Full Stack C# .NET Developer | Post‑Trade Operations | ETD | Up to £140,000 | AWS | Financial Services | Hybrid, London
A Full Stack C# .NET Developer is required to join a high‑performing operations technology team within one of London’s most technology‑driven financial services firms, operating across global commodity and derivatives markets.
This is a full‑stack role with a strong C# .NET backend focus, working on operationally critical systems that support the post‑trade processing of Exchange‑Traded Derivatives (ETD). You will be working across the full stack from React front‑ends through to C# .NET services and data layers in a highly data‑driven environment where accuracy, traceability and consistency are paramount.
This is a rare opportunity for a strong technologist to move into financial services at a firm that genuinely treats technology as a core part of its business rather than a support function. Domain knowledge is not a prerequisite; what matters most is full‑stack engineering depth, a methodical approach to data and a desire to work on complex, high‑integrity systems.
Team
The ETD Operations Technology team sits at the heart of the firm’s post‑trade ecosystem. They design and maintain the systems responsible for:
- Building and maintaining full‑stack C# .NET and React applications supporting post‑trade operational workflows
- Processing and validating high‑integrity transactional and position data across C# .NET services
- Supporting deliveries processing, segregation movements and settlement workflows
- Handling commission and fee calculations and operational adjustments
- Ensuring exchange‑traded activity is accurately reflected across internal platforms and client accounts
The environment is data‑intensive and operationally critical, built on modern C# .NET, React and AWS infrastructure. The team works closely with operations stakeholders, business analysts and QA to deliver reliable, production‑grade solutions that meet strict regulatory and compliance standards.
Role
Location: Hybrid working, LondonSalary: Up to £140,000 + BenefitsTech Stack: C# • .NET • React • TypeScript • AWS • Docker • Terraform • SQL • NoSQL • CI/CD
Responsibilities
- Design, build and test full‑stack C# .NET and React applications within a post‑trade processing environment
- Develop modern, responsive React front‑ends that surface complex operational and position data to business users
- Develop and maintain high‑integrity C# .NET backend services handling positions, balances, cash movements and fee calculations
- Work with large volumes of structured transactional and position data, ensuring accuracy and consistency across downstream systems
- Contribute to architecture and design decisions across the full stack
- Write clean, maintainable and testable code across C# .NET and React, adhering to BDD/TDD practices
- Ensure solutions meet regulatory and compliance requirements across applicable exchanges and clearing frameworks including FCA, SEC, CFTC and NFA
- Support and improve CI/CD pipelines and DevOps practices across the full stack
- Liaise with operations stakeholders and business analysts to translate requirements into robust full‑stack solutions
- Work closely with compliance and risk teams to ensure data integrity, traceability and auditability across all systems
Required Qualifications
- Strong commercial experience as a Full Stack C# .NET Developer
- Hands‑on experience building React front‑ends, ideally with TypeScript
- Experience working with high‑volume transactional or position data in an operationally critical environment
- Experience with Docker and containerisation
- Experience with NoSQL or relational databases, with an understanding of data integrity and consistency patterns
- Infrastructure‑as‑Code experience, ideally with Terraform
- Solid understanding of modern CI/CD and DevOps practices
- Experience with AWS or equivalent cloud technology
- Knowledge of BDD/TDD methodologies
- Experience working in Agile/Scrum delivery environments
- Experience working in a regulated financial services environment with exposure to FCA, SEC, CFTC or NFA compliance requirements
- Knowledge of Exchange‑Traded Derivatives (ETD) operations or post‑trade systems
- Familiarity with deliveries processing, settlement workflows, reconciliation processes or client money segregation
- Experience building or maintaining data pipelines handling margin outputs, cash movements or fee calculations
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