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170 Contract API jobs in Hertfordshire + 20 miles
£80000-100000 GBP - Equity - Hybrid WORKING - Location: Central London, Greater London - United Kingdom Type: Permanent - London (4 days onsite) £80,000 to £100,000 base plus package - A high-growth B2B fintech scale-up transforming how complex industries handle payments and financial workflows are growing their engineering team! They're profitable, well-funded, and engineering-led, and as their newest Engineer you'll shape their core platform and take ownership of critical features. This is a hands-on senior role where you can influence the technical direction, own features and build software that has a real impact. * Build and scale end-to-end features across the full stack using .NET and React * Work with SQL and NoSQL databases to deliver robust, high-performance solutions * Design, maintain and optimise cloud-based services on AWS, GCP or Azure
£80000-100000 GBP - Equity - Hybrid WORKING - Location: Central London, Greater London - United Kingdom Type: Permanent - London (4 days onsite) £80,000 to £100,000 base plus package - A high-growth B2B fintech scale-up transforming how complex industries handle payments and financial workflows are growing their engineering team! They're profitable, well-funded, and engineering-led, and as their newest Engineer you'll shape their core platform and take ownership of critical features. This is a hands-on senior role where you can influence the technical direction, own features and build software that has a real impact. * Build and scale end-to-end features across the full stack using .NET and React * Work with SQL and NoSQL databases to deliver robust, high-performance solutions * Design, maintain and optimise cloud-based services on AWS, GCP or Azure
PREMIUM
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C# .NET Software Developer with FX and Fixed Income
C# .NET Software Developer with FX and Fixed Income
Nexus Jobs
City of London (EC1)
From £80,000 to £100,000 per annum
Our Client is a niche boutique broker specialising in FX. They are looking to recruit a C# .NET Software Developer with at least 3 to 5 years proven track record of developing with C# .NET. The Client would like meet candidates ideally with some understanding Trading Floor projects to include Fixed Income, Risk Management, Swap Options and FX. You need to be resilient as you will be working closely with traders and developing financial trading systems so an understanding of FX instruments would be very useful. The Company is a fast growing dynamic brokerage firm, specialising in currency options and interest rate swaps. They are seeking a talented technologist to join the London team. You will be working in a fast paced, delivery focused environment where you will get the opportunity to make a genuine impact on the business rather than just making up the numbers.
Our Client is a niche boutique broker specialising in FX. They are looking to recruit a C# .NET Software Developer with at least 3 to 5 years proven track record of developing with C# .NET. The Client would like meet candidates ideally with some understanding Trading Floor projects to include Fixed Income, Risk Management, Swap Options and FX. You need to be resilient as you will be working closely with traders and developing financial trading systems so an understanding of FX instruments would be very useful. The Company is a fast growing dynamic brokerage firm, specialising in currency options and interest rate swaps. They are seeking a talented technologist to join the London team. You will be working in a fast paced, delivery focused environment where you will get the opportunity to make a genuine impact on the business rather than just making up the numbers.
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Senior Software Engineer .NET React
Senior Software Engineer .NET React
Anson Mccade
South East London (SE1)
From £80,000 to £105,000 per annum
Senior Software Engineer (Early-Stage SaaS | .NET & React)?? London | ?? On-site | ?? Full-time | ?? Up to £100k + equity - The Role - A fast-growing startup is building a financial operations platform and is looking for a hands-on Senior Software Engineer. Youll help build the product from the ground up, own key features, and have a real influence on both the technology and the direction of the platform. What Youll Do * Build new features across the backend and frontend * Work with .NET and a modern JavaScript framework (React used internally) * Help shape the architecture as the platform scales * Work closely with founders, engineers and product teams * Take ideas from concept to production - What You Need * Experience building software with .NET or another modern backend language * Experience with JavaScript/TypeScript on the frontend * Comfortable working with API
Senior Software Engineer (Early-Stage SaaS | .NET & React)?? London | ?? On-site | ?? Full-time | ?? Up to £100k + equity - The Role - A fast-growing startup is building a financial operations platform and is looking for a hands-on Senior Software Engineer. Youll help build the product from the ground up, own key features, and have a real influence on both the technology and the direction of the platform. What Youll Do * Build new features across the backend and frontend * Work with .NET and a modern JavaScript framework (React used internally) * Help shape the architecture as the platform scales * Work closely with founders, engineers and product teams * Take ideas from concept to production - What You Need * Experience building software with .NET or another modern backend language * Experience with JavaScript/TypeScript on the frontend * Comfortable working with API
PREMIUM
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12 months - Remote - Inside IR35 - Umbrella only - Active SC clearance required - As a Salesforce Developer, you will lead the development of custom solutions on the Salesforce platform. You will be responsible for writing Apex code, creating visual force pages, and implementing integrations. You will have a strong understanding of the Salesforce platform and experience leading successful projects. A Senior Salesforce Developer will have a deep understanding of the Salesforce platform and the ability to develop complex solutions, mentor and lead the development team, troubleshoot and provide technical support to clients. They will also have a solid understanding of web development concepts and languages and keep up-to-date with new Salesforce features and best practices. * Skilled in Apex, HTML, JavaScript (ES6+), CSS, SLDS, and Salesforce DX.
