Senior C# Developer/SDET – £700pd (Inside IR35) – Hybrid (London) – Energy Trading
We are looking for a senior C# Developer/SDET to join a team building a new trading platform.
The team is developing a new end-to-end automated testing capability around the platform. Rather than simply writing tests against individual components, this person will be responsible for helping design and build a testing framework capable of simulating external dependencies and testing the application as a complete system.
A key part of the work will involve building simulators for external systems – for example, simulating an exchange receiving an order and returning fills – allowing realistic trading scenarios to be automatically executed and validated through the CI/CD pipeline.
This is a strongly development-led position rather than a conventional QA automation role.
Responsibilities
- Design and develop an end-to-end automated testing framework in C#.
- Build simulators/mocks for external systems and dependencies, including exchange-style interactions.
- Develop automated integration tests covering complete application workflows.
- Integrate the testing framework into automated build/deployment pipelines.
- Work with event-driven and live-data workflows.
- Build or contribute to backtesting/simulation capabilities.
- Understand the architecture of the trading platform and determine appropriate testing layers and strategies.
- Work closely with developers and trading/business users to reproduce realistic trading scenarios.
Key Requirements
- Strong software engineering fundamentals – this must be a developer-level coder.
- Experience building automated test frameworks rather than simply using existing testing tools.
- Strong integration and end-to-end testing experience.
- Experience building simulators, mocks or test harnesses for external systems.
- Experience with event-driven systems / live events.
- Experience integrating automated testing into CI/CD pipelines.
- Experience with backtesting, simulation or live-data testing would be highly desirable.
- Previous experience within electronic trading, energy trading, financial markets or another real-time/event-driven environment.
- Experience developing or testing trading platforms.
- Experience with BDD approaches/frameworks such as SpecFlow.
- Experience building exchange, market, execution or other external-system simulators.
Trading-domain experience is advantageous but not essential; candidates from other complex event-driven systems can be considered.
Commercials
- Contract position (Inside IR35)
- Initial contract through year-end, with good potential for extension
- Target rate around £700/day.
- Hybrid working – three days per week in the office (London)
- Immediate / ASAP start preferred.
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