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53 Contract API jobs in Hertfordshire + 20 miles
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Technical Product Manager API SaaS
Technical Product Manager API SaaS
Client Server
Shoreditch, East London (E1), EC2A
£95000 - £130000 per annum + benefits
You'll be embedded within delivery teams, UX and engineering and utilise your knowledge of software development to make trade-offs, steward the delivery process and close the gaps in requirements including producing technical documentation along with wireframes and API scaffolding where appropriate. Apply now to find out more about this Technical Product Manager (API SaaS) opportunity.
You'll be embedded within delivery teams, UX and engineering and utilise your knowledge of software development to make trade-offs, steward the delivery process and close the gaps in requirements including producing technical documentation along with wireframes and API scaffolding where appropriate. Apply now to find out more about this Technical Product Manager (API SaaS) opportunity.
PREMIUM
Java Developer Kafka API - Tech Consultancy
Java Developer Kafka API - Tech Consultancy
Client Server
City of London (EC2A), EC2A
£80000 - £90000 per annum
Java Developer / Backend Software Engineer (Kafka API) London / WFH to £90k
Java Developer / Backend Software Engineer (Kafka API) London / WFH to £90k
PREMIUM
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Java Engineer
Java Engineer
Profile 29
South East London (SE1)
From £40,000 to £90,000 per annum (DoE) + hybrid or remote working
Youll work across Camunda BPMN/DMN process automation, API integration, and microservice orchestration helping their public-sector clients build secure, scalable, and resilient digital services. Profile 29 recruitment keywords: Java software engineer object-oriented design OOD Camunda BPMN DMN Spring Boot REST API microservice architecture Docker Kubernetes containerisation orchestration Git CI/CD pipelines automated testing frameworks Kafka RabbitMQ Security authentication integration patterns enterprise systems agile digital transformation automation Java developer Camunda developer Zeebe Cloud AWS Azure GCP Terraform Helm process automation agentic AI artificial intelligence security clearance SC DV eDV London home based hybrid junior jnr
Youll work across Camunda BPMN/DMN process automation, API integration, and microservice orchestration helping their public-sector clients build secure, scalable, and resilient digital services. Profile 29 recruitment keywords: Java software engineer object-oriented design OOD Camunda BPMN DMN Spring Boot REST API microservice architecture Docker Kubernetes containerisation orchestration Git CI/CD pipelines automated testing frameworks Kafka RabbitMQ Security authentication integration patterns enterprise systems agile digital transformation automation Java developer Camunda developer Zeebe Cloud AWS Azure GCP Terraform Helm process automation agentic AI artificial intelligence security clearance SC DV eDV London home based hybrid junior jnr
NEW
Principle Java Engineer
Principle Java Engineer
Profile 29
South East London (SE1)
From £70,000 to £90,000 per annum + benefits + hybrid (or remote) work
Youll work across Camunda BPMN/DMN process automation, API integration, and microservice orchestration helping their public-sector clients build secure, scalable, and resilient digital services. Profile 29 recruitment keywords: Java software engineer object-oriented design OOD Camunda BPMN DMN Spring Boot REST API microservice architecture Docker Kubernetes containerisation orchestration Git CI/CD pipelines automated testing frameworks Kafka RabbitMQ Security authentication integration patterns enterprise systems agile digital transformation automation Java developer Camunda developer Zeebe Cloud AWS Azure GCP Terraform Helm process automation agentic AI artificial intelligence security clearance SC DV eDV London home based hybrid lead senior manager manage
Youll work across Camunda BPMN/DMN process automation, API integration, and microservice orchestration helping their public-sector clients build secure, scalable, and resilient digital services. Profile 29 recruitment keywords: Java software engineer object-oriented design OOD Camunda BPMN DMN Spring Boot REST API microservice architecture Docker Kubernetes containerisation orchestration Git CI/CD pipelines automated testing frameworks Kafka RabbitMQ Security authentication integration patterns enterprise systems agile digital transformation automation Java developer Camunda developer Zeebe Cloud AWS Azure GCP Terraform Helm process automation agentic AI artificial intelligence security clearance SC DV eDV London home based hybrid lead senior manager manage
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Software Developer - Full Stack
Software Developer - Full Stack
AWD Online
Hounslow (TW4)
From £35,000 to £40,000 per annum pro rata + Benefits
API Knowledge: Familiarity with RESTful APIs, microservices and integration patterns
API Knowledge: Familiarity with RESTful APIs, microservices and integration patterns
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Shape integration architecture across API led, event driven and microservices patterns
Shape integration architecture across API led, event driven and microservices patterns
Champion the use of strategic platforms such as ENSEK Ignition and shared integration/API frameworks.
