101 to 125 of 130 API Design Jobs in England

Senior Software Engineer

Hiring Organisation
Formula Recruitment
Location
City of London, London, United Kingdom
maintainable code. This is an exciting opportunity to join collaborative and innovative startup with opportunities for professional growth and learning. What You’ll Do Design and develop high-throughput, low-latency APIs using Typescript/Node.js. Build and maintain real-time data ingestion and processing pipelines. Optimise backend services … delivery. Collaborate with front-end teams to power trading consoles and dashboards. Profile and tune Node.js applications for performance and memory efficiency. Ensure secure API design and compliance with data privacy regulations. Contribute to architecture discussions, code reviews, and documentation. Key requirements Strong experience with Node.js in production ...

Mobile App Experience Layer Engineer

Hiring Organisation
ARM
Location
Stratford, London, United Kingdom
Employment Type
Contract
Contract Rate
£508 - £548/day Inside IR35
Experience - Java/Kotlin with Spring and Spring Boot - Google Cloud Platform (Cloud Run, Pub/Sub, Secret Manager) - Observability tools (Grafana, Splunk) - REST API design - TDD, pair programming, mobbing - Strong communication and mentoring - Git Preferred Experience - DevOps/CI/CD - Load & performance testing - Mobile integration experience ...

Senior Developer

Hiring Organisation
Reed.co.uk
Location
London, South East, England, United Kingdom
Employment Type
Contractor
Contract Rate
£80,000 per annum
development experience. Proven success in high-performing engineering teams in fast-paced environments. Deep expertise in development with: Python (Django, Flask, or FastAPI) PostgreSQL (design, optimisation, maintenance) Containerisation (Docker/Kubernetes) Event-driven architecture (Kafka/RabbitMQ) Nice to have experience with: TypeScript/JavaScript (NextJS, NodeJS, Tailwind) Terraform … DevOps Experience building and scaling SaaS platforms in production. Strong background in software architecture, microservices, and API design. Hands-on experience with AWS platform. Track record of delivering high-quality software under tight timelines. Strong communication skills, able to motivate and align technical teams. Experience with AI tools, APIs ...

Senior Test Engineering Manager Automation-First

Hiring Organisation
Salt Search
Location
London, South East, England, United Kingdom
Employment Type
Contractor
Contract Rate
£480 - £500 per day
automated testing into CI/CD pipelines so quality is continuous and enforced Upskill and mentor test engineers and software engineers in automation, test design, and quality engineering Establish quality standards, best practices, and governance without slowing teams down Reduce manual testing, flaky automation, and release risk Partner with … engineering leadership to raise overall engineering maturity Influence system and API design to improve testability, resilience, and maintainability Essential experience A software engineer at heart with senior test engineering leadership experience Proven track record of creating and evolving test strategies, not just executing them Experience building and scaling ...

Salesforce Engineer

Hiring Organisation
Experis
Location
Knutsford, Cheshire, United Kingdom
Employment Type
Contract
delivery-focused technology team. The role requires strong hands-on development capability across Salesforce and Java, with a clear emphasis on modern engineering practices, API design, and test-driven development. This position is suited to a senior engineer who is comfortable working within CI/CD-driven environments … contributing to high-quality, scalable enterprise solutions. Key Responsibilities Design, develop, and maintain Salesforce-based solutions using Java and modern engineering practices Build and consume RESTful APIs, ensuring robust and secure integrations Apply Test-Driven Development (TDD) and Behaviour-Driven Development (BDD) approaches where applicable Produce and maintain OpenAPI ...

Data Engineer

Hiring Organisation
Morson Edge (Technology)
Location
London Area, United Kingdom
looking for a Data Engineer who will design and implement customer data solutions that enable personalised experiences while ensuring privacy, quality, and accessibility of customer information across all touchpoints. Length: 12 months Location: London, UK Environment: Hybrid - 2-3 days in the office Key responsibilities: Leading engineering decisions … marketing and engagement platforms What is required to be successful in this role: Deep expertise in data engineering, including real-time data processing, API design and distributed systems Strong proficiency with cloud platforms (e.g. AWS, GCP, Azure), infrastructure-as-code, and scalable architecture patterns Hands-on experience with ...

