26 to 50 of 167 Permanent API Development Jobs

Tech: C#, Multithreading, Grindgain, Linq, SQL, Winforms Challenge: Greenfield Trading platform, API development, industry specific challenges Firm: Well-known Fintech Trading Platform Vendor, City of London, 30 man flat global Dev Team Pay: 80k, Bonus- 750 training budget, Pension, Life/Health, Some Flex WorkingC# Software Engineer – MultithreadingQuant … business. They provide valuations and pricing of derivatives to most of the buy side.This is an opportunity for an individual with a strong software development background. The applicant will be responsible for design, development and maintenance of my clients main pricing analytical library in C#. Quants Developers Must ...

Junior Frontend Developer Angular Developer – FintechTech: Angular, C# .net, Azure, SQL, Team City, GIT, TFSChallenge: Greenfield Trading platform, API development, industry specific challengesFirm: Well-known Insurtech software business, London, 10 man flat Dev TeamUp to 45,000Quant is urgently looking for an Angular Developer to join our high … profile client.Current challenges include cloud migration, greenfield trading platform development, and bank based API creation.Our client is a well known fintech software house in central London.This is an expansionary role building a greenfield financial modelling platform used by major finance business’.Working together with our team leads, solution ...

/CD pipelines, cloud infrastructure, and deployment automation across a hybrid cloud and on-premise ecosystem.This role combines DevOps engineering, cloud architecture, and software development, requiring strong experience in automation, scripting, and full-stack engineering support. The position supports critical delivery pipelines and helps scale engineering capabilities by consolidating … responsibility for CI/CD and DevOps operations, while also contributing to application development when needed.Key ResponsibilitiesDesign, build, and maintain CI/CD pipelines using GitLab CI/CD, Jenkins, and GitHub EnterpriseDevelop and manage Infrastructure as Code (IaC) using AWS-native tools and automation frameworksBuild and optimize cloud ...

Implement Infrastructure as Code using Terraform. Establish and maintain CI/CD pipelines and GitHub Actions workflows. Embed security controls and governance into the development lifecycle. Help define engineering standards, reusable patterns and best practices. Coach internal teams and contribute to the organisation's growing AI capability. Essential Skills … Experience We're looking for candidates with strong experience in: Cloud & Platform Microsoft Azure Kubernetes Terraform GitHub Actions Development Python API Development REST APIs GraphQL AI & Automation Large Language Models (LLMs) GPT, Claude and/or Gemini AI Agents Retrieval-Augmented Generation (RAG) Vector Databases LLM orchestration ...

large-scale data and asset modelling using Python, with particular expertise in Pydantic-based data modelling, schema definition and validation. Experience with AI-assisted development and agent orchestration tools is highly desirable, particularly where these technologies are used to accelerate high-quality software delivery. In this role, you will … models. Develop high-quality Python solutions for data modelling and governance use cases, using Pydantic for schema definition, validation, serialization, configuration-driven models and API-ready data structures. Build reusable Python libraries, modelling components and automation patterns supporting data ingestion, governance workflows, data quality, lineage, integrations and reporting ...

including Finance, Risk, and Controllers.This strategic journey requires a highly motivated and accomplished Senior Vice President, Full Stack Engineering Lead to drive the design, development, and delivery of a next-generation platform. The solution will be built from the ground up, leveraging cutting-edge technologies including Java, Spring Boot … React.What you’ll doSoftware Development: Design, develop, test, and deploy high-quality, scalable, and maintainable code.Quality Advocacy: Promote best practices for engineering excellence in coding, testing, build, deployment, and the maintenance of high-quality software.Solution Implementation: Act as an active contributor to design and a hands-on implementer ...

Tech: ASP.NET MVC 5, Restful API, Angular, SQL, Azure Challenge: Greenfield Trading platform, API development, industry specific challenges Firm: Well-known fintech50 business, 40 man flat Dev Team Pay: 120k, Bonus- 750 training budget, Pension, Life/Health, Some Flex Working Technical Architect FintechQuant is urgently looking … hands on Technical Architect to join our high profile client. Current challenges include cloud migration, greenfield trading platform development, and bank based API creation. Our client is well known in the WRAP and SIPP market as a full service provider.The environment is that of Facebook or Google, relaxed ...

Liverpool | Hybrid Working | Competitive Salary We're looking for an experienced Lead Solutions Architect & Development Lead to join our senior IT team, reporting directly to the IT Director. This is a hands-on technical leadership role where you'll shape the firm's technology strategy while remaining actively involved … software development, architecture, database management and team leadership. You'll play a key role in designing scalable enterprise solutions for a 1,000-user organisation and work closely with senior stakeholders to deliver technology that drives the business forward. Key Responsibilities Lead the design of enterprise-wide software architecture ...

