Northwind AI · Remote (US)
Senior Software Engineer, AI Platform
Ready to apply
Evidence that I can own platform services end-to-end and verify AI-generated change safely, the two signals this role emphasizes most.
Systems I understand
- ✓Payments service (60k LOC): end-to-end data flow and idempotency
- ✓Auth subsystem: token scoping and refresh flow
Architecture I can explain
- ✓Multi-tenant data model with tenant-isolation trade-offs (STT-verified)
- ✓Money-movement invariants across 4 payment modules
Repo Mastery evidence
- ✓Repo Mastery map of payments service (verified)
AI change-review evidence
- ✓OpenThunder verification of an AI auth refactor: caught a scope regression (verified)
Communication readiness (STT + Rooms)
- ✓STT architecture-explanation drill: scored 'strong'
- ✓Rooms senior mock interview: senior signal present
Gaps to address before applying
- △Add one serving/scaling system-design proof (SkillsTech mission recommended)
Interview prep actions
- ◈Complete STT distributed system-design explanation drill
- ◈Book a staff-level mock in Rooms to stretch the seniority signal
Attached proof artifacts
4 verified pieces of evidence
Auth refactor: AI change verification
OpenThunder✓ Verified
Reviewed and verified a large AI-generated auth refactor, catching a token-scope regression before merge.
- ›Identified an AI-introduced scope-widening bug across 12 files
- ›Wrote the differential test that pinned the correct scope behavior
- ›Produced an OpenThunder change-verification report signed off by 2 reviewers
AI Change VerificationCodebase Ownership
Payments service: codebase mastery
Repo Mastery✓ Verified
Demonstrated end-to-end ownership of a 60k-LOC payments service: data flow, failure modes, and idempotency guarantees.
- ›Traced a charge from API edge → ledger write → webhook reconciliation
- ›Explained idempotency-key design and retry safety under partial failure
- ›Mapped the money-movement invariants enforced across 4 modules
Codebase OwnershipArchitecture Explanation
Architecture explanation: STT readiness
Skills Tech Talk✓ Verified
Passed a Skills Tech Talk architecture-explanation drill: explained a multi-tenant data model to a mixed technical/exec audience.
- ›Explained tenant isolation trade-offs at 3 levels of depth on demand
- ›Handled a curveball on noisy-neighbor mitigation without notes
- ›Scored 'strong' on clarity, structure, and executive framing
Architecture ExplanationInterview Communication
Senior mock interview: Rooms
Rooms✓ Verified
Completed a recorded senior-level mock interview in Rooms with structured feedback.
- ›Drove a system-design round for a rate limiter end-to-end
- ›Communicated trade-offs and asked scoping questions proactively
- ›Feedback: 'senior signal present; tighten estimation math'
Interview CommunicationSystem Design ReadinessSeniority Signal
Timeline
Saved job
2026-06-29
Ran job analysis
2026-06-30
Assembled proof packet: 1 gap to close
2026-07-02