12 months - Remote - Inside IR35 - Umbrella only - Active SC clearance required - As a Salesforce Developer, you will lead the development of custom solutions on the Salesforce platform. You will be responsible for writing Apex code, creating visual force pages, and implementing integrations. You will have a strong understanding of the Salesforce platform and experience leading successful projects. A Senior Salesforce Developer will have a deep understanding of the Salesforce platform and the ability to develop complex solutions, mentor and lead the development team, troubleshoot and provide technical support to clients. They will also have a solid understanding of web development concepts and languages and keep up-to-date with new Salesforce features and best practices. * Skilled in Apex, HTML, JavaScript (ES6+), CSS, SLDS, and Salesforce DX.
FEATURED
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Solution Architect
Solution Architect
Henderson Scott
North West London, London, NW1 7AW
£70000.00 - £75000.00 per annum + Highly Remote, 30 days AL+BH
Maintain and enforce standards for API design, integration patterns, data schemas (including Medallion architecture), and security (RBAC, data classification).
Maintain and enforce standards for API design, integration patterns, data schemas (including Medallion architecture), and security (RBAC, data classification).
FEATURED
Strong understanding of RESTful API integration, authentication, and security practices.
Strong understanding of RESTful API integration, authentication, and security practices.
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Rest API
Rest API
FEATURED
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Technical Architect, Azure
Technical Architect, Azure
ARC IT Recruitment Ltd
The City, City of London (EC3), EC3M 5BN
Up to £95,000 per annum bonus + benefits
Azure, API, PaaS * In-depth knowledge of Azure cloud services (PaaS, Containers, AKS, Logic Apps, API Management, Service Bus, Event Grid).
Azure, API, PaaS * In-depth knowledge of Azure cloud services (PaaS, Containers, AKS, Logic Apps, API Management, Service Bus, Event Grid).
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Senior Backend Engineer
Senior Backend Engineer
Plexus Resource Solutions Ltd
City of London (EC1)
From £60,000 to £100,000 per annum
Use Rest API with Python
Use Rest API with Python
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Azure PaaS, Function Apps, Blob/Table Storage, Service Bus Topics, Azure Search and API Management
Azure PaaS, Function Apps, Blob/Table Storage, Service Bus Topics, Azure Search and API Management
FEATURED
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Senior Frontend Developer
Senior Frontend Developer
Pathfinder Business Solutions Ltd
Milton Keynes (MK9), MK9 3QA
From £50,000 to £60,000 per annum Full Benefits Pack
REST-based API development
REST-based API development
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Senior Data Engineer - SC Cleared - OUTSIDE IR35
Senior Data Engineer - SC Cleared - OUTSIDE IR35
Sanderson Government and Defence
City of London (EC1), EC1
Up to £580 per day
Devops experience a bonus e.g. Terraform, Drone, Kubernetes cluster management for microservice style API data consumption
Devops experience a bonus e.g. Terraform, Drone, Kubernetes cluster management for microservice style API data consumption
FEATURED
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Senior Full Stack Engineer
Senior Full Stack Engineer
McGregor Boyall Associates Limited
City of London (EC1)
£80000 - £120000 per annum + bonus
Strong knowledge of system design principles, scalable architecture patterns, and API design.
Strong knowledge of system design principles, scalable architecture patterns, and API design.
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Application Developer
Application Developer
Wise Employment – Plymouth
Marshgate Trading Estate, Maidenhead (SL6), SL6
Market related
PowerShell scripting, API development
PowerShell scripting, API development
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Our client is developing a platform that streamlines operations and connectivity for firms in the alternative investments space through an API-driven architecture.
Our client is developing a platform that streamlines operations and connectivity for firms in the alternative investments space through an API-driven architecture.
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FTP/SFTP, SSL Certificates, REST API, SOAP, Postman, Excel, CSV files ??
FTP/SFTP, SSL Certificates, REST API, SOAP, Postman, Excel, CSV files ??
FEATURED
Familiarity with REST API and Soap Services
Familiarity with REST API and Soap Services
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Deep knowledge of REST API design, scalability, fault tolerance, and performance optimization.
Deep knowledge of REST API design, scalability, fault tolerance, and performance optimization.
Machine Learning Engineer (Reinforcement Learning)
Machine Learning Engineer (Reinforcement Learning)
FBI &TMT
City of London, London
Up to £85000.00 per annum
Familiarity with model deployment and management, including API development, deployment pipelines, and performance optimisation.
Familiarity with model deployment and management, including API development, deployment pipelines, and performance optimisation.
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AI Prompt Engineer
AI Prompt Engineer
Staffworx Limited
East London (E1)
market rates, outside IR35, remote first, UK but 1-2 days on site
Integrate LLMs into applications usingLangChain,LlamaIndex,Haystack,AutoGen and OpenAIs Assistant API patterns.
Integrate LLMs into applications usingLangChain,LlamaIndex,Haystack,AutoGen and OpenAIs Assistant API patterns.
Lead Software Developer - Python / AWS / React
Lead Software Developer - Python / AWS / React
Tech 4
East London (E1)
From £72,000 to £76,000 per annum + excellent benefits
Experience with AWS services (Lambda, SQS, API gateways, S3).
Experience with AWS services (Lambda, SQS, API gateways, S3).
Experience with AWS services (Lambda, SQS, API gateways, S3).
Experience with AWS services (Lambda, SQS, API gateways, S3).
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Head of Development and AI
Head of Development and AI
McCabe & Barton
City of London (EC1V)
Up to £170,000 per annum Plus Excellent benefits package
Knowledge of microservices architecture, API design (REST, GraphQL)
Knowledge of microservices architecture, API design (REST, GraphQL)
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API Management gateways
API Management gateways
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Data exchange and processing skills (e.g. ETL, ESB, API...)
Data exchange and processing skills (e.g. ETL, ESB, API...)
FEATURED