining startup which transforms More ❯

Technology Manager - Logistics - Scale Up - Hands on element - API - Integrations - Data - Permanent - Remote Work - £60-65,000 plus bonus and benefits We are hiring for a scale up business in the logistics and supply chain sector, who, following a reshape of the business are looking to engage a Technology leader to manage a small team but remain hands on … in some key areas. The role is focused on leading a team of 6 with hands on experience in API integrations and onboarding of carriers in to their tech landscape, with a real key eye on the solution design and working through problems as they arise. You will ideally come from an eComms or Logistics background or be a … up. If you have experience of SQL, Process Flows, SFTP's or similar that's going to help too. Core skills/requirements: Technical leadership Hands on experience in API development Technical requirements gathering Solution design Data transfer protocols Ecomms or logistics Then team is small but extremely capable technically and this role is there to guide through More ❯

Liverpool | Hybrid | £70,000-£80,000 DOE About the Role We're looking for a Technical Lead with deep expertise in the Microsoft technology stack to lead the design, development, and delivery of robust software solutions. This role combines hands-on technical leadership with mentorship and strategic oversight - ideal for someone who thrives at the intersection of architecture, coding … and team enablement. Key Responsibilities Lead technical design and development across projects built on the Microsoft stack (e.g., .NET Core, C#, Azure, SQL Server). Architect scalable, secure, and maintainable solutions aligned with business goals and best practices. Guide and mentor developers , performing code reviews and fostering an environment of technical excellence. Collaborate cross-functionally with product managers, designers … compliance with security standards, data protection, and governance requirements. Participate in client and stakeholder meetings , providing technical insight and recommendations. Essential Experience: 7+ years of professional experience in software development with strong hands-on expertise in C# and .NET/.NET Core . Proven experience designing and delivering cloud-native applications on Microsoft Azure . Strong knowledge of RESTful More ❯