26 to 50 of 447 Permanent API Design Jobs

Core Platform Developer

Location
Greater London, England, United Kingdom
DeveloperApply: London, United Kingdom: Full time: Posted 11 Days Ago: JR100464## Job Description:**Role Overview**We are seeking a Core Platform Developer to help design and build shared engineering foundations used across the firm. This role is focused on backend and platform capabilities that improve how internal teams build … patterns, and increase the reliability of internal systems. This person should be comfortable working across multiple areas of the stack, from service frameworks and API enablement to observability, governance, and developer workflows. This is a high-ownership role within a global, fast-moving engineering environment.**Key Responsibilities*** Design ...

Technical Solution Architect

Hiring Organisation
Fruition Group
Location
London, United Kingdom
Employment Type
Permanent
genuine voice in product and architectural decisions. Expect a fast learning curve across technology, regulation, and market structure. What You'll Do Architecture & System Design Design secure, scalable distributed systems for regulated environments Define and evolve system architecture, APIs, and integration patterns Apply sound software design patterns … architectural principles Contribute to decisions on ledger and smart contract design Build in auditability, resilience, and operational robustness from the outset Distributed Ledger & Digital Assets Work directly with distributed ledger technology and smart contracts Help design models covering tokenised and natively digital assets Work on atomic settlement ...

Software Engineer, General

Location
Greater London, England, United Kingdom
solid engineer with 2-4 years of experience building backend systems and platform infrastructure. You write clean, well-abstracted code with proper design patterns and comprehensive test coverage. You're comfortable working on both the Compute Platform (multi-cloud orchestration, resource management) and Inference Platform (model serving, autoscaling) under … leads Implement features for multi-cloud orchestration, resource scheduling, model deployment pipelines, and autoscaling systems Write well-maintained, production-grade code with proper abstractions, design patterns, and comprehensive test coverage Contribute to low-level design (LLD) including service APIs, database schema design, data models, and component interactions ...

Backend Developer (Python)

Location
Greater London, England, United Kingdom
APIs and services that handle millions of requests daily.This role offers the opportunity to work on challenging problems including distributed systems, data processing, and API design. You'll collaborate with frontend engineers, data scientists, and infrastructure teams to deliver reliable, efficient backend solutions. Key Responsibilities Develop and maintain Python … based backend services and APIs Design and implement database schemas and data models Build scalable microservices architecture Integrate with third-party services and APIs Optimize application performance and database queries Write comprehensive tests and documentation Participate in code reviews and architectural discussions Collaborate with frontend teams on API ...

Team Lead Software Engineer

Location
Easthampstead, England, United Kingdom
problems stay real-scale. About This Role We're hiring a Team Lead who owns how a squad builds and ships, from architecture and API design through to delivery, reliability, and the growth and performance of the engineers on the team. You already use AI as part … APIs, and partner integrations that move money for Xe's customers. Set technical direction and lead the squad's hands‐on engineering work: architecture, API design, code for the hard parts, design reviews, code review standards, and leading the squad's response to production incidents. Own engineering ...

Customer Engagement Manager

Location
Greater London, England, United Kingdom
organizational readiness—not just technical implementation Translate business objectives into implementation strategies and communicate technical constraints in business language executives understand Technical Solution Design & Architecture Guidance Lead or co-lead design workshops with customer technical teams to architect end-to-end solutions: integration flows, data migration strategies, workflow … design Design integrations between Rocketlane and enterprise systems (NetSuite, Salesforce, Workday, SAP, HRMS, CRMs, data warehouses) Evaluate integration approaches and make build-vs-buy recommendations: native connectors, iPaaS platforms (Workato, Boomi), custom API development Review and validate solution designs created by Solution Architects; push back when designs ...

Lead Java Developer – Integration Services

Location
Glasgow, Scotland, United Kingdom
Purpose of the role To design, develop and improve software, utilising various engineering methodologies, that provides business, platform, and technology capabilities for our customers and colleagues. Accountabilities Development and delivery of high-quality software solutions by using industry aligned programming languages, frameworks, and tools. Ensuring that code is scalable … 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. Assistant Vice President Expectations To advise and influence decision making, contribute to policy development and take responsibility for operational effectiveness. Collaborate ...

Software Development Engineer III

Location
Greater London, England, United Kingdom
play a pivotal role in shaping our technical domain to power all Expedia Group’s brands and product lines. In this role, you will: Design and implement scalable, robust, and maintainable systems and services across multiple domains, with a focus on reliability and performance. Develop complex application logic, APIs … years of relevant professional experience. Strong software engineering fundamentals—data structures, and algorithms in Java or Kotlin, with familiarity across the JVM stack, system design, and distributed systems, and can understand highly complex systems, design moderately complex services, and guide integrations across teams within the business unit. Building ...

