176 to 200 of 448 API Design Jobs

Principal Software Developer (Web)

Location
City Of London, England, United Kingdom
from an MVP to a comprehensive companion to the desktop application, as well as continuing the evolution of our Mobile app. Responsibilities Design & Build: Deliver robust, maintainable features across the stack (Scala/Play backend, React/AG-Grid frontend) Mobile Migration: Define the path from Codename … preferred, but not required)experience with Scala/Java preferred, but not required) Mobile Capability: Experience building or maintaining cross-platform Mobile Apps Architecture & Design: Solid grasp of API design, web & mobile architecture, as well as good UX design. Communication: Clear, pragmatic communicator who collaborates well with ...

Senior Java Developer (6 month contract)

Location
Belfast City District, Northern Ireland, United Kingdom
Greenfield build – no legacy codebase Cloud-native tech stack (Java, Spring Boot, AWS, GitHub Actions, Jenkins) Regulatory focus (MiFID II, EMIR, SFTR, etc.) Responsibilities Design and implement scalable, cloud-native backend components using Java and Spring Boot Collaborate with cross-functional teams to deliver features supporting transaction reporting … post-trade transparency, and venue/instrument data flows Translate regulatory requirements into robust, auditable technical solutions Participate in Agile ceremonies and contribute to design, development, testing, and documentation Write unit, integration, and functional tests; support automated test pipelines Deploy services in AWS and contribute to CI/ ...

Lead Software Engineer - Solution & Data Architecture - B2B SaaS Fintech

Location
Greater London, England, United Kingdom
well before any code gets written, with clear communication about the outcomes to be delivered, followed by planning, prototyping when it helps, and a design the team agrees on. As technical lead of an R&D team, you'll work closely with a Product Manager on initiatives, improvements … time. You plan, size and hand out the work, and keep the team unblocked while it ships. Security, scalability, availability and performance are design inputs on every initiative, not a hardening phase at the end. You cover tenant isolation, auth, data protection and auditability, because our clients' data ...

Mobile Security Engineer — RASP

Location
United Kingdom
binary hardening across Swift, C, C++ and Objective‐C. Own secure local storage, app/device attestation, and the applied cryptography that underpins them. Design, build and operate the Python backend services and APIs that turn on‐device threat signals into operational visibility. Work alongside DevOps … security teams. Translate product gaps and requirements into epics and user stories in Jira that the team can build. Use AI coding tools to design, prototype, build, test and document at high speed. Own the capabilities you build throughout their lifecycle, including security research, vendor upgrades and ongoing maintenance. ...

Context Plane Python Engineer

Location
Glasgow, Scotland, United Kingdom
hands‐on senior role with real architectural scope, active cross‐functional collaboration, and strong support for internal mobility and upskilling. Job responsibilities Design, build, and maintain backend services and data pipelines in Python that load firm knowledge into a knowledge graph and vector store Build and evolve the serving … firm, including enterprise AI and large language model gateways Own quality across your components: automated testing, code reviews, observability, and resilient, secure service design Partner with Corporate Technology AI, product, and data science colleagues to translate concrete use cases into working, measurable capabilities Contribute to design discussions ...

Senior Full Stack Robotics SWE

Location
Boston, England, United Kingdom
seamless user experience in demanding real-world environments. What You'll Be Doing Lead the architecture, development and deployment of a greenfield mobile application Design and build scalable cloud services to collect, process and manage structured and unstructured data Develop and maintain RESTful APIs and integrations across distributed systems … Build intuitive, high-performance user interfaces across mobile and web platforms Design data storage solutions, messaging infrastructure and backend services supporting real‐time and asynchronous workflows Establish best practices around software architecture, testing, CI/CD and system observability Mentor engineers through technical leadership, code reviews and collaborative development ...

Infrastructure Developer

Location
City Of London, England, United Kingdom
services and automation that connect complex infrastructure environments. The wider goal is to remove manual infrastructure processes and replace them with reliable, self-service, API-driven services. You will design and develop integrations across areas including bare-metal compute, networking, storage, cloud and workload platforms. A major part … role will involve building API services around a central CMDB, creating a reliable source of truth that can drive automated provisioning, configuration and infrastructure lifecycle management. Responsibilities will include: Building production-grade services and automation primarily in Python Designing REST APIs and integration layers across infrastructure platforms Developing CMDB ...

Infrastructure Developer

Hiring Organisation
Ncounter
Location
London, South East England, United Kingdom
Employment Type
Full-Time
Salary
£110,000 - £130,000 per annum
services and automation that connect complex infrastructure environments. The wider goal is to remove manual infrastructure processes and replace them with reliable, self-service, API-driven services. You will design and develop integrations across areas including bare-metal compute, networking, storage, cloud and workload platforms. A major part … role will involve building API services around a central CMDB, creating a reliable source of truth that can drive automated provisioning, configuration and infrastructure lifecycle management. Responsibilities will include: • Building production-grade services and automation primarily in Python • Designing REST APIs and integration layers across infrastructure platforms • Developing CMDB ...

