13 of 13 Part-Time API Design Jobs in the UK

Solution Architect (London)

Hiring Organisation
Solirius Reply
Location
London, UK
Employment Type
Part-time
sector clients, helping to deliver Solirius’ services to the highest standard. \n The role will involve working with multiple business stakeholders, helping them to design business solutions which will then be implemented by the delivery teams. \n As a Solution Architect, you will be expected to operate with … require innovative thinking, applying best practices and emerging technologies to solve complex business problems in creative and pragmatic ways. \n Requirements Key Responsibilities: \n Design end-to-end solution architectures that meet business, technical, and security requirements. Translate business and technical requirements into scalable, secure, and cost-effective designs. ...

Lead Software Engineer - SDET (London)

Hiring Organisation
J.P. Morgan
Location
London, UK
Employment Type
Part-time
your career while helping us deliver exceptional solutions. \n As a Lead Software Development Engineer in Test (SDET) in our technology team, you will design, build, and support automated testing frameworks for backend applications. You will collaborate closely with developers and engineers to ensure robust, scalable, and reliable systems. … driving innovation and efficiency within our testing processes. Together, we foster a culture of learning, teamwork, and excellence. \n Job Responsibilities: \n \n Design and support automated testing frameworks for backend applications \n Develop and maintain test scripts using Python3 and pytest \n Implement and validate REST API ...

Software Engineer III (UI) - Digital Markets Execution Technology (DMET), Execute (London)

Hiring Organisation
J.P. Morgan
Location
London, UK
Employment Type
Part-time
this role. \n JOB DESCRIPTION \n As a Software Engineer III at JPMorganChase, you serve as a seasoned member of an agile team to design and deliver trusted market-leading technology products in a secure, stable, and scalable way. You are responsible for carrying out critical technology solutions across … measured by resiliency, usability, and speed of delivery in a highly operational, business-critical environment. \n Job Responsibilities\n \n Executes software solutions, design, development, and technical troubleshooting with ability to think beyond routine or conventional approaches to build solutions or breakdown technical problems \n Creates secure and high ...

UI Senior Lead Software Engineer - Commodities (London)

Hiring Organisation
J.P. Morgan
Location
London, UK
Employment Type
Part-time
This role emphasizes engineering excellence, operational readiness, and secure, compliant delivery in a fast-paced global environment. \n Job Responsibilities \n \n Lead the design and delivery of user interface capabilities across Execute, from discovery to production support \n Set front-end technical direction, including architecture, standards, performance … setting standards, leading designs, and directly managing or mentoring small teams of mid-level engineers \n Solid software engineering fundamentals, including OO/design patterns, debugging, and documentation \n Familiarity with agentic development approaches across the software development lifecycle \n Strong communication and people skills, with the ability ...

Lead Software Engineer (Belfast)

Hiring Organisation
Kainos
Location
Belfast, UK
Employment Type
Part-time
product or software project, including architecture, estimation, product planning and user story/requirement creation \n \n\n \n \nExpertise in software design and development across all layers of an application, including API design, data pipelines, and front-end integration \n \n\n \n \nWe are passionate ...

Lead Software Engineer (UI) - Digital Markets Execution Technology (DMET), Execute (London)

Hiring Organisation
J.P. Morgan
Location
London, UK
Employment Type
Part-time
This role emphasizes engineering excellence, operational readiness, and secure, compliant delivery in a fast-paced global environment. \n Job Responsibilities \n \n Lead the design and delivery of user interface capabilities across Execute, from discovery to production support \n Set front-end technical direction, including architecture, standards, performance … data-intensive user experiences \n Demonstrated technical leadership in setting standards, leading designs, and mentoring teams \n Solid software engineering fundamentals, including OO/design patterns, debugging, and documentation \n Familiarity with agentic development approaches across the software development lifecycle \n Strong communication skills and ability to work effectively ...

