What to Expect When Hiring a Senior Quant Engineer

Days 1-30: Onboarding & Understanding

What should happen:

• ✦ Set up development environment (C++/Rust toolchain, exchange APIs, market data feeds)
• ✦ Understand trading system architecture and risk controls
• ✦ Review existing codebase and identify technical debt
• ✦ Shadow on-call rotations and incident response
• ✦ First minor bug fix or documentation improvement

What Defines A Senior Quant Engineer

• ✦ Production trading system ownership
• ✦ Architecture and design leadership
• ✦ Performance optimization experience
• ✦ Incident response and operational maturity
• ✦ Mentorship and technical leadership
• ✦ Ability to balance risk, reliability, and speed

Days 31-60: Contributing & Optimizing

What should happen:

• ✦ Implement non-critical feature or exchange connectivity
• ✦ Profile and optimize a latency-critical path (10-30% improvement)
• ✦ Participate in design reviews
• ✦ Begin mentoring junior engineers
• ✦ Deliver: measurable latency improvement or new feature

Days 61-90: Leading & Designing

What should happen:

• ✦ Lead design of new system component
• ✦ Handle production incidents independently
• ✦ Propose architectural improvements
• ✦ Onboard new quant engineers
• ✦ Deliver: design document approved and ready for implementation

Warning Signs

Red flags:

• ✦ Day 30: Not comfortable with codebase or domain
• ✦ Day 60: No measurable contributions
• ✦ Day 90: Not leading any initiatives
• ✦ Avoids on-call or incident response
• ✦ Can't explain system architecture

Positive Success Indicators

• ✦ Builds trust with traders and stakeholders
• ✦ Improves system reliability
• ✦ Documents architectural decisions
• ✦ Reduces operational risk
• ✦ Mentors less experienced engineers
• ✦ Identifies optimization opportunities proactively

Set Clear Expectations