Manager - AI Tech Transformation - TC - FS

Location
Greater London, England, United Kingdom
help to build a better working world. The opportunity We are seeking a Manager, AI Architect specializing in generative AI to lead the design and delivery of GenAI solutions for our clients. This is a hands‐on delivery and technical management role: you will own the architecture … your solutions run reliably in production. You will work closely with client teams and communicate technical decisions clearly to project stakeholders. Your key responsibilities Design and Delivery of Engagements Own the architecture and technical delivery of a GenAI solution area or workstream, from design through production rollout. Lead ...

MuleSoft Developer

Location
Greater London, England, United Kingdom
Solution Architects and the Mulesoft team to implement MuleSoft's AnyPoint platform-based Integrations in order to support business requirements. The MuleSoft Developer will design, build, and maintain integrations for multiple on premises and cloud systems and must be capable of understanding business requirements, working with various business … Develop Integration Solutions Using MuleSoft Software Provide technical expertise in large, complex environments. Individual will be responsible to provide: Detailed requirements analysis Software/API design Development of API’s Development and execution of Testing Strategies Deployment of API’s using the companies CI/ ...

VP Platform - Engineering & Architecture

Location
Birmingham, England, United Kingdom
coherent, aligned and fit for purpose given the company strategy. 6x Delivery Performance: Architect application frameworks and patterns (e.g., modularity, high cohesion, spec-first API design) that enable a 6x improvement in product development cycles through agentic AI workflows. Commercial Delivery Support: Partner with product engineering to ensure … modernisation roadmap, using the "5Rs" framework (Rehost, Replatform, Refactor, Rewrite, Replace) to maximise EBITDA impact. Platform Services Delivery & Growth Acceleration Platform-as-a-Product: Design, build and deploy the engineering roadmap for the core platform fabric and the suite of self‐service platform products that abstract complexity and allow ...

Senior Software Engineer II

Location
Greater London, England, United Kingdom
scalable, production-grade AI systems in a regulated financial services environment. Location: UKor EU Hybrid/Remote: Remote (Ocasionaltravel required) Responsibilities AI Solution Development Design, build, and deploy AI/ML models and intelligent applications across SBS platforms Develop solutions leveraging: Machine Learning (ML) Natural Language Processing (NLP) Generative … capabilities into core banking, payments, and digital platforms Work closely with Product Managers, Architects, and Developers to embed AI into customer-facing solutions Support API development and microservices architecture for AI-driven features Data Engineering Collaboration Partner with data engineers to ensure data quality, availability, and pipeline integrity Work ...

Product Manager – Global Card Issuing Platform (BaaS)

Location
Greater London, England, United Kingdom
infrastructure that allows clients to launch card programs anywhere in the world through a single integration. You will be responsible for a unified Global API and SDK suite that abstracts the complexity of regional payment networks. Whether a client is launching in Europe, North America, or APAC, your product … will provide a consistent, white-label experience. You will drive both the technical \"how\" (API/SDK design) and the strategic \"where\" (global expansion and regional issuing setups). What you’ll do Unified Global API Strategy: Design and maintain a single, polymorphic API architecture ...

Senior Software Development Engineer

Hiring Organisation
Expedia
Location
London, UK
Employment Type
Full-time
with a growth mindset. We value our team culture and work together from the office three times a week. In this role, you will: Design, build, and maintain robust full stack applications and scalable services across multiple domains, applying deep technical expertise and architectural skills. Lead … development process, including system design, API design, and data modelling, ensuring quality and maintainability of solutions. Collaborate across engineering, product, and business teams to define requirements, deliver impactful features, and drive technology strategy. Mentor and guide engineers, fostering best practices in coding, testing, and operational excellence within ...

Back-End Engineer Trading: Blockchain.com in London

Location
Greater London, England, United Kingdom
work covers backend services for order management, market data processing, and trade lifecycle systems. The position requires professional experience building backend services, REST API design, SQL knowledge, and experience integrating internal or third-party services. Kotlin and Python are the preferred backend languages. The employer does not state … streams Work with product, frontend, and trading teams Contribute to architecture and technical decisions Technical Qualifications The qualification profile includes backend service development, REST API design, SQL, and internal or third-party service integration. Performance fundamentals, problem-solving, and communication skills are also required. WebSockets, event-driven systems ...

Consultant, Senior Consultant, Automation Test Engineer, Government and Public Sector

Location
Belfast City District, Northern Ireland, United Kingdom
real world. You’ll be trusted to make technical decisions, explore and implement new tools, and influence how our teams engineer quality from design through to production. You might find yourself: Designing, developing and maintaining production-quality software, test infrastructure and reusable engineering tools for APIs, microservices and front … applications. Applying software engineering principles such as modular design, clean code, design patterns, code review and appropriate automated testing. Designing scalable automation frameworks and libraries that improve testability, developer feedback and delivery speed. Embedding automated quality checks in CI/CD pipelines using tools such as Azure DevOps ...

Manager, Automation Test Engineer, Engineering, Government and Public Sector

Location
Belfast City District, Northern Ireland, United Kingdom
across our Government and Public Sector. If you already hold active UK SC clearance or are eligible (5+ years UK residency) and want to design, build, and test solutions that make an impact across the nation, we’d love to meet you. Connect to your career at Deloitte Deloitte … real world. You’ll be trusted to make technical decisions, explore and implement new tools, and influence how our teams engineer quality from design through to production. You might find yourself: Designing, developing and maintaining production-quality software, test infrastructure and reusable engineering tools for APIs, microservices and front ...

