Senior Full Stack Software Developer, Post-Trade

Winton Capital US LLC; Greater London; On-site; GBP 110,000 - 150,000; Full time

Job summary

Winton Capital US LLC in London seeks a Senior Full Stack Developer to craft end-to-end post-trade and reporting software, combining strong backend C#/.NET with modern frontend work, and collaborating directly with business stakeholders.

You will design services, APIs and data integrations, build UIs, and own projects from requirements through deployment, while leveraging AI coding tools to boost productivity in a fast-paced financial environment.

Qualifications

• 5+ years of professional software development experience, ideally in financial services or data-intensive systems.
• Strong backend capability in C#/.NET and ability to design services, APIs and data integrations.
• Competent with a modern frontend framework and able to build user-friendly UIs for non-technical users.
• Comfortable using AI coding tools as part of daily work.
• Interest in financial markets and ability to collaborate with business stakeholders.

Responsibilities

• Own and evolve core post-trade systems including confirmations, trade support, treasury, and fund accounting.
• Design and implement backend services, APIs and data integrations.
• Build and maintain internal UIs with emphasis on performance and usability.
• Engage in requirements gathering, design, implementation, testing, release and support.
• Collaborate with business teams to translate requirements into technical solutions.
• Support production systems and investigate issues with timely fixes.
• Participate in code reviews and knowledge sharing.

Skills

C#/.NET backend

Frontend framework (Angular/React)

AI coding tools (Claude Code)

Finance domain interest

5+ years experience

Tools

Angular

TypeScript

MSSQL

PostgreSQL

AWS

Docker

Kubernetes

Job description

We are seeking a Senior Full Stack Developer with strong experience in both modern web technologies and backend technologies, a talent for business processes, and a keen interest in finance. The ideal candidate is enthusiastic, collaborative and delivery-focused, with a strong sense of ownership and ability to pick things up quickly in a fast-paced environment. They will bring both a user-centred mindset and the technical depth required to deliver robust end-to-end solutions.

You will be part of a friendly and collaborative team responsible for post-trade and reporting software development. The role involves working closely with operations, fund accounting, and other teams across the business including senior management - there is no BA layer, you will gather requirements directly from the business, design solutions and own them end-to-end. In addition to project work, you will have regular opportunities to implement enhancements for both business and technology.

Your Responsibilities Will Include

• Own and evolve core post-trade systems covering confirmations, trade support, treasury, corporate actions, reconciliations, limit monitoring and fund accounting
• Design and implement backend services, APIs and data integrations
• Build and maintain internal UIs where performance, data quality and usability all matter
• Work across the full application lifecycle: requirements gathering, design, implementation, testing, release and support
• Engage directly with business teams to understand requirements and translate them into thoughtful technical solutions
• Support production systems, investigate issues and implement fixes where required
• Collaborate through code reviews, design discussions, and knowledge sharing

What We Are Looking For

• 5+ years of professional software development experience, ideally in financial services or data-intensive systems
• Strong backend capability in C#/.NET - you are comfortable designing services, APIs, and data integrations, not just consuming them
• Competent with a modern frontend framework - you can build UIs that non-technical users actually want to use
• Comfortable using agentic AI coding tools such as Claude Code and are genuinely keen to use them as a natural part of daily work
• Interest in financial markets across all asset types
• Enthusiastic, collaborative and comfortable working closely with business stakeholders
• Strong communication skills with both technical and non-technical colleagues and a positive, can-do attitude

What Would Be Useful

• Deep knowledge of any of: the trade life-cycle, valuation and P&L, fund accounting, margin calculation
• Familiarity with Angular (preferred), React or another structured modern front-end framework

Technologies We Use

• Web: Angular, TypeScript
• Server-side: C#
• Data: MSSQL, PostgreSQL
• Cloud: AWS
• Deployment: Docker, Kubernetes