Senior Software Engineer / Data Platform Engineer
London Area, United Kingdom (Hybrid – 3 days onsite)
Contract Type: 6 month Inside IR35
£700–£750 per day
The Role
You will support the evolution of a large-scale financial data platform, modernising legacy enterprise systems while building scalable cloud-based services on AWS. Own SQL Server optimisation, backend service design, and API development in a high-impact platform modernisation initiative.
What You'll Do
* Develop and optimise SQL Server queries, stored procedures, and data processing logic
* Design and build backend services in Python or C#
* Modernise legacy platforms and improve system performance
* Build and maintain AWS-hosted services and APIs
* Collaborate with distributed engineering and product teams
Top Skills Required
* Advanced SQL Server expertise (performance tuning, indexing, complex queries) – non-negotiable
* Backend development in Python or C#
* AWS environment experience
* Proven experience in enterprise or legacy systems – critical
* Strong analytical and problem-solving abilities
We'd expect you to have around 10 years of software and data engineering skills.
Nice-to-Haves
* Financial services or market data background
* Experience modernising legacy platforms
* API design and ETL/data pipeline experience
* AI-assisted development tools (GitHub Copilot)
* Quantitative or mathematics background
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