1 to 25 of 27 Permanent API Design Jobs in London

Data & API Integration Engineer/Architect Location: London customer site – 1/2 days p/week on site Salary: Up to £105k DoE plus bonus Clearance: Active SC preferred - can sponsor if not currently held (British passport required) To apply, email: henry.clay-davies@searchability.com We’re working with … leading technology consultancy delivering secure, large-scale digital platforms across public sector and enterprise programmes. They’re looking for an experienced AWS API & Integration Engineer to help design and deliver modern, scalable API-led architectures. This is a hands-on engineering role focused on building secure, cloud ...

senior individual contributor who combines hands-on Java development with architectural leadership, remaining close to implementation and setting the technical standard through design, code-level guidance, and practical problem solving. Design, build, and evolve highly available, high-throughput, zero-downtime systems and internet-facing APIs that can scale … securely for large retail and external client volumes. Lead architectural decisions across API design, domain modelling, integration patterns, resilience, observability, and operational robustness, ensuring the platform is fit for 24/7 global production use. Work across multiple software engineering teams to drive consistency in engineering standards, development ...

improved valuation,, internal market and others) are architecturally coherent, reusable and aligned with bp's enterprise technology strategy. Establish and chair the GPTI Architecture Design Authority, governing all significant change through structured reviews, design challenges and sign-off gates. Influence and advise VP/SVP-level stakeholders … through risk analytics (VaR, Greeks, Monte Carlo, stress testing), P&L attribution, settlement, invoicing, confirmations and regulatory reporting (REMIT, EMIR, MiFID II, ACER). Design and govern the market connectivity architecture, covering exchange connectivity, broker interfaces, electronic trading platforms, TSO/DSO nomination interfaces and real-time price feeds. ...

scale. EY has been selected for the inaugural Frontier Firm AI Initiative — a collaboration between Microsoft and Harvard’s Digital Data Design Institute — recognising EY’s leadership in shaping enterprise-grade human–AI operating models. In parallel, EY is expanding its collaboration with OpenAI and Microsoft, bringing advanced … adoption. However, many struggle to translate ideas into secure, scalable and reliable production solutions. As a Forward Deployed Engineer, you will contribute to the design and delivery of AI-enabled systems that operate reliably in enterprise environments. Working within a delivery squad, you will take ownership of defined engineering ...

embedded delivery team supporting client's technology and product teams as a senior technical lead within an agile environment. What You'll Do Design, build, and maintain scalable, production-grade software across web, API, and data layers Own technical delivery end-to-end from requirements gathering through … stack Strong proficiency in at least two languages (e.g. Python, TypeScript, C#, Node.js), with confidence picking up others as needed Solid grounding in RESTful API design, microservices architecture, and cloud-native development (Azure preferred) Proven experience with CI/CD pipelines, (Docker/Kubernetes), and DevOps practices Strong ...

Ireland providing specialist services to a wide range of blue-chip clients. The role We are seeking technical polyglots who enjoy both technical architectural design, hands-on coding and peer reviews, though also like the idea of the equally important social/client-facing aspect of the role. … development architecture as well as supporting business analysts and product owners in planning and story-mapping for new development. You will act as technical design authority (TDA) for delivery of technical stories and produce technical documentation artefacts to support the delivery process. Main Responsibilities Duties will include: The design ...

their development workflows safely and seamlessly. Acting as both architect and hands-on builder, you will articulate our vision for AI-accelerated development practices, design platforms that embed AI at every phase of the SDLC, and champion adoption across our organization. We are seeking a highly skilled engineer … model) The Role Define and evolve the vision for AI-enabled SDLC practices, translating business and technical strategy into concrete platform capabilities and processes Design and implement scalable AI platform infrastructure (SDKs, frameworks, deployment pipelines) that enables rapid, safe integration of AI into all phases of development—from coding ...

just familiarity, but production ownership. Azure Integration: Proven experience building applications that consume Azure-native services, including Azure Key Vault for secrets, Azure Storage API, and Azure Service Bus for event-driven messaging. DevOps Mindset: Solid understanding of the full CI/CD lifecycle; comfortable reading and contributing … Dockerfiles and GitHub Actions YAML workflows - not as a DevOps engineer, but as a developer who understands the pipeline their code flows through. API Mastery: Deep expertise in RESTful API design principles, OAuth2 authentication flows (including FusionAuth integration), and DMARC-compliant transactional email logic via SendGrid. Duties ...