Champion the use of strategic platforms such as ENSEK Ignition and shared integration/API frameworks.
PREMIUM
Hands on design and architecture experience with SAP technologies such as : S/4HANA Finance, SAP FICO (FI/CO), SAP CFIN, Enterprise integrations and API, SAP MDG - Finance master data management and exposure to non-SAP technologies such as Blackline etc.
Hands on design and architecture experience with SAP technologies such as : S/4HANA Finance, SAP FICO (FI/CO), SAP CFIN, Enterprise integrations and API, SAP MDG - Finance master data management and exposure to non-SAP technologies such as Blackline etc.
)
Strong technical expertise across Marketing Cloud including SQL, AMPscript, SSJS, Automation Studio and API integrations
Strong technical expertise across Marketing Cloud including SQL, AMPscript, SSJS, Automation Studio and API integrations
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Software Fundamentals: Background in solid software engineering practices (Git, testing, design patterns, API development via FastAPI/Flask).
Software Fundamentals: Background in solid software engineering practices (Git, testing, design patterns, API development via FastAPI/Flask).
FEATURED
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ServiceNow Developer- SC Security Clearance
ServiceNow Developer- SC Security Clearance
Morson Edge
Fenny Lock, Milton Keynes (MK1), MK1 1AS
£500 - 600 per day
• Strong knowledge of JavaScript, ServiceNow scripting, and ServiceNow API usage.
• Strong knowledge of JavaScript, ServiceNow scripting, and ServiceNow API usage.
PREMIUM
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Product Manager - IAM / CIAM
Product Manager - IAM / CIAM
Sanderson Recruitment
City of London (EC1), EC1
£650 - £700 per day + Umbrella engagement
Strong understanding of security concepts (e.g. web/API security, OAuth, IAM)
Strong understanding of security concepts (e.g. web/API security, OAuth, IAM)
FEATURED
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Integration & Automation Manager - Azure APIs
Integration & Automation Manager - Azure APIs
Randstad Digital
Watford (WD17)
£70000 - £90000 per annum
Azure API Management * Azure API Management experience.
Azure API Management * Azure API Management experience.
FEATURED
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API integration and automation
API integration and automation
FEATURED
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We're currently partnering with a leading organisation in the utilities sector that is undergoing significant investment in customer-facing technology and digital transformation. As part of this journey, we're looking to appoint an experienced Solution Architect to join a central architecture function supporting a broad portfolio of business-critical change initiatives. This role sits within the Customer domain and will play a key part in shaping and delivering technology solutions that improve customer experience, support operational excellence, and enable long-term business strategy. The successful candidate will work closely with business stakeholders, delivery teams, engineers, and technical specialists to define end-to-end solutions and provide architectural leadership throughout the delivery lifecycle. What you'll be doing -
We're currently partnering with a leading organisation in the utilities sector that is undergoing significant investment in customer-facing technology and digital transformation. As part of this journey, we're looking to appoint an experienced Solution Architect to join a central architecture function supporting a broad portfolio of business-critical change initiatives. This role sits within the Customer domain and will play a key part in shaping and delivering technology solutions that improve customer experience, support operational excellence, and enable long-term business strategy. The successful candidate will work closely with business stakeholders, delivery teams, engineers, and technical specialists to define end-to-end solutions and provide architectural leadership throughout the delivery lifecycle. What you'll be doing -
PREMIUM
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Lead Software Engineer
Lead Software Engineer
MARSH CORPORATE SERVICES LIMITED
City of London (EC3)
Pension, Medical, Life Insurance and much more
Strong backend engineering skills (API design, data modelling, performance) and experience building secure, role-based applications.
Strong backend engineering skills (API design, data modelling, performance) and experience building secure, role-based applications.
PREMIUM
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API Integration (OData ideally)
API Integration (OData ideally)
NEW
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Experience with infrastructure-as-code, production-grade Linux environments, and API services (Flask/Gunicorn).
Experience with infrastructure-as-code, production-grade Linux environments, and API services (Flask/Gunicorn).