Software Development Engineer III (London)

Hiring Organisation
Tesco
Location
London, UK
Employment Type
Part-time
technical leadership by designing shared GenAI capabilities, supporting live systems and raising engineering and AI delivery standards across the team through mentoring and rigorous design practice. \n \n Data & AI Product Development: Take ideas from discovery through rapid prototypes to production grade solutions that combine data, user facing applications … backend services. \n Work closely with product managers, designers, data science and engineering teams to translate business needs into well designed technical solutions. \n Design and deliver LLM based applications and AI agents that enable intelligent decision making and automation, applying pragmatic engineering patterns and appropriate guardrails. \n Design ...

Machine Learning Engineer (London)

Hiring Organisation
Baringa Partners
Location
London, UK
Employment Type
Part-time
using Python and common ML and DL libraries (e.g. Pytorch, Tensorflow) from early conceptualisation to full deployment in scalable production environments \n Ability to design, deploy and maintain ML solutions on modern frameworks to meet functional business requirements, adhering to software engineering best practices and with exposure to version … control, testing, MLOps, CI/CD and API design \n Hands on experience in using one of 3 major cloud technologies (AWS, Azure or GCP) in a production environment, as well as ML platforms (e.g., AWS Sagemaker, Azure Machine Learning studio) \n Be a ‘lifelong learner ...

Senior iOS Developer - 6 Month FTC (London)

Hiring Organisation
Moneybox
Location
London, UK
Employment Type
Part-time
What you’ll do\n \n Technical Ownership: Lead and deliver streams of work end-to-end, taking ownership from initial requirements and API design through to store release and post-release monitoring. \n Platform Evolution: Partner with mobile leadership to shape the technical direction … while confidently navigating and migrating legacy UIKit components. \n Cross-Functional Collaboration: Work closely with Product Managers to define features, Backend engineers to design RESTful APIs, and UI/UX designers to bring high-fidelity interfaces to life. You will also collaborate with the Android team to ensure feature ...

Tech Lead (London) (London)

Hiring Organisation
AND Digital
Location
London, UK
Employment Type
Part-time
peer reviews. \n\n 3. Stakeholder Management\n \n Collaborative Influence: Navigate a multi-faceted stakeholder landscape. You’ll be equally comfortable discussing API design with engineers as you are discussing roadmap priorities and business value with Product Owners and Senior Executives. \n\n What You’ll Bring ...

Principal Engineer (Backend focus -Java) (London)

Hiring Organisation
AND Digital
Location
London, UK
Employment Type
Part-time
peer reviews. \n\n 3. Stakeholder Management\n \n Collaborative Influence: Navigate a multi-faceted stakeholder landscape. You’ll be equally comfortable discussing API design with engineers as you are discussing roadmap priorities and business value with Product Owners and Senior Executives. \n\n What You’ll Bring ...

Full-Stack Developer (Manchester)

Hiring Organisation
BNY
Location
Manchester, UK
Employment Type
Part-time
observability, and reliability. \n 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. \n Partner with product, design, and operations to translate outcomes into measurable … distributed systems and microservices in agile environments (Scrum/Kanban). \n Deep Java experience (Spring), architectural patterns for scalable, observable, testable systems; strong API design. \n Strong DevOps practices: CI/CD (e.g., GitLab), automated testing (JUnit/Spock), code reviews, telemetry/observability (Splunk, AppDynamics), containers (Docker ...

Engineering and Architecture Lead - Talent Pool (London)

Hiring Organisation
BNY
Location
London, UK
Employment Type
Part-time
role is located in London or Manchester. \n In this role, you’ll make an impact in the following ways: \n \n Lead architecture design and review across multiple pods, ensuring best practices and high-quality solutions. \n Mentor junior developers on software design, clean code … functional requirements including performance, scalability, resiliency, and recoverability. \n Promote modern development practices such as reactive/non-blocking programming and contract-first API design. \n Present architecture designs to stakeholders at various levels. \n Promote successful adoption of AI Software Development tooling. \n\n To be successful ...