151 to 175 of 445 Permanent API Design Jobs

Senior Software Engineer — Infra Agent Systems UK

Location
United Kingdom
infrastructure at massive scale, and help define how self-improving AI agents operate real-world AI infrastructure. Remote based in the UK Responsibilities Design and build production AI agent systems that diagnose, investigate, and remediate infrastructure issues across one of the world’s largest GPU fleets. Build the distributed … production into reliable, reviewed software and automation. Requirements 5+ years of experience building production backend systems, distributed systems, or infrastructure platforms. Strong systems design skills and experience owning significant systems from design through production. Depth in at least one of the following: AI agent systems, orchestration, tool ...

VP, Senior Backend Developer - Blockchain Infrastructure

Location
Greater London, England, United Kingdom
want to be. Be Selective To Be Effective. Be Highly Aligned, Loosely Coupled. Disagree Transparently. Build Dream Teams. Who You Are: You'll design and build backend systems powering blockchain infrastructure and staking products across Galaxy — spanning Ethereum-based systems, staking infrastructure (native and liquid), and blockchain data systems … first development environment that increasingly leverages AI‐assisted workflows. Typical time allocation:roughly 60%building systems and features, 20% code review and mentorship, 20% design, architecture, and product collaboration. What You’ll Do: Build and own backend systems Design and build APIs, services, Ethereum data pipelines and indexers ...

Full-Stack Data Engineer

Location
Glasgow, Scotland, United Kingdom
seeking someone to join our Data Obfuscation team as a Full Stack Developer – Data Engineering to design and deliver scalable, secure, and reusable data platforms and services that support enterprise data protection and obfuscation initiatives. In the Technology division, we leverage innovation to build the connections and capabilities that … innovating to better serve our clients and our communities in more than 40 countries around the world. What you’ll do in the role Design and develop resilient on-prem and multi-cloud database solutions with Java, Spring Boot, Angular, and Python Develop high-performance solutions that efficiently handle ...

Technical Lead

Location
Greater London, England, United Kingdom
technical outcome of the project team. What you will do Technical direction and quality Set the team's technical direction and own architecture and design decisions across the composable stack. Select and justify the right headless CMS, front-end framework and hosting approach for each property, weighing editorial experience … performance, cost and lock-in. Design content models and component libraries that scale across multiple brands, sites, regions and locales. Uphold coding standards and best practices through consistent code review. Ensure developers test their own work before it reaches QA, with automated testing and CI/CD in place. ...

Lead Software Engineer – Residential Operations Platform

Location
City Of London, England, United Kingdom
shape and build our platform. You will work closely with business stakeholders to turn ideas into well-designed, reliable software, taking features from technical design through to delivery and iteration. This is a technical leadership role in a small, growing team. You will spend most of your time designing … separate, secure and available, so reliability and security are part of the job from day one. Key responsibilities Front-end engineering and product delivery Design, build and improve applications using React and TypeScript. Develop accessible, maintainable front-end experiences using HTML and CSS. Improve front-end performance, reliability ...

Senior Principal Architect, CTO Office

Location
Greater London, England, United Kingdom
workloads Data foundations: pipelines andlakehousepatterns (Microsoft Fabric/OneLake, Databricks, or equivalents), streaming and event-driven integration where the problem demands it Enterprise integration: API design and consumption at scale, including REST, OData,GraphQL, and webhook/event patterns into ERP-class systems What sets candidates apart Classical … delivery on the CTO Office's highest-priority technical projects, end to end Write and review code daily; the role never becomes slideware Design and ship agentic and LLM-based systems to production standard: retrieval at scale, evals, guardrails, security and identity,monitoringand auditability Drop into unfamiliar codebases, stacks ...

Senior Solutions Engineer

Location
London, United Kingdom
works with top tier global financial institutions and major tech companies to offer our client products and services directly to their customers. Through our API, we help partners to architect and build integrations to our world class-leading international finance products, which in turn improves our client by increasing … turnaround times. Designing and developing innovative new features that expand the functionality of our client's services and exposing these features through the public API, enabling seamless integration with partner systems and empowering them to leverage the full potential of our client's platform. Diagnosing and resolving complex technical ...

