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Senior Software Engineer | Full Stack | Investment Tech | London, Hybrid

Senior Software Engineer | Full Stack | Investment Tech | London, Hybrid

Hybrid

London, United kingdom

Senior

Full Time

04-02-2026

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Skills

Python C# CSS SQL NoSQL GitHub CI/CD DevOps Docker Kubernetes Monitoring Azure DevOps Decision-making Azure react Analytics Material UI Snowflake FastAPI Microservices GitHub Actions

Job Specifications

Senior Software Engineer | Full Stack | Investment Tech | London, Hybrid

We’re hiring a Senior Software Engineer to join a London-based Investment Technology team building the platforms used for risk, analytics, and investment decision-making. This is a genuinely hands-on role: you’ll ship production features, improve reliability, and help shape modern engineering standards across a business-critical platform.

If you enjoy solving real problems with clean, testable code (and you don’t need ten meetings to write a function), you’ll fit right in.

London City | Hybrid (3 days in office)

Competitive base + bonus + benefits

⏱ Permanent Role

No sponsorship available

What you’ll be doing

Build and evolve backend services in C#/.NET (performance, correctness, maintainability)
Develop data-driven APIs and pipelines (Python services, e.g., FastAPI, and integrations)
Deliver modern React UI components that are fast, usable, and predictable
Troubleshoot issues end-to-end across app + data layers (you’ll own problems, not just spot them)
Implement and improve CI/CD using Azure DevOps and/or GitHub Actions
Partner with business stakeholders to clarify requirements and iterate quickly
Keep documentation lightweight but useful (the goal is clarity, not a novel)

What we’re looking for (must-haves):

Strong commercial experience with C#/.NET
Production experience with React (you’ve built real UIs, not just tweaked CSS)
Hands-on Python (FastAPI or similar is a plus)
Solid SQL skills (querying, performance awareness, data modelling basics)
Strong testing mindset: unit tests in C# and ideally Python too
Clear communicator who can work with technical and non-technical stakeholders
Exposure to investment management / fixed income domains

Nice to have:

Azure experience (Functions, App Services, storage, monitoring)
Containers: Docker (and Kubernetes is a bonus)
Microservices patterns and practical trade-offs
CosmosDB / NoSQL, Snowflake, or similar data platforms
Front-end testing (e.g., Playwright/Jest) and UI libraries (e.g., Material UI)

Why this role?

Modern stack (C# + React + Python + cloud) with genuine delivery ownership
Work directly on systems that influence investment decisions, not internal admin tooling
A team that values engineering quality (testing, code reviews, automation)

Interested? Apply directly with your CV to this advert or email it to chantelle.smith@sourcegroupinternational.com

About the Company

Source Group International - Award-Winning Staffing Solutions Provider. We create value for our customers and community. Our recruitment solutions operate from offices globally, including London, Amsterdam, Zug, and Austin. Our vision is to make a lasting, positive impact on people's lives. We deliver talent into technology markets and add value to our customers through our Technology Recruitment brand - Source Technology and our Community Platform - Source Talks. We believe in making a positive difference to people... Know more