Tech: C# 5, Visual Studiuo, AWS, Angular.JS, Bootstrap, Docker Challenge: Greenfield Financial platform, API development, industry specific challenges Firm: Well-known fintech50 business, City of London, 30 man flat Dev Team Pay: 70k, Bonus- training budget, Pension, Life/Health, Some Flex WorkingC# Senior Developer FintechQuant Capital … looking for a C# developer who wants to work in a tech driven bleeding edge business creating truly greenfield products. Working within the Development team the C# Developer will helping to introduce a new architecture as well as creating new products. This role also involves a clear career progression ...

Architect to take a leading role in designing robust, scalable, and innovative technology solutions for our clients. You will work closely with stakeholders and development teams to ensure the alignment of technology with business goals, while championing best practices in architectural design and delivery. Key Responsibilities: Collaborate with development … lead and influence technical discussions Proven experience as a Technical Architect or similar role In-depth knowledge of system design, software architecture, and development methodologies Experience with cloud platforms (e.g., AWS, Azure, Google Cloud) Expertise in architectural design, data pipelines, cloud platforms, and API development Knowledge ...

high profile client.My client is a growing global Fintech business and market leaders in the invoice finance space. They are currently expanding their development team with an additional 3 developers in the City of London.The ASP.NET MVC Development role is expansionary due to a brand new international platform … being created. The ASP.NET MVC Developer will be involved in greenfield platform development for a global high demand high transaction payments gateway. The frontend development of their web platform in HTML5, Javascript, angular.js and CSS3 and the backend in ASP.NET MVC and noSQL (which will be gained ...

high profile client.My client is a growing global Fintech business and market leaders in the invoice finance space. They are currently expanding their development team with an additional 3 developers in the City of London. The ASP.NET MVC Development role is expansionary due to a brand new international … platform being created. The ASP.NET MVC Developer will be involved in greenfield platform development for a global high demand high transaction payments gateway. The frontend development of their web platform in HTML5, Javascript, angular.js and CSS3 and the backend in ASP.NET MVC and noSQL (which will be gained ...

Tech: ASP.NET MVC 5, Restful API, Angular, SQL, Azure Challenge: Greenfield Trading platform, API development, industry specific challenges Firm: Well-known fintech50 business, City of London, 10 man flat Dev Team Pay: 40k, Bonus- 750 training budget, Pension, Life/Health, Some Flex WorkingJunior ASP.NET MVC Developer … FintechQuant is urgently looking for an ASP.NET MVC Developer to join our high profile client. Current challenges include cloud migration, greenfield trading platform development, and bank based API creation. Our client is well known in the WRAP and SIPP market as a full service provider.The environment is that ...

contribute to the design, implementation, and maintenance of new features and platform enhancements. You will work as part of a collaborative team, following best development practices to deliver high-quality software that meets business needs.Key ResponsibilitiesParticipate in the design, development, and testing of platform features adhering to Edenred … with peers and senior engineers to deliver software that meets quality and performance benchmarks.Support knowledge sharing through documentation and teamwork to ensure maintainability.Follow agreed development processes and contribute to continuous improvement of our platform and practices.Work collaboratively to deliver projects on time and to specification.Core Technical SkillsExperience with Java ...

ASP.NET Developer – FintechTech: C# .net, Azure, SQL, Team City, GIT, TFS Challenge: Greenfield Trading platform, API development, industry specific challenges Firm: Well-known Insurtech software business, West London, 10 man flat Dev Team Pay: 65k Some Flex WorkingQuant is urgently looking for an ASP.NET MVC Developer to join … high profile client.Current challenges include cloud migration, greenfield trading platform development, and bank-based API creation. Our client is a well-known fintech software house in central London.This is an expansionary role building a greenfield financial modelling platform used by major finance business’.Working together with our team ...

Your new company We are looking for a proactive and enthusiastic Software Developer to join a growing development team. This is an exciting opportunity to work across a diverse technology landscape, supporting and enhancing business-critical applications while helping to deliver innovative, cloud-based solutions.You'll play … external clients. Working with modern Microsoft technologies, you'll contribute to projects spanning Azure cloud platforms, on-premise systems, APIs, integrations and AI-assisted development tools.This role offers the chance to collaborate with Product Managers, DevOps Engineers, QA Specialists and Business Stakeholders in an environment focused on continuous improvement ...

Tech: ASP.NET MVC 5, JavaScript, Angular 2, Entity Framework, WEB API, JQuery, MySQL, MicroservicesChallenge: Greenfield Trading platform, API development, Azure development.Firm: Well known FX fintech50 business, City of London, 10 Man flat Dev TeamPay: 110k, Bonus, Pension, Life/Health, Some Flex Working, HybridFull Stack Developer FintechQuant … urgently looking for a Full Stack Developer to join our high profile client.Current challenges include cloud migration, greenfield trading platform development, and bank based API creation.Our client is a well known broker in the equities space. They are currently building a greenfield trading platform based in equities.The environment ...

