451 to 475 of 508 Permanent API Design Jobs

Foundational Full-Stack Engineer - Web3 & AI (London)

Location
Greater London, England, United Kingdom
Labs Ltd is seeking a foundational engineer to help build and scale ROO's platform. This role involves full-stack development, including feature shipping, API design, and integration of blockchain technology. Candidates should have over 4 years of experience with TypeScript, React/Next.js, and Node.js ...

Data Engineer

Hiring Organisation
Qualient Technology Solutions UK Limited
Location
Reading, Berkshire, United Kingdom
Employment Type
Permanent
.NET Core/.NET 8/.NET 10 Production backend development on Microsoft Azure and strong coding in a language relevant to the service. API design, data integration, schema evolution and automated testing. Practical experience with idempotent processing, retries, observability and failure recovery. Ability to diagnose integration defects ...

Quantitative Analyst (Rates Electronic Market Making)

Location
Greater London, England, United Kingdom
programming experience. Technology/programming skills in Rust, C++, Java, KDB, Python, and SQL. Experience with messaging and data serialization technologies, market data processing, API design, latency optimization, code testing, build and deployment tools. Experience taking ownership of existing technologies, building new ones, and performing technology migrations. Working ...

Full-Stack Software Engineer II — React & API

Location
Greater London, England, United Kingdom
requirements through delivery, collaborating with product management, backend teams, platform teams, and brand teams to create configurable components and platform capabilities. The role emphasizes API design, traffic management, and a high-quality delivery lifecycle across Expedia Group web, iOS, Android, and B2B experiences. #J-18808-Ljbffr ...

Senior Backend Engineer: Cross-Border Payments Platform

Location
Bracknell, England, United Kingdom
Xe.com is hiring a senior backend engineer in Bracknell to own problems end-to-end, from API design and data modeling through to service implementation, production reliability, and launch. You will use AI tools daily and help move money across platforms. You'll design and modernize backend ...

Vice President, Full-Stack Engineer

Hiring Organisation
Hackajob Ltd
Location
Manchester, North West, United Kingdom
Employment Type
Permanent
deployment, observability, and reliability. Raise engineering excellence and resilience: best practices and automation across code, testing, microservices/APIs, performance, and infrastructure; secure-by-design with threat modeling, logging/monitoring, incident playbooks, and disaster recovery. Partner with product, design, and operations to translate outcomes into measurable technical … building distributed systems and microservices in agile environments (Scrum/Kanban). Deep Java experience (Spring), architectural patterns for scalable, observable, testable systems; strong API design. Strong DevOps practices: CI/CD (e.g., GitLab), automated testing (JUnit/Spock), code reviews, telemetry/observability (Splunk, AppDynamics), containers (Docker ...

Vice President, Full-Stack Engineer Opportunities

Hiring Organisation
Hackajob Ltd
Location
Manchester, North West, United Kingdom
Employment Type
Permanent
deployment, observability, and reliability. Raise engineering excellence and resilience: best practices and automation across code, testing, microservices/APIs, performance, and infrastructure; secure-by-design with threat modeling, logging/monitoring, incident playbooks, and disaster recovery. Partner with product, design, and operations to translate outcomes into measurable technical … building distributed systems and microservices in agile environments (Scrum/Kanban).. Deep Java experience (Spring), architectural patterns for scalable, observable, testable systems; strong API design. Strong DevOps practices: CI/CD (e.g., GitLab), automated testing (JUnit/Spock), code reviews, telemetry/observability (Splunk, AppDynamics), containers (Docker ...

End-to-End Product Engineer for AI Data Platform

Location
Greater London, England, United Kingdom
Encord, the universal data layer for AI, is hiring a Product Engineer to own features end-to-end—from API design and backend systems to the UI used by annotation teams, ML engineers, and compliance officers. You'll deliver scalable backend services and polished front-ends, collaborating with … customers and design to ship high-impact features rapidly while maintaining strong CI/CD and testing practices. #J-18808-Ljbffr ...

Backend Engineer – Real-Time Data Platform (Rust)

Location
Greater London, England, United Kingdom
Augur Communications Ltd is seeking a Backend Engineer to design and build the distributed systems, storage infrastructure, and platform primitives that underpin Augur's sensor integration product. You will work across the full backend surface—from stream processing and storage to API design and data pipelines—using ...