Android Technical Lead

Hiring Organisation
RealityMine
Location
Trafford Park, Greater Manchester, UK
Android apps and SDKs. The Role: This is a hands‐on role where you will: · Lead the technical direction for our Android solutions · Design and implement complex features, working with Kotlin, Java and C NDK to build reliable, high‐performance components · Stay ahead of Android OS & Google Play changes … lead our response to them · Collaborate with product, data, and client teams to deliver robust solutions · Mentor other engineers, run design and code reviews, and champion best practices · Leverage and be open to AI-coding tools to increase productivity, reduce boilerplate and enhance code quality Our offices ...

Android Technical Lead

Hiring Organisation
RealityMine
Location
Trafford Park, England, United Kingdom
Android apps and SDKs. The Role: This is a hands‐on role where you will: · Lead the technical direction for our Android solutions · Design and implement complex features, working with Kotlin, Java and C NDK to build reliable, high‐performance components · Stay ahead of Android OS & Google Play changes … lead our response to them · Collaborate with product, data, and client teams to deliver robust solutions · Mentor other engineers, run design and code reviews, and champion best practices · Leverage and be open to AI-coding tools to increase productivity, reduce boilerplate and enhance code quality Our offices ...

Technical Data Architect

Hiring Organisation
Harnham - Data & Analytics Recruitment
Location
London, South East, England, United Kingdom
Employment Type
Full-Time
Salary
£80,000 - £95,000 per annum
digital content platform, shaping cloud infrastructure, data models, integrations, APIs and security across the solution. You'll work closely with the platform provider to design and govern a scalable architecture built on modern cloud services such as AWS, Azure or GCP, ensuring reliability, performance and compliance. A key responsibility … schemas and metadata structures, partnering with Solutions Architects to ensure all onboarding aligns with industry best practices. You'll champion best-practice patterns across API design, integration layers, authentication, data pipelines and cloud-native services, with hands-on involvement in troubleshooting and implementation support. The role also produces ...

Product Manager - Payments

Hiring Organisation
X4 Technology
Location
London Area, United Kingdom
customer experience Change Delivery & Product Development Lead regulatory and scheme-driven change initiatives (e.g., ISO 20022 migration, fraud initiatives) Define backend requirements, support API design, and evolve transaction processing infrastructure Maintain vendor and scheme relationships to ensure SLAs are met and performance is optimised What We’re Looking … knowledge of UK payment systems (FPS, Bacs, COP) and regulations (PSD2, PSR, FCA, PRA, Bank of England) Comfortable writing requirements for backend teams, designing API specs, and understanding messaging flows, reconciliation, and reporting. Strong SQL skills are required, with the ability to write complex queries for data analysis, troubleshooting ...

Lead AI Automation Engineer

Hiring Organisation
BD Talent Limited
Location
Warrington, Cheshire, North West, United Kingdom
Employment Type
Permanent
Salary
£65,000
comfortable working as the first and currently only tech specialist and someone with experience across: Workflow automation platforms (e.g., Make, n8n, Zapier, Workato) API design, integration, authentication Python, JavaScript or similar scripting languages AI/ML models (LLMs, embeddings, classification, summarisation) Data wrangling and ETL tools Cloud platforms … Automation. Just imagine how content you could be in a role with masses of autonomy that requires you to challenge yourself and design solutions to help businesses operate better and in turn, overcome any market challenges they may face. One for you? If so apply now, wed love ...

IT Integration Architect

Hiring Organisation
DGH Recruitment
Location
City of London, London, United Kingdom
Employment Type
Permanent, Work From Home
Salary
£95,000
that supports business critical functions across the business. My client have migrated significant services to the cloud and now requires a lead architect to design and build the next generation of solutions including core finance and HR technology landscape, automating data flows, integrating systems, supporting in the delivery … real-time reporting and analysis, whilst driving a more mature awareness to data architecture and governance across the business. Responsibilities: - Lead the design and delivery of integrations across technology platforms and solutions. - Produce architectural documentation (HLDs, LLDs, diagrams, support guides). - Ownership of integration and application architecture in alignment ...