Tech: ASP.NET MVC 5, JavaScript, Angular 2, Entity Framework, WEB API, JQuery, MySQL Challenge: Greenfield Trading platform, API development, Azure development. Firm: Well known FX fintech50 business, City of London, 10 Man flat Dev Team Pay: 65k, Bonus, Pension, Life/Health, Some Flex WorkingASP.NET MVC Developer … FintechQuant is urgently looking for an ASP.NET MVC Developer to join our high profile client.Current challenges include cloud migration, greenfield trading platform development, and bank based API creation.Our client is a well known broker in the equities space. They are currently building a greenfield trading platform based ...

will be working for one of our high-profile trading clients within the financial services domain, contributing hands-on to a Java-based development team supporting a high-volume message processing environment.The team is heavily Java-focused, operating within a client ecosystem that relies extensively on Kafka, Kubernetes/… OpenShift, caching solutions, REST APIs, and high-throughput distributed systems. You will bring solid, practical experience in backend Java development and a keen interest in scalable distributed systems.ResponsibilitiesTechnical DeliveryDesign, develop, and maintain backend components in Java, with a focus on performance and resilience.Contribute hands-on to features across messaging ...

will be working for one of our high-profile trading clients within the financial services domain, contributing hands-on to a Java-based development team supporting a high-volume message processing environment.The team is heavily Java-focused, operating within a client ecosystem that relies extensively on Kafka, Kubernetes/… OpenShift, caching solutions, REST APIs, and high-throughput distributed systems. You will bring solid, practical experience in backend Java development and a keen interest in scalable distributed systems.ResponsibilitiesTechnical DeliveryDesign, develop, and maintain backend components in Java, with a focus on performance and resilience.Contribute hands-on to features across messaging ...

will be working for one of our high-profile trading clients within the financial services domain, contributing hands-on to a Java-based development team supporting a high-volume message processing environment.The team is heavily Java-focused, operating within a client ecosystem that relies extensively on Kafka, Kubernetes/… OpenShift, caching solutions, REST APIs, and high-throughput distributed systems. You will bring solid, practical experience in backend Java development and a keen interest in scalable distributed systems.ResponsibilitiesTechnical DeliveryDesign, develop, and maintain backend components in Java, with a focus on performance and resilience.Contribute hands-on to features across messaging ...

will be working for one of our high-profile trading clients within the financial services domain, contributing hands-on to a Java-based development team supporting a high-volume message processing environment.The team is heavily Java-focused, operating within a client ecosystem that relies extensively on Kafka, Kubernetes/… OpenShift, caching solutions, REST APIs, and high-throughput distributed systems. You will bring solid, practical experience in backend Java development and a keen interest in scalable distributed systems.ResponsibilitiesTechnical DeliveryDesign, develop, and maintain backend components in Java, with a focus on performance and resilience.Contribute hands-on to features across messaging ...

will be working for one of our high-profile trading clients within the financial services domain, contributing hands-on to a Java-based development team supporting a high-volume message processing environment.The team is heavily Java-focused, operating within a client ecosystem that relies extensively on Kafka, Kubernetes/… OpenShift, caching solutions, REST APIs, and high-throughput distributed systems. You will bring solid, practical experience in backend Java development and a keen interest in scalable distributed systems.ResponsibilitiesTechnical DeliveryDesign, develop, and maintain backend components in Java, with a focus on performance and resilience.Contribute hands-on to features across messaging ...

will be working for one of our high-profile trading clients within the financial services domain, contributing hands-on to a Java-based development team supporting a high-volume message processing environment.The team is heavily Java-focused, operating within a client ecosystem that relies extensively on Kafka, Kubernetes/… OpenShift, caching solutions, REST APIs, and high-throughput distributed systems. You will bring solid, practical experience in backend Java development and a keen interest in scalable distributed systems.ResponsibilitiesTechnical DeliveryDesign, develop, and maintain backend components in Java, with a focus on performance and resilience.Contribute hands-on to features across messaging ...

98742248336Posted: 2026-08-04Location: London, England, United KingdomCategory: Technology, Applications Development, ProfessionalCompany: CitiFX Client Platforms - Senior UI Software Engineer (Vice President)About the RoleWe are seeking a Senior Applications Developer to join a team delivering pricing solutions for the Foreign Exchange (FX) business. You will cover the full … software development lifecycle — analysis, design, implementation, and testing — while providing technical leadership to the team.Primary ResponsibilitiesDesign and develop high-quality trading GUIs providing compelling user experiences for internal and external tradersDefine and enforce interoperability standards across web applications using FDC3, and REST/WebSocket APIs. Experience with OpenFin ...