Senior Solutions Engineer

Hiring Organisation
Hackajob Ltd
Location
Westminster, Greater London, UK
works with top tier global financial institutions and major tech companies to offer our client products and services directly to their customers. Through our API, we help partners to architect and build integrations to our world class-leading international finance products, which in turn improves our client by increasing … turnaround times. Designing and developing innovative new features that expand the functionality of our client's services and exposing these features through the public API, enabling seamless integration with partner systems and empowering them to leverage the full potential of our client's platform. Diagnosing and resolving complex technical ...

NSL- Cloud Engineer

Hiring Organisation
BAE Systems
Location
Manchester, United Kingdom
Employment Type
Full Time
core mission capabilities. You’ll work as part of empowered, autonomous DevOps teams with regular contact with end-users to flexibly and efficiently understand, design, develop, deploy and maintain applications and services on AWS. You’ll be encouraged to identify new ways of solving problems and get to work … help you with them AWS Certification at Associate level eg Solution Architect, Developer or DevOps Expertise in microservices and API design Docker, and container runtime platforms such as Kubernetes, EKS, ECS etc Strong understand of operational concepts on AWS, particularly monitoring and observability, FinOps Utilising CI/ ...

Cloud Engineer

Hiring Organisation
BAE Systems
Location
Greater London, United Kingdom
Employment Type
Full Time
core mission capabilities. You’ll work as part of empowered, autonomous DevOps teams with regular contact with end-users to flexibly and efficiently understand, design, develop, deploy and maintain applications and services on AWS. You’ll be encouraged to identify new ways of solving problems and get to work … help you with them AWS Certification at Associate level eg Solution Architect, Developer or DevOps Expertise in microservices and API design Docker, and container runtime platforms such as Kubernetes, EKS, ECS etc Strong understand of operational concepts on AWS, particularly monitoring and observability, FinOps Utilising CI/ ...

NSL- Cloud Engineer

Hiring Organisation
BAE Systems
Location
City and Borough of Leeds, United Kingdom
Employment Type
Full Time
core mission capabilities. You’ll work as part of empowered, autonomous DevOps teams with regular contact with end-users to flexibly and efficiently understand, design, develop, deploy and maintain applications and services on AWS. You’ll be encouraged to identify new ways of solving problems and get to work … help you with them AWS Certification at Associate level eg Solution Architect, Developer or DevOps Expertise in microservices and API design Docker, and container runtime platforms such as Kubernetes, EKS, ECS etc Strong understand of operational concepts on AWS, particularly monitoring and observability, FinOps Utilising CI/ ...

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 ...

Senior Software Engineer

Location
Knutsford, England, United Kingdom
Description To design, develop and improve software, utilising various engineering methodologies, that provides business, platform, and technology capabilities for our customers and colleagues. Development and delivery of high-quality software solutions by using industry aligned programming languages, frameworks, and tools. Ensuring that code is scalable, maintainable, and optimized … secure coding practices to mitigate vulnerabilities, protect sensitive data, and ensure secure software solutions. Implementation of effective unit testing practices to ensure proper code design, readability, and reliability. Accountabilities Development and delivery of high-quality software solutions by using industry aligned programming languages, frameworks, and tools. Ensuring that code ...

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 Staff Architect

Location
Cambridge, England, United Kingdom
picture of how the platform is structured and how it evolves. You'll drive a model-first, domain-driven approach to design, so teams agree on the domain before the implementation. You will: Lead domain-driven design: facilitate domain modelling, define bounded contexts and maintain shared domain models. … Define the target architecture for Altium 365 and keep it consistent across every deployment. Guide the platform's openness: API strategy, integrations, the Developer Center, and the architecture that lets partners build vertical solutions on top. Shape how AI agents work with Altium data: MCP, authentication, scopes and security. ...