Senior Language Programmer

Location
Greater London, England, United Kingdom
/Verse boundary Work closely with language consumers to ensure an exceptional user experience Establish test workflows to validate improvements and prevent regressions Design and maintain the scripting interface to Unreal Engine, working in close collaboration with the Verse Language team and the broader UE engineering organization What … looking for Expert knowledge of C++17 or later Experience in compiler or toolchain development (e.g., compiler internals, VM design, Clang/LLVM, or linker/platform ABI specifics) Experience developing and optimizing large codebases, with the ability to make tradeoffs between usability, performance, and power Strong ability to reason ...

Junior Solutions Architect: Cloud & API Design

Location
Greater London, England, United Kingdom
real initiatives and develop hands-on expertise. You will collaborate with chief architects and engineers, translate requirements into technical specifications, and contribute to API design, data flows, and cloud deployment planning across AWS, Azure, and Google Cloud. #J-18808-Ljbffr ...

Director Data & Analytics API Experience - Data Services

Hiring Organisation
CME- Group
Location
Belfast, UK
Employment Type
Full-time
Director Data & Analytics API Experience - Data ServicesBackground: CME Group runs some of the world's largest and most important trading venues, including derivatives exchanges, FX/FI platforms. The trading participants include leading investment banks, hedge funds, proprietary trading firms, investment managers, and retail traders, as well as additional … stakeholders such as independent software vendors (ISVs) and data redistributors. To support our unique data and analytics products, we are now building a unified API-first distribution framework, simplifying consumption and value extraction. The Role: We are seeking a key stakeholder for the CMEG External Data-Analytics (DA) APIs ...

Director Data & Analytics API Experience - Data Services

Hiring Organisation
CME- Group
Location
London, UK
Employment Type
Full-time
Director Data & Analytics API Experience - Data ServicesBackground: CME Group runs some of the world's largest and most important trading venues, including derivatives exchanges, FX/FI platforms. The trading participants include leading investment banks, hedge funds, proprietary trading firms, investment managers, and retail traders, as well as additional … stakeholders such as independent software vendors (ISVs) and data redistributors. To support our unique data and analytics products, we are now building a unified API-first distribution framework, simplifying consumption and value extraction. The Role: We are seeking a key stakeholder for the CMEG External Data-Analytics (DA) APIs ...

Senior Machine Learning Scientist

Location
Greater London, England, United Kingdom
/B testing, directly impacting our business results. We collaborate closely with the analytics, product, and engineering teams. In this role, you will: Design, develop, and apply machine learning solutions to real-world personalization, product, and business problems, translating ambiguous opportunities into scalable models, experiments, and production-ready capabilities. … strong attention to measurable impact. Partner closely with engineers, product, and business stakeholders to integrate machine learning solutions into services and workflows, including system design, API design, and data modelling considerations where applicable. Use strong technical judgment to select appropriate methods, validate outcomes, and improve model performance ...

Director Data & Analytics API Experience - Data Services

Location
Greater London, England, United Kingdom
Background Director Data & Analytics API Experience - Data Services Background: CME Group runs some of the world’s largest and most important trading venues, including derivatives exchanges, FX/FI platforms. The trading participants include leading investment banks, hedge funds, proprietary trading firms, investment managers, and retail traders, as well … stakeholders such as independent software vendors (ISVs) and data redistributors. To support our unique data and analytics products, we are now building a unified API-first distribution framework, simplifying consumption and value extraction. The Role We are seeking a key stakeholder for the CMEG External Data-Analytics (DA) APIs ...

Java API Developer, Assistant Vice President

Hiring Organisation
State Street Bank
Location
London, England, United Kingdom
DescriptionRole Summary :We are seeking an experienced Java API Developer to join our Digital Asset development team. This is a hands‐on engineering role responsible for building and operating secure, resilient API services that power institutional digital asset capabilities—spanning digital custody, tokenization enablement, digital transfer agency … will work closely with cross-functional teams to build robust, scalable, and secure digital asset products that meet our business and technical requirements.Role Description:Design, develop, and maintain Java backend services and REST APIs that support digital asset product flows (custody, tokenization, TA, digital cash/settlement) and integrate ...

Full Stack Engineer

Location
Greater London, England, United Kingdom
work alongside architects, product stakeholders and delivery partners to ship software that brokers and analysts use every day.**Key Responsibilities:*** **Build Across the Stack:** Design, build and ship features end to end, from APIs and services through to responsive, accessible user interfaces.* **Cloud Native Delivery:** Develop and run cloud … usable, performant ways for brokers and analysts.* **AI-Enabled Development:** Build AI-enabled product features using patterns such as retrieval-augmented generation, tool and API integration, evaluation and human-in-the-loop design.* **AI-Assisted Engineering:** Use AI-assisted engineering tools such as Claude Code or Claude Cowork ...