FEATURED
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Contract Data Architect GCP
Contract Data Architect GCP
Crosstide
The City, City of London (EC3), EC3V 3NB
Very competitive day rate
Data Architect / Principal Data Engineer (GCP) Contract: Initial 3 Months - Location: Fully Remote - Status: Outside IR35 - We are looking for a highly experienced Data Architect / Principal Data Engineer with deep, hands-on GCP expertise to support a major data transformation programme within a regulated financial services environment. This is not an advisory role. We need someone who has personally designed, built and owned enterprise-scale GCP data platforms in production and can lead both architecture and delivery. Key Requirements * 7+ years' hands-on experience with Google Cloud Platform (GCP) o BigQuery - o Dataflow - o Pub/Sub - o Python - o APIs and containerised services * Strong data architecture experience, including conceptual, logical and physical data modelling * Experience establishing governance frameworks, metadata management, data quality standards and AI-ready data foundations
Data Architect / Principal Data Engineer (GCP) Contract: Initial 3 Months - Location: Fully Remote - Status: Outside IR35 - We are looking for a highly experienced Data Architect / Principal Data Engineer with deep, hands-on GCP expertise to support a major data transformation programme within a regulated financial services environment. This is not an advisory role. We need someone who has personally designed, built and owned enterprise-scale GCP data platforms in production and can lead both architecture and delivery. Key Requirements * 7+ years' hands-on experience with Google Cloud Platform (GCP) o BigQuery - o Dataflow - o Pub/Sub - o Python - o APIs and containerised services * Strong data architecture experience, including conceptual, logical and physical data modelling * Experience establishing governance frameworks, metadata management, data quality standards and AI-ready data foundations
FEATURED
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Full Stack .NET Web Developer
Full Stack .NET Web Developer
Association For Project Management
Saunderton Lee, Princes Risborough (HP27), HP27 9LE
From £50,000 to £55,000 per annum
Salary: £50,000- £55,000 per annum (depending on experience) 12-month Fixed Term Contract (Full time - 35 hours per week) Hybrid Working Home Based/Princes Risborough - Were Association for Project Management (APM). Were a professional membership organisation that sets the standards for the project profession. As a registered charity, we reinvest our surplus for the benefit of our members and the profession. We deliver education and develop qualifications. We conduct research and provide knowledge and resources. We run events and share best practice. We give people the opportunity to connect and provide community for our individual members and corporate partners, wherever they are. Above all, when doing so makes a difference, we challenge the status quo - Job Role Overview - An exciting opportunity has arisen for a Full Stack .NET Web Developer to join our Digital team on a fixed term ...
Salary: £50,000- £55,000 per annum (depending on experience) 12-month Fixed Term Contract (Full time - 35 hours per week) Hybrid Working Home Based/Princes Risborough - Were Association for Project Management (APM). Were a professional membership organisation that sets the standards for the project profession. As a registered charity, we reinvest our surplus for the benefit of our members and the profession. We deliver education and develop qualifications. We conduct research and provide knowledge and resources. We run events and share best practice. We give people the opportunity to connect and provide community for our individual members and corporate partners, wherever they are. Above all, when doing so makes a difference, we challenge the status quo - Job Role Overview - An exciting opportunity has arisen for a Full Stack .NET Web Developer to join our Digital team on a fixed term ...
)
We are seeking an experienced Data Architect to join our Group Technology team on a 6-month contract. You will help realise the value of the immense Connells Group data landscape for the benefit of customers, colleagues and the overall business. You will use your expertise to define, evolve and communicate the existing Estate Agency enterprise data architecture, to democratise safe access to consolidated and unified data, modelled to help engineering teams develop single customer and property views. The priority for this role will be in mapping the existing estate for CRM data, developing the relevant CDMs as part of Fabric Medallion architecture, and establishing robust bulk extract and ingest patterns to enable CRM integration. * CDM Data Architecture Ownership; with direction from the Enterprise Data Architect, define and maintain the organisations CDM data ...
We are seeking an experienced Data Architect to join our Group Technology team on a 6-month contract. You will help realise the value of the immense Connells Group data landscape for the benefit of customers, colleagues and the overall business. You will use your expertise to define, evolve and communicate the existing Estate Agency enterprise data architecture, to democratise safe access to consolidated and unified data, modelled to help engineering teams develop single customer and property views. The priority for this role will be in mapping the existing estate for CRM data, developing the relevant CDMs as part of Fabric Medallion architecture, and establishing robust bulk extract and ingest patterns to enable CRM integration. * CDM Data Architecture Ownership; with direction from the Enterprise Data Architect, define and maintain the organisations CDM data ...