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 Backend Engineer, Squad T-Rex

Location
Greater London, England, United Kingdom
scale with us. Your Responsibilities in this Role Own key architecture and implementation decisions for NALA's wallet and Global Accounts foundation Lead design work (RFCs, diagrams, API and system specs) to align on solutions before building Partner with the PM and stakeholders to translate business intent into … generated wallet delegation success rates Help launch Global Accounts into additional markets and kick off our stablecoin card capability Drive engineering quality across API standards, testing strategy, code review bar, and maintainability Manage delivery by breaking down complex work, sequencing milestones, and keeping projects moving end to end Make ...

AI engineer with Agentic experience

Location
Greater London, England, United Kingdom
basis with development team, designers, copy writers and other IT teams. The role develops and presents recommendations from analysis of current solution. Assist in design peer reviews, code peer reviews, build and unit test functional enhancements. Identify areas for code refactoring. Review and contribute to development process and procedures … Defends a recommendation and can confidently support it. Strong organization, communication, and interpersonal skills. Ability to communicate with business and technical audiences and produce design documents suitable for multiple audience types, both client-facing and internal- Must be able to exhibit technical thought leadership and excellent problem solving ability ...

Software Engineer - Backend

Location
Greater London, England, United Kingdom
join the team redesigning their client portal. This is a hands-on role for an experienced mid-level or senior Python engineer. You will design and build the APIs and backend workflows behind new portal features and own your work through to production. You will work in a collaborative … designing maintainable REST APIs, with solid data modelling and relational database practice Good knowledge of authentication, authorisation, single sign-on patterns and secure API design A testing mindset and experience working with CI/CD Confidence diagnosing application, database and performance issues in live environments An understanding ...

Staff Back-end Engineer (Go Lang or Java)

Location
Greater London, England, United Kingdom
week in the office located in London. Your Impact: Guide architectural and technical direction across various teams, executing scalable solutions from design through to deployment. Solve intricate technical problems, taking ownership of mission-critical components and establishing standards of excellence. Set and maintain high-quality benchmarks for system architecture … design patterns, testing, reliability, and performance. Collaborate extensively with senior stakeholders across product, data analytics, and growth teams, aligning engineering objectives with strategic business goals. Mentor and grow team members, enhancing their technical and leadership capabilities. Facilitate team effectiveness by clarifying ambiguous challenges, eliminating obstacles, and making sound technical ...

Staff Backend Developer - Threat Intelligence

Location
United Kingdom
role based anywhere in the UK, reporting to the Sr. Director, Threat Intelligence in the Threat Intelligence department. In this critical role, you will design, implement, and maintain high-performance backend systems. You will collaborate closely with our malware reverse engineering team to build a sophisticated platform that enhances … Zscaler’s core threat detection capabilities.What you’ll do (Role Expectations)Build scalable data pipelines and design systems that ingest, process, and index large volumes of documents and data.Take the lead on improving development best practices across the team, championing standards for code reviews, testing, observability, and documentation.Identify ...

Cloud Architect

Location
Wilmslow, England, United Kingdom
opportunity to drive the software architecture for the next generation of chromatography data systems. You’ll architect scalable, multi-tenant SaaS solutions, incorporating systems design and security, all while having first‐hand access to real customers as they share feedback on their needs for the type of system used … creating the tools to ensure safety in vaccines, medicines, food, and water. Responsibilities Create and document architectural designs following input from stakeholders Act asarchitectural design authorityand enforceadherence to high level design andimplementation best practices Establish best practices for AWS architectures, Agentic Engineering, Security, and DevSecOps Codifyuse ofhexagonal architecture ...

Full-Stack Engineer, Backend Leaning - Payments (Remote - UK, EU and US)

Location
United Kingdom
customer journeys from logs and code, then fix the root cause. Requirements Strong Python skills and a solid background in backend development. Familiarity with API design, cloud infrastructure, storage solutions and common system design patterns. Solid test design and security fundamentals. Careful, detail-oriented approach when ...