Scala Engineer | SC Cleared | London | £620 pd

Hiring Organisation
Hays Technology
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£620/day £620 per day (inside IR35)
services while supporting the ongoing evolution of the platform architecture. Key responsibilities Help define the future vision and consolidation strategy for Attribute Reputation services Design and develop scalable, secure and testable backend solutions Build and enhance REST APIs that deliver attribute insights to digital services Improve existing services … simplified technology stacks where appropriate Collaborate with product owners, business analysts, data engineers and wider teams to develop effective solutions Contribute to database design and application development with strong security and data protection principles Support operational excellence through monitoring, reliability and incident resolution Work within a continuous integration environment ...

Principal Product Engineer

Location
Greater London, England, United Kingdom
SDLC towards a more agentic one, you will use AI-assisted tools to increase technical leverage, improve engineering workflows and raise the quality of design, code review, testing and documentation - always with rigorous human judgement. Key Responsibilities Technical Direction : Lead the backend technical effort, establish architectural direction, and guide … team through complex design choices, refactoring priorities and engineering trade-offs. NestJS Architecture : Design and evolve a clean, modular NestJS architecture with clear module boundaries, dependency management, testability and maintainable conventions. Typed APIs and Contracts : Design well-typed, version-aware APIs and integration contracts that are clear ...

Remote API Engineer — TypeScript & AWS Integrations

Location
United Kingdom
Delaney & Bourton seeks an API Software Engineer to join a growing team responsible for a critical API platform. You will evolve a Java-based backend to a modern TypeScript architecture, building REST APIs and integrations with AWS cloud-native patterns. You’ll work closely with a small engineering … group, contributing to OpenAPI standards, containerised deployments, and scalable API design to support customer-facing apps and third parties. #J-18808-Ljbffr ...

Senior AI Engineer

Location
City of Edinburgh, Scotland, United Kingdom
Consultant) to join our Technology Delivery team. In this role, you’ll combine deep expertise in AI/ML engineering and software development to design, build, and deploy advanced generative AI and agentic systems for leading financial services clients. You’ll work hands‐on across the full AI engineering … client expectations. What You’ll Do Architect and develop autonomous AI systems leveraging multi‐modal large language models across text, image, audio, and video Design and implement agentic workflows using prompt engineering, Retrieval‐Augmented Generation (RAG), APIs, and enterprise data integrations Fine‐tune, optimize, and deploy large language ...

Solutions Architect

Location
Greater London, England, United Kingdom
expert technologists working at the intersection of data, AI, data engineering and software engineering. We partner with enterprises, technology companies and governments to design and build bespoke data platforms, intelligent systems and high-impact software products that bring data to life. We engineer data to lifeTM. The Role … looking for an experienced Solutions Architect to join our London team. You’ll design large-scale, data-intensive platforms and intelligent systems for ambitious enterprise clients, working on hard problems: real-time systems operating at significant scale, complex integration landscapes, and platforms where data and machine learning drive customer ...

Senior Ruby on Rails Developer

Hiring Organisation
Run-Time Group Ltd
Location
Reading, Berkshire, South East, United Kingdom
Employment Type
Permanent
fast-moving, product-centric environments. Key requirements: Ruby & Ruby on Rails Full-Stack Engineering: JavaScript, TypeScript, React, Hotwire, Stimulus Node.js & React exposure beneficial API Design: REST, GraphQL, external integrations Data Stores: PostgreSQL, MySQL, Redis, Elasticsearch Async Processing: Sidekiq, Resque Cloud & DevOps: AWS, Heroku, Docker, CI/CD pipelines … Testing & Quality: RSpec, Capybara, TDD methodologies Security, performance tuning, and system hardening AI & LLMs: API integration, prompt engineering, AI-enhanced features and developer tooling Responsibilities: Owns end-to-end system architecture, ensuring solutions are scalable, maintainable, and delivered at pace. Partners closely with Product, Design, and Commercial teams ...

.Net Developer

Location
City of Edinburgh, Scotland, United Kingdom
digital, data and AI. We believe in tailored solutions, assembling expert teams to address each client's unique needs. Our services span strategy, design, technology and data & AI, ensuring seamless end-to-end delivery of platforms, products and services with real-world impact. What sets us apart … commitment to long-lasting, data-driven, user-centered change. We enjoy close collaboration between our teams, ensuring projects move smoothly from discovery to design to delivery. We recognise the crucial link between digital and data, creating intelligent services that leverage both. We work with a range of clients across ...

Principal DevOps engineer

Location
City of Edinburgh, Scotland, United Kingdom
opportunity is based in Edinburgh and offers the chance to shape the future of Aberdeen’s cloud and DevOps capabilities. You will lead the design and implementation of automated solutions across software development, deployment and infrastructure management, with a strong focus on Azure and AKS. Working closely with engineers … leading DevOps practices.* Hands-on expertise with Git, CI/CD pipelines, infrastructure as code and Azure administration.* Experience with microservices, containerisation and REST API design, development and testing.* Expertise in at least one object-oriented programming language, with C# preferred.* Interest in financial services, investment management ...