Product Engineer

Hiring Organisation
SR2 | Socially Responsible Recruitment | Certified B Corporation™
Location
London Area, United Kingdom
product managers, engineers, and end users to understand new customer use cases Turn those use cases into reusable platform capabilities , rather than bespoke solutions Design and build scalable data models, workflows, and abstractions that work across multiple customers Build and extend AI-enabled workflows as part of the core … fully specified Nice to Have (Not Essential) Experience with modern data platforms (e.g. Databricks, Snowflake, dbt, Airflow, Foundry) Some exposure to backend development or API design TypeScript experience Familiarity with enterprise systems (ERP, CRM, etc.) Exposure to AI-enabled systems , generative AI, or workflow orchestration ...

Senior Android Engineer - Hybrid, £100K

Hiring Organisation
Oliver Bernard
Location
City of London, London, United Kingdom
share code with iOS. You’ll be joining a collaborative engineering group working on major new features, shaping technical discussions, influencing architecture and API design, and helping to evolve a category-defining product used across the UK, US and several new international markets launching in 2026. What they ...

Junior Full Stack Developer

Hiring Organisation
Proactive Appointments
Location
London, South East, England, United Kingdom
Employment Type
Full-Time
Salary
£30,000 - £38,000 per annum
/Junior Full Stack Developer to join their team on a permanent basis. This role focuses on building and optimising JavaScript applications with strong API design and architecture. If you’re passionate about technology and continuous learning, the organisation can offer excellent career growth, competitive compensation, and great ...

CTO

Hiring Organisation
Leo Technology
Location
Petersfield, Hampshire, South East, United Kingdom
Employment Type
Permanent, Work From Home
Seed to Series A) Hands-on expertise with OpenAI integrations or other LLM-based solutions Technical experience with Node.js, Python, and SQL Experience with API design and development for both internal and external use cases Knowledge of ISO/compliance Experience designing and scaling data pipelines and working ...

Senior Software Developer

Hiring Organisation
Reed
Location
Holborn, London, England, United Kingdom
Employment Type
Full-Time
Salary
£70,000 - £80,000 per annum, Inc benefits
commercial software development experience. Proven success in high-performing engineering teams within fast-paced environments. Deep expertise in: Python (Django, Flask, or FastAPI) PostgreSQL (design, optimisation, maintenance) Containerisation (Docker/Kubernetes) Event-driven architecture (Kafka/RabbitMQ) Desirable experience includes: TypeScript/JavaScript (NextJS, NodeJS, Tailwind) Terraform and DevOps … practices Experience in building and scaling SaaS platforms in production. Strong background in software architecture, microservices, and API design. Hands-on experience with AWS platform. Excellent communication skills, capable of motivating and aligning technical teams. Experience with AI tools, APIs, or ML pipelines is highly desirable. Bonus: Exposure ...

VP of AI Platform Engineering

Hiring Organisation
Wenham Carter
Location
England, United Kingdom
lead the technical strategy to embed AI-driven orchestration across their software portfolio. This is a hands-on senior leadership role: you will design the platform, own non-functional requirements (reliability, security, scalability, compliance), drive adoption internally and externally, and build a small, high-performing global team that moves … start-up mentality. What you’ll do Define and deliver the Core AI Services platform (orchestration, APIs, SDKs, integration toolkits). Lead the design and delivery of AI-driven orchestration layers across the software portfolio. Own platform non-functional attributes: security, reliability, availability, compliance, and global scale. Lower barriers ...