just familiarity, but production ownership. Azure Integration: Proven experience building applications that consume Azure-native services, including Azure Key Vault for secrets, Azure Storage API, and Azure Service Bus for event-driven messaging. DevOps Mindset: Solid understanding of the full CI/CD lifecycle; comfortable reading and contributing … Dockerfiles and GitHub Actions YAML workflows - not as a DevOps engineer, but as a developer who understands the pipeline their code flows through. API Mastery: Deep expertise in RESTful API design principles, OAuth2 authentication flows (including FusionAuth integration), and DMARC-compliant transactional email logic via SendGrid. Duties ...

just familiarity, but production ownership. Azure Integration: Proven experience building applications that consume Azure-native services, including Azure Key Vault for secrets, Azure Storage API, and Azure Service Bus for event-driven messaging. DevOps Mindset: Solid understanding of the full CI/CD lifecycle; comfortable reading and contributing … Dockerfiles and GitHub Actions YAML workflows - not as a DevOps engineer, but as a developer who understands the pipeline their code flows through. API Mastery: Deep expertise in RESTful API design principles, OAuth2 authentication flows (including FusionAuth integration), and DMARC-compliant transactional email logic via SendGrid. Duties ...

using modern cloud-native and streaming technologies. Key Responsibilities Develop event-driven integrations and backend services Build connectors, event-processing services, and data pipelines Design scalable integration patterns, schemas, and event flows Develop CDC pipelines and resilient messaging solutions Improve observability through logging, metrics, and tracing Deploy containerised services … Grafana Required Skills Strong software engineering background Experience building integration or event-driven platforms Kafka, Redpanda, or similar streaming technologies Enterprise system integrations and API design Agile development experience Strong communication and collaboration skills Desirable Skills Go and/or Python CDC pipeline development Azure cloud experience Observability ...

secure, and cost-efficient platform infrastructure that enables AI engineering teams to ship and operate AI products reliably in production. What you'll do Design, build, and operate cloud-native AI platform infrastructure across AWS (Lambda, API Gateway, DynamoDB, S3, CloudWatch) and Databricks Deploy and operate containerised services … workflows, and RAG components Implement observability across AI workloads using CloudWatch, MLflow, and OpenTelemetry - covering latency, throughput, cost, and system health Apply secure-by-design principles including IAM, encryption, network controls, and audit logging Work closely with AI engineers to translate prototypes and proof-of-concepts into production-ready ...

into a repeatable process. What you'll do Phase 1 (0-3 months): Lead the greenfield implementation of all core platforms. Build foundational REST API integrations and webhook-driven automations. Define the cross-platform data model - canonical field mapping, entity relationships and data quality standards across … automations in JavaScript and Python - ticket routing, billing triggers, licence lifecycle, CRM sequences, alert-to-action logic. Build and maintain Azure middleware (Logic Apps, API Management, Service Bus) as IaC via Terraform through a CI/CD pipeline. Iterate the acquisition onboarding playbook. What we're looking for * 5+ ...

skilled Sr. Delivery Consultant to join our team at Amazon Web Services (AWS). In this role, you'll work closely with customers to design, implement, and manage AWS solutions that meet their technical requirements and business objectives. You'll be a key player in driving customer success through … working culture. When we feel supported in the workplace and at home, theres nothing we cant achieve. BASIC QUALIFICATIONS - Experience as technical specialist in design and architecture - Experience in cloud based solution (AWS or equivalent), system, network and operating system - Experience in external or internal customer facing, complex ...

building and knowledge-sharing initiatives Skills & Experience Required Significant senior backend development experience with strong Python proficiency (async programming, concurrency, multithreading) Expertise in RESTful API design, OpenAPI/Swagger documentation and API lifecycle best practices Hands-on experience with ML libraries: PyTorch, PySpark, scikit-learn, Hugging Face … machine learning, cloud computing or data engineering highly advantageous Professional accounting qualification desirable but not required Nice to Have Experience with Microsoft Graph API Background in audit, financial services or regulated industry technology What's on Offer A competitive salary and benefits package, flexible hybrid working across 20+ ...