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Principal Technical Lead
Principal Technical Lead
RSSB
The City, City of London (EC3), EC3M 5AD
Competitive salary aligned to public-interest and not-for-profit secto
Ensure engineering standards are followed across the team: coding conventions, API design, security practices, and code review processes. * Experience with API and application security.
Ensure engineering standards are followed across the team: coding conventions, API design, security practices, and code review processes. * Experience with API and application security.
FEATURED
Forward Deployed Engineer
Forward Deployed Engineer
MARSH CORPORATE SERVICES LIMITED
City of London (EC3R)
Pension, healthcare, life insurance and much more
Own features end-to-end - from data consumption and querying through API logic to client-facing UI, with minimal handoffs and high autonomy.
Own features end-to-end - from data consumption and querying through API logic to client-facing UI, with minimal handoffs and high autonomy.
PREMIUM
Senior C# Developer .Net AWS - Finance
Senior C# Developer .Net AWS - Finance
Client Server
Shoreditch, East London (E1), EC2A
£75000 - £90000 per annum + bonus + benefits
Senior C# Developer / Software Engineer (C# .Net AWS) London to £90k - Are you a technologist who enjoys contributing to technical discussions and using the best tool for the job? You could be progressing your career at a global, financial Market Data provider whilst enjoying a range of perks and benefits. As a Senior C# Developer you will collaborate with DevOps and Product Management within an Agile team environment working on a Greenfield Market Data platform. The platform has been built with C# deploying to AWS and requires high scalability and low latency - they currently handle 40 billion messages per day. You'll work across the full development lifecycle, from requirements and design through to production, providing subject matter expertise on the .Net stack and contributing to technical design discussions.
Senior C# Developer / Software Engineer (C# .Net AWS) London to £90k - Are you a technologist who enjoys contributing to technical discussions and using the best tool for the job? You could be progressing your career at a global, financial Market Data provider whilst enjoying a range of perks and benefits. As a Senior C# Developer you will collaborate with DevOps and Product Management within an Agile team environment working on a Greenfield Market Data platform. The platform has been built with C# deploying to AWS and requires high scalability and low latency - they currently handle 40 billion messages per day. You'll work across the full development lifecycle, from requirements and design through to production, providing subject matter expertise on the .Net stack and contributing to technical design discussions.
PREMIUM
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Senior Platform Engineer – Telephony / VoIP / Linux
Senior Platform Engineer – Telephony / VoIP / Linux
PiPcall
North London, London, N1 9AL
Up to £95,000 per annum
Are you a senior engineer who thrives on owning mission-critical platforms, solving complex real-time problems, and improving reliability at scale? PiPcall is looking for a Senior Platform Engineer to take technical ownership of our core telephony platform. This role is best suited to someone with strong Linux systems expertise, solid SIP / VoIP knowledge, and hands-on experience supporting production environments where performance, uptime, and troubleshooting depth really matter. Role snapshot: Senior Platform Engineer Telephony / VoIP / Linux | Full-time | Hybrid / Remote | Salary: Up to £95,000 per annum | Monday to Friday, 9:0018:00 - What Youll Be Doing - Own and continuously improve PiPcalls Linux-based telephony platform in production - Design, build, and support real-time voice services using FreeSWITCH and related SIP components
Are you a senior engineer who thrives on owning mission-critical platforms, solving complex real-time problems, and improving reliability at scale? PiPcall is looking for a Senior Platform Engineer to take technical ownership of our core telephony platform. This role is best suited to someone with strong Linux systems expertise, solid SIP / VoIP knowledge, and hands-on experience supporting production environments where performance, uptime, and troubleshooting depth really matter. Role snapshot: Senior Platform Engineer Telephony / VoIP / Linux | Full-time | Hybrid / Remote | Salary: Up to £95,000 per annum | Monday to Friday, 9:0018:00 - What Youll Be Doing - Own and continuously improve PiPcalls Linux-based telephony platform in production - Design, build, and support real-time voice services using FreeSWITCH and related SIP components
Related Jobs
Locations
- Shoreditch
- St James
- The City, City (EC3)
- Winnersh
- Fenny Lock
- Lower Heyford
- Maidenhead Thicket
- Moorgate
- New Town
- Saunderton Lee
- City of London
- Cambridge
- Reading
- Central London
- West End
- East London
- Farnborough
- Milton Keynes
- South East London
- South West London
- London
- Berkshire
- Cambridgeshire
- Buckinghamshire
- Hertfordshire
- Hampshire
- Northamptonshire
- Oxfordshire
- West Sussex
- Bedfordshire
- South East
- East Anglia
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