Remote IAM Platform Engineer — AI‐Native

Location
Greater London, England, United Kingdom
Software Engineer to safeguard and enhance the reliability and usability of our Identity and Access Management (IAM) and platform front-end systems. You will design robust, scalable code, build seamless user experiences, and ensure secure access controls while collaborating with cross-functional teams. Ideal candidates have strong JavaScript/… TypeScript, React and Node.js experience, plus API design, NoSQL (Mongo), and OAuth-like flows. #J-18808-Ljbffr ...

Software Engineer, Healthcare Automation Platform

Location
Greater London, England, United Kingdom
Automate is building healthcare automation software in London. We are seeking a Software Engineer to design, develop and maintain web applications powering our platform used by GP practices daily. You will work across the full development lifecycle with Product, Engineering and Clinical teams, delivering reliable, scalable features. Strong focus … Next.js, React, TypeScript and API design in a collaborative, scale-up environment. #J-18808-Ljbffr ...

AI Product Director

Location
Greater London, England, United Kingdom
leader who delivers measurable results for sophisticated AI products under ambiguous conditions in a fast‐paced environment someone who is as comfortable discussing an API spec or an auth flow with an engineering team as they are presenting an AI strategy to senior management. You will thrive in collaborative … engineering workflows. Genuinely technical and a proven builder. Comfortable as a hands‐on partner with engineering and data science teams, able to reason through API design, system architecture, and technical trade‐offs, with credibility to lead build‐versus‐partner‐versus‐defer decisions. Proven experience identifying, validating, and prioritising ...

Senior Product Manager

Location
Greater London, England, United Kingdom
engineering leadership to influence technical architecture decisions, ensuring solutions are scalable, maintainable, and aligned with platform direction. · Ensure delivery quality through close collaboration with design, engineering, and QA - holding a high bar for what ships. Launch & Growth · Own the end-to-end launch of significant features and capabilities, partnering … card scheme rules (Visa, Mastercard), authorisation and settlement flows, interchange, and regulatory frameworks. · Strong technical fluency - ability to engage with engineering teams on architecture, API design, and system integration decisions. · Demonstrated experience mentoring or coaching other product managers. · Excellent stakeholder management skills with experience influencing senior leaders ...

Full-Stack SDE II: React UI & API Dev

Location
Greater London, England, United Kingdom
Full-Stack to join the Search Results and Recs experience team. You will build React-based user interfaces and backend capabilities, contribute to API design, and own features from requirements through delivery with cross-functional teams. The role emphasizes server-driven UI rollout, migration from legacy systems ...

Software Engineer, iOS

Location
Greater London, England, United Kingdom
implementing responsible, ethical AI practices (e.g., risk assessment, bias mitigation, quality and accuracy reviews) Experience building maintainable and testable code bases, including API design and unit testing techniques Demonstrated ongoing AI skill development (e.g., prompt/context engineering, agent orchestration) and staying current with emerging AI technologies Experience ...

Java / Scala Developer

Hiring Organisation
Quant Capital
Location
London, UK
Employment Type
Full-time
passionate about. The Java Scala developer will be involved in: Web application greenfield developmentWeb analytics & business intelligenceMachine learning, risk modelling, fraud detection. API design and provisionIntegration patterns & messagingHybrid cloud infrastructureJavaScript application developmentWeb application performanceScalabilityExceptional knowledge of low-high level systems coupled with true programming ability. Java Scala Developers ...

Product Manager - Customer Service Platform

Location
Greater London, England, United Kingdom
empathetic support at scale. You’ll help improve the advisor experience through intelligent tooling, define how customers reach support across channels, and strengthen the API layer underpinning our service ecosystem. Your work will bring platform thinking together with real human impact, helping our advisors do their best work … support across chat, email, social messaging, and emerging channels, helping the right contact reach the right advisor at the right time. Strengthen the foundational API layer connecting our support systems, with a focus on reliability, extensibility, and developer experience as the platform scales. Take initiatives from discovery through launch ...

Software Engineer - Cloud Compute Platform

Location
Hursley, England, United Kingdom
global scale. Working in Software means joining a team fueled by curiosity and collaboration. You'll work with diverse technologies, partners, and industries to design, develop, and deliver solutions that power digital transformation. With a culture that values innovation, growth, and continuous learning, IBM Software places … global scale. Working in Software means joining a team fueled by curiosity and collaboration. You'll work with diverse technologies, partners, and industries to design, develop, and deliver solutions that power digital transformation. With a culture that values innovation, growth, and continuous learning, IBM Software places ...