working on the underlying systems that make complex visualisations fast, accurate, and scalable. The challenges range from rendering performance and interaction design through to algorithms, graphics, API design, and numerical correctness. What you’ll be doing Designing and building core charting features used by developers around … exceptionally high technical standards High levels of ownership and autonomy Small team, significant impact Opportunity to deepen expertise in performance, graphics, visualisation, and systems design Package Salary up to £200,000 Hybrid working (London) Private healthcare Pension Additional benefits If you’re interested in building the technology behind modern ...

evolve our stack and make constant improvements. Required Skills/Experience Strong C# development experience Experience with both .NET Core and .NET Web API Experience of building Microservices in .Net Core Experience using Message Based Architectures Experience using both SQL & NoSQL technologies Experience of API design Cloud ...

strong, recent, hands-on full-stack experience. You're genuinely capable across backend and frontend, not just one side. Engineering judgement: clean code, clear API design, sound data modelling, and the instinct to pick the simple, robust solution over the clever one. Shipped impact: features you owned …/TypeScript; relational databases (MySQL ideal) with SQLAlchemy/Alembic; comfort with AWS and Docker. Clear communication: most of our work happens in PRs, design docs and async decisions, so writing clearly matters. Roughly 6+ years building software in production. We read for depth and shipped impact, not years. ...

role, with strong backend expertise in Typescript and Node and front capability in React Proficiency in SQL, Redux, cloud services (AWS or GCP), RESTful API design and GraphQL Strong analytical skills with the ability to design, optimise, and troubleshoot complex UIs Excellent communication and leadership skills; ability ...

products (e.g., Concierge an agentic AI workflow tool, Prism a Mercer knowledge fabric for scheme data, and similar initiatives), from problem framing and design through build, release, and support. Translate risk advisory/consulting needs into clear technical requirements, user stories, and solution designs; partner with stakeholders through … Proven experience as a Tech Lead/Lead Engineer delivering production software, including hands-on coding and code review ownership. Strong backend engineering skills (API design, data modelling, performance) and experience building secure, role-based applications. Experience working directly with business stakeholders in a financial firm, with ...

improving APIs that support critical platform functionality Investigating production issues and tracing problems across distributed systems Working with product and engineering teams to design scalable solutions Improving reliability, observability and performance across existing services Reviewing code, sharing knowledge and helping raise engineering standards across the team Tackling real-world … APIs used by customers or internal teams Other Skills Needed: Solid backend engineering experience in C#, Java, or Go, with a strong grasp of API design and architecture. Hands-on experience managing and debugging production systems across cloud and self-managed infrastructure. Proven ability to navigate complex third ...

develop new features, enhance existing systems, and ensure our platform remains stable and efficient. Your deep understanding of Rails architecture, PostgreSQL optimisation, and API design will be essential as you contribute to ongoing development projects. If you enjoy collaborating in Agile/Scrum environments, value clean code ...

evolution of core Ruby on Rails operational platforms. Optimise PostgreSQL performance and Sidekiq background job efficiency. Manage secure third-party integrations and RESTful API design. Partner with Platform teams on AWS and CI/CD reliability. The Person: Deep experience with Ruby on Rails and OOP. Expert in PostgreSQL ...

stuck into some genuinely interesting engineering. Think computational complexity, mathematical optimisation, and performance challenges at scale - a long way from your average API job. Requirements: 7+ years experience developing and maintain scalable Python/FastAPI back-end services Ideally worked with high-performance APIs for complex hierarchical data queries … code Lead technical planning by breaking down roadmap items into scoped engineering work, driving ADRs and setting standards for code quality, testing, and API design Collaborate cross-functionally with front-end, data engineering, modelling and product teams to deliver reliable, impactful features Line-manage a team ...

. A non-trivial piece of work you can walk us through and explain well. Good fundamentals: sound data modelling (SQLAlchemy/Alembic), sensible API design, and an instinct for testing. Care where it counts: you treat correctness as a feature, because this code generates real prescriptions … family. How we hire We keep it short and respect your time: Intro call with our engineers (25-30 mins), including a short system-design chat. A conversation with our Director of Software Engineering (30 mins). A practical take-home task, in your own time. Onsite ...