Software Engineer — Junior / Mid

Location
Greater London, England, United Kingdom
consistency. Services coordinating over Pub/Sub — sagas across offer → contract → tenancy → payment with no distributed transaction to lean on. LLM tool calling, deterministic API calls, and other intra- and inter-service communications all running across the same coordination system. AI harnesses in production. Deploying agentic AI into real … junior, serious internships or shipped side projects count. Fluency in at least one backend language and framework, and the appetite to reason about system design rather than just the ticket. Strong fundamentals: concurrency, HTTP and API design, data modelling (document or relational), and what actually happens when ...

GenAI Full-Stack Engineer

Location
Greater London, England, United Kingdom
part of a collaborative and forward-thinking team. Key Responsibilities Build impactful GenAI solutions: Within your first year, you will contribute to the design and delivery of our new GenAI platforms, directly impacting the productivity of thousands of developers. Shape our technical direction: You will contribute to the technical … Kubernetes, containers, microservices, and event-driven architectures. Solid architectural understanding: A good grasp of distributed systems, resiliency patterns, scalability, and performance engineering. Data and API proficiency: Knowledge of SQL and NoSQL databases, as well as API design and integration patterns. Strong collaboration skills: The ability to communicate ...

Software Engineer - Android Developer

Location
Cheltenham, England, United Kingdom
experience with: Android development (Kotlin, Jetpack Compose) Backend development (Rust, Python or Go) Git and modern development workflows Docker + CI/CD pipelines API design (REST/OpenAPI) Working in secure or controlled environments Nice to have: AWS or Azure experience Kubernetes Agile delivery experience Secure coding ...

AWS Cloud Engineer - Hybrid - MCR or LDN

Hiring Organisation
Anson Mccade
Location
Manchester, North West, United Kingdom
Employment Type
Permanent, Work From Home
Salary
£70,000
Kanban, SAFe or XP Strong communication, collaboration and problem-solving skills Willingness to learn new technologies and work across different project environments Microservices and API design Docker, Kubernetes, EKS or ECS AWS monitoring, observability and FinOps CI/CD tools such as Jenkins, Bamboo, TeamCity or Bitbucket Candidates ...

Software Engineer - Backend Developer

Hiring Organisation
Randstad Digital
Location
Manchester, North West, United Kingdom
Employment Type
Contract
Contract Rate
£70 - £72 per hour
deployed via Kubernetes and AWS environments. Strong working knowledge of event-streaming tools like Apache Kafka or comparable messaging backbones. Deep understanding of RESTful API design, external integrations, distributed transaction handling, and canonical data models. solid grasp of TDD/automated testing, CI/CD pipelines, and active ...

Development & Technical Manager

Location
Aberdeen City, Scotland, United Kingdom
based platforms.* Strong understanding of cloud platforms (Azure preferred; AWS or GCP acceptable).* Experience with modern web technologies and frameworks.* Solid understanding of API design, integration patterns, and modern authentication standards (OAuth2, OpenID Connect, JWT).* Experience with CI/CD pipelines, Git-based workflows, and automated ...

Applied AI Engineering Lead - VP, Markets Operations

Location
Greater London, England, United Kingdom
advance safe, reliable, and effective AI in financial services. As an Applied AI Engineering Lead - Vice President in Markets Operations, you will lead the design and implementation of agentic AI applications that improve operational workflows, controls, productivity, and engineering practices. You will build reusable AI engineering patterns, context management … specialists, and operations stakeholders to identify high‐value opportunities and deliver robust solutions integrated with strategic platforms and operational processes. Job Responsibilities Lead the design, development, and implementation of agentic AI applications that support Markets Operations workflows, controls, exception management, and productivity use cases Define and drive AI engineering ...

Senior AWS API & Integration Engineer

Location
Northampton, England, United Kingdom
Applications (C&CA) practice as a Solution Engineer supporting business-critical acquiring and chargeback services. Working within a collaborative delivery environment, you will help design and build scalable, resilient solutions that enable clients to respond to evolving business needs with confidence. In line with our vision, Consult with Purpose. … Company offices, client sites, and your home; noting that you will be unable to work at home 100% of the time. Key Responsibilities: Design and deliver scalable, secure, and resilient business services that support critical acquiring and chargeback processes. Build and maintain event-driven solutions that enable reliable processing ...

AI Software Engineer

Hiring Organisation
Infosec
Location
London, United Kingdom
Employment Type
Permanent, Work From Home
level role focuses on building intelligent AI agents that can plan, reason, operate security tooling and identify exploitable vulnerabilities within controlled environments. Key Responsibilities: Design, build and deploy AI agents that automate penetration testing, including planning, tool use and reasoning over security findings Develop sandboxed cyber-lab and range … infrastructure using containers and Kubernetes Deliver AI features from initial design through to production, including evaluations, guardrails and monitoring Improve agent performance through prompt engineering, tool orchestration, evaluation and token and cost optimisation Integrate security tools and enable agents to operate safely within defined scopes Work closely with security ...