Blockchain / DLT Developer

Location
Ipswich, England, United Kingdom
architects, product managers, and client stakeholders, you will bring deep technical expertise and a proactive approach to solving complex on‐chain challenges. Responsibilities include: Design, develop, and deploy smart contracts and decentralised applications across Ethereum, Hedera, Algorand, and MACH Chain (our proprietary blockchain). Design and implement blockchain … equivalent SDKs for Hedera and Algorand. Proficiency in one or more backend languages (e.g. Node.js, Python, Go, Java) and RESTful/event‐driven API design. Familiarity with blockchain development toolchains including Hardhat, Truffle, Foundry, or equivalent. Experience with version control (Git) and collaborative development workflows. Strong analytical and problem ...

Blockchain / DLT Developer

Location
Greater London, England, United Kingdom
architects, product managers, and client stakeholders, you will bring deep technical expertise and a proactive approach to solving complex on‐chain challenges. Responsibilities include: Design, develop, and deploy smart contracts and decentralised applications across Ethereum, Hedera, Algorand, and MACH Chain (our proprietary blockchain). Design and implement blockchain … equivalent SDKs for Hedera and Algorand. Proficiency in one or more backend languages (e.g. Node.js, Python, Go, Java) and RESTful/event‐driven API design. Familiarity with blockchain development toolchains including Hardhat, Truffle, Foundry, or equivalent. Experience with version control (Git) and collaborative development workflows. Strong analytical and problem ...

Senior Java Developer

Location
Greater London, England, United Kingdom
party integrations. You will work closely with Product Owners, Frontend Developers, DevOps, and QA to ensure smooth, efficient, and secure platform operations. Key Responsibilities: Design and implement backend systems capable of handling thousands of concurrent player connections across multiple services. Develop scalable, modular microservices to support game logic, session … management, and operational services. API Development. Ensure low-latency data processing to support game engines. Collaborate with the product team to build new features, improve system performance, and support business requirements. Work with relational databases such as PostgreSQL and Oracle to ensure reliable and efficient data operations. Manage service ...

Senior Full Stack Developer (C#/React/TypeScript) - REMOTE working

Location
Greater London, England, United Kingdom
/TypeScript Minimum 6 years of solid C# in a commercial environment Produces initial results rapidly and iterate based upon feedback. Knowledge of microservice design principles - preferably with commercial experience. Experience with modern git workflows. Effective communicator and excellent communication skills. Makes pragmatic implementation decisions and can fail fast … rest. Microservices architecture. Docker, Kubernetes in Azure, Vercel. Jenkins/BitBucket Pipelines for CI/CD. RabbitMQ/MassTransit. Microfrontends. Test Driven Development. RESTful API design. GraphQL APIs. Integrations with third-party APIs and SaaS platforms. Benefits Competitive salary and benefits package REMOTE working Holiday allowance 50% staff discount ...

Engineering London, UK or Ljubljana, Slovenia SDK Engineer

Location
Greater London, England, United Kingdom
binary size, startup cost, thread safety, and backward compatibility are the job, not afterthoughts. You will own what you build end to end, from API design through release and live integration support. Based in-office (hybrid model) in London or Ljubljana, Slovenia. You Will Build and maintain … mobile SDK on Android (Kotlin) or iOS (Swift) Own the public API surface: minimal, stable across versions, and hard to misuse Keep the SDK lightweight and resilient, with no crashes in host apps and graceful degradation when the backend is unreachable Own releases, versioning, and distribution (Maven Central, SwiftPM ...

Technical Product Manager

Location
City Of London, England, United Kingdom
investigates that data, and the APIs and integrations connecting it with customers’ existing systems. This is a hands-on role for someone comfortable reading API documentation, mapping data flows and working through technical trade-offs with engineers. You’ll take problems from early discovery through to delivery and adoption … functional requirements, including security, compliance and scalability. Own the direction of customer-facing APIs and emerging agent-based capabilities. Contribute to decisions around API design, versioning, backwards compatibility and developer experience. Create clear documentation and examples for technical customers and partners. Lead discovery using customer conversations, product data ...