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Average Salary
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The Interview Process
Technical Test
Often a take-home test or live coding exercise focused on robustness. E.g., building a small API to consume live Oyster card tap-in data and aggregate it, ensuring it handles malformed data gracefully.
System Design
Focusing heavily on high-availability and disaster recovery. TfL systems (like the contactless payment gateway or the Journey Planner) cannot go down. Expect questions on legacy system integration.
Competency Panel
A formal, structured interview scoring you against TfL behaviours. You must use the STAR method to demonstrate how you manage risk and communicate with non-technical stakeholders.
Real Transport for London (TfL) Interview Questions
Practice these exact questions faced by previous Software Engineer (TfL Tech & Data) candidates.
1The TfL Journey Planner API is experiencing a sudden 500% spike in traffic due to a major incident shutting down the Central Line. Walk me through the exact architectural safeguards you would put in place to ensure the servers don't crash. (Scalability / Resilience)
2TfL relies heavily on incredibly old, legacy mainframe systems for signaling data. You need to build a modern React dashboard that consumes this data. How do you design the middleware to ensure you don't overload the legacy system? (Legacy Integration)
3(Behaviour: Active and Involved) Tell me about a time you identified a potential safety or systemic risk in a codebase that everyone else ignored because it 'wasn't their job'. How did you escalate it?
4During live pairing: This function processes contactless payment transactions at the gateline. It needs to return a decision (open gate or decline) in under 300 milliseconds. Walk me through how you optimize this code for maximum speed. (Performance Optimization)
5How do you balance the desire to use the latest, most innovative open-source frameworks with the strict requirement that TfL software must be stable, auditable, and maintainable for decades? (Technical Pragmatism)
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