Security Architect

Hiring Organisation
Macildowie Recruitment and Retention
Location
Solihull, West Midlands, England, United Kingdom
Employment Type
Full-Time
Salary
£70,000 - £82,000 per annum
role in designing, assuring and evolving secure technology solutions across the enterprise. This is a senior technical role where security is embedded by design and by default, enabling innovation while protecting confidentiality, integrity and availability of information assets. About The Security Architect Role: As Security Architect, you will … regulatory requirements into practical, scalable security architectures across systems, platforms and integrations. Key Responsibilities: Define, maintain and evolve security architecture principles, standards and patterns Design and assure security controls for new and existing systems, platforms and integrations Conduct security architecture reviews, risk assessments and threat modelling Provide pragmatic guidance ...

Mulesoft Developer

Hiring Organisation
Bridge Recruitment UK Limited
Location
Central London, London, United Kingdom
Employment Type
Permanent, Work From Home
Salary
£75,000
Salesforce MuleSoft Developer (Hybrid Role) Were looking for an experienced Salesforce MuleSoft Developer to design, build, and maintain integrations between Salesforce and external systems. Youll work closely with cross-functional teams to deliver scalable, high-performance integration solutions aligned with business needs. What youll do: Design, develop, test … 3+ years Salesforce experience Strong background in software development and OOP Hands-on MuleSoft & Salesforce integration experience MuleSoft certification(s) Solid understanding of API design and integration best practices Bachelors degree in Computer Science, Engineering, or related field Salesforce ecosystem experience is a strong plus. ...

Backend Engineer

Hiring Organisation
Harnham - Data & Analytics Recruitment
Location
London, South East, England, United Kingdom
Employment Type
Full-Time
Salary
£60,000 - £80,000 per annum
TypeScript will be valuable for occasional UI enhancements and bridging front-end requirements. Collaboration with cross-functional teams to implement best practices in API design, security, and performance tuning will be central to success. Additionally, you'll contribute to code reviews, documentation, and continuous improvement initiatives to maintain ...

Senior iOS Engineer / iOS Technical Lead (Hands-on)

Hiring Organisation
Circle Group
Location
Manchester, North West, United Kingdom
Employment Type
Permanent, Work From Home
Salary
£60,000
stability, correctness and long-term maintainability really matter. Day to day, you will: Own the architecture and technical direction of iOS apps and SDKs Design and build complex features using Swift, with some Objective-C and C++ Tackle challenges around networking, performance, stability and edge cases Stay ahead … Apple platform changes, shaping how the team responds Support SDK integrations and help resolve tricky production issues Run design and code reviews, and help raise engineering standards Make pragmatic use of modern tooling, including AI-assisted development tools, to improve quality and reduce busywork Who this role suits This ...

Solutions Architect

Hiring Organisation
Method-Resourcing
Location
St. Albans, Hertfordshire, United Kingdom
Employment Type
Permanent
Salary
GBP 95,000 Annual
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 click apply for full job details ...

Senior MuleSoft Consultant

Hiring Organisation
Alscient
Location
Leeds, England, United Kingdom
skilled and experienced Senior MuleSoft Consultant to join our growing team. The successful candidate will be responsible for leading MuleSoft projects responsible for the design, development and integration solutions that connect Salesforce with enterprise systems, cloud applications and data services. Why Alscient We are experts in digital transformation … providing solution input when required and able to lead on a variety of customer engagements. Key Responsibilities Include: Lead the end-to-end design and delivery of MuleSoft APIs, integrations, event-driven flows, and orchestration layers, ensuring performance, scalability, error handling and monitoring. Architect robust integration solutions connecting Salesforce ...

Senior Software Engineer - Backend

Hiring Organisation
Fruition Group
Location
Leeds, West Yorkshire, Yorkshire, United Kingdom
Employment Type
Permanent
Salary
£70,000
large-scale software platform. Working across multiple teams to ensure alignment and scalability throughout the business. Set technical direction and contribute to key design decisions across teams. Lead by example, writing high-quality, maintainable code in Node.js and TypeScript. Design and optimise CI/CD pipelines, improving automation … robust services. Mentor and coach engineers, helping to raise the overall bar for backend development. Drive best practices in platform engineering, cloud infrastructure, and API design. Key requirements: 5+ years' experience in backend or platform engineering roles, with recent experience at senior Level. Deep hands-on expertise with Node.js ...