7 of 7 Remote/Hybrid Contract API Design Jobs

COINS Technical Consultant

Hiring Organisation
Langham Recruitment
Location
United Kingdom
Employment Type
Contract
Contract Rate
£1000/day
Progress OpenEdge ABL SQL Transact Progress Page Designer COINS Application Dataset Creation COINS Functional & Module Knowledge COINS Data Lineage Mapping COINS Tables & Schema Knowledge API Design Principles REST APIs HTTP Methods (GET, POST, PUT, PATCH, DELETE) JSON Payload Design OpenAPI/Swagger API Versioning Pagination & Filtering … API Error Handling API Testing Desirable: Understanding of CVR (Cost Value Reconciliation) Construction ERP experience Experience working with enterprise integration platforms Contract Details: Outside IR35 100% Remote Initial 12-month contract Long-term programme roadmap (6-8 years) Contractors invited to propose their own day rate ...

Backend Engineer

Hiring Organisation
Robert Half Limited
Location
London, United Kingdom
Employment Type
Contract, Work From Home
systems that enable global commerce, while evolving an existing real-time platform to support new markets. You will address backend capacity constraints and help design a shared transaction and ledger layer used across multiple business lines. This is a hands-on senior engineering role requiring both high-quality delivery … strong technical leadership in ambiguous, high-scale environments. You will be expected to: Design scalable systems with correctness and failure modes considered from the outset Clarify and scope requirements before proposing solutions Make pragmatic trade-offs in system design, avoiding over-engineering Operate independently without reliance ...

Senior C# Engineer .NET 9, AWS Lambda, SQS, SNS Outside IR35

Hiring Organisation
Smart Sourcer Limited
Location
City of London, London, United Kingdom
Employment Type
Contract
Contract Rate
From £700 to £800 per day
Overview: Youll operate as the technical spearhead for a greenfield product build, reporting to the Director of Engineering. Expect deep backend engineering, distributed system design, and high-quality serverless delivery, plus the chance to adopt modern AI-assisted development practices as part of your workflow. What Youll Bring: Senior … ability to architect and lead distributed REST microservices at scale. Strong authority in AWS serverless engineering: Lambda-first mindset, hands-on experience with API Gateway, SQS, Step Functions, EventBridge and IAM. Deep data expertise across Aurora MySQL and DynamoDB: schema design, access patterns, indexing, query tuning, and pragmatic ...

Contract AI Software Engineer - DV Cleared

Hiring Organisation
NSD
Location
City of London, London, United Kingdom
Employment Type
Contract, Work From Home
Contract Rate
£450 - £650 per day
Experience with AWS or Azure Familiarity with Docker and Kubernetes Experience working in secure or highly regulated environments Strong understanding of software architecture and API design IT WOULD BE NICE FOR THE AI SOFTWARE ENGINEER TO HAVE. Experience with RAG pipelines and vector databases Knowledge of MLOps tooling ...

Net Developer

Hiring Organisation
Pontoon
Location
Bromley, London, United Kingdom
Employment Type
Contract
Contract Rate
£700 - £750/day
Develop and maintain high-quality software applications using .NET (4.5+/.NET Core) and Python. Collaborate with cross-functional teams to gather requirements and design effective solutions. Provide support to team members and stakeholders to ensure smooth project execution. Liaise with technical and business colleagues to understand functional requirements … deliver solutions that align with business objectives. Utilise your understanding of Web Services (REST, SOAP) to design and document APIs effectively. Work with MS SQL Server, including TSQL, SSIS, SSRS for database management and reporting. Utilise version control tools such as Git/Bitbucket and job scheduling tools like ...

.Net Developer

Hiring Organisation
Pontoon
Location
Bromley, Kent, England, United Kingdom
Employment Type
Contractor
Contract Rate
£700 - £750 per day
Develop and maintain high-quality software applications using .NET (4.5+/.NET Core) and Python. Collaborate with cross-functional teams to gather requirements and design effective solutions. Provide support to team members and stakeholders to ensure smooth project execution. Liaise with technical and business colleagues to understand functional requirements … deliver solutions that align with business objectives. Utilise your understanding of Web Services (REST, SOAP) to design and document APIs effectively. Work with MS SQL Server, including TSQL, SSIS, SSRS for database management and reporting. Utilise version control tools such as Git/Bitbucket and job scheduling tools like ...

Fullstack JavaScript Developer

Hiring Organisation
Opus Recruitment Solutions Ltd
Location
New Works, Telford, Shropshire, England, United Kingdom
Employment Type
Contractor
Contract Rate
£500 - £550 per day
Essential Experience: React Next.js Strong commercial experience developing scalable backend systems using TypeScript and Node.js. Deep understanding of software architecture, API design, integration patterns and modern engineering best practices. Experience working with high-volume data platforms, data integrations and large-scale data migrations. Exposure to Databricks integrations would ...