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winston lo

Junior Software Engineer specializing in AI agents, RAG, and full-stack development

Tresle AIUC BerkeleyRemote2 Years ExperienceJunior LevelWorks On-Site

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About

Backend engineer who built and iterated a secure, multi-tenant RAG system over a large document corpus, emphasizing strict RBAC/ACL isolation, hybrid retrieval (vector+keyword), reranking, and strong observability to balance relevance, latency, and cost. Also led production refactors/migrations using strangler + feature flags/dual writes and has experience catching subtle real-world failure modes (including in a sensor calibration optimization pipeline).

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Key Strengths

  • Designed secure RAG backend with early ACL filtering and hybrid retrieval (vector + keyword) plus reranking
  • Strong multi-tenant data isolation via retrieval-time filtering and centralized policy evaluation
  • Balances relevance, latency, and LLM/infra cost using candidate set limiting, chunking strategy, and caching
  • Security-first mindset with access-control audits, detailed retrieval decision logging, and cross-tenant test coverage
  • API platform engineering in FastAPI: versioned contracts, backward compatibility, deprecation strategy, and contract tests
  • Led low-risk migrations using strangler pattern, feature flags, dual writes, parallel output validation, and canary rollouts
  • Deep observability practice (metrics, tracing, structured logs) to diagnose slow dependencies and regressions
  • Proactively finds hidden failure modes (e.g., false local minima in calibration optimization) and adds scenario-based validation

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Experience

Software EngineerTresle AI · Jan 2026 – Present
Software Engineer (Contract)Lucid Motors · Sep 2025 – Presentcontract
Software Engineer InternSan Francisco Police Department (SFPD) · May 2025 – Aug 2025internship
Software EngineerFlowNow · Jan 2025 – Jun 2025
Software Engineer (Contract)Bentley Systems · Jun 2024 – Dec 2024contract

Education

UC Berkeleybachelor, Computer Science and Data Science (2026)

Languages

English

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winston loJunior Software Engineer specializing in AI agents, RAG, and full-stack development