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Jeffrey Ren
Mid-Level Full-Stack Software Engineer specializing in React and Ruby on Rails SaaS
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Full-stack engineer who led an end-to-end rebuild of a service-agent case management app (React SPA + backend/DB updates) and added Datadog monitoring, improving agent throughput by ~1 case/hour and saving roughly $15K/month. Experienced in incremental legacy modernization (including moving a legacy React frontend toward a Rails-based approach) with heavy unit/E2E testing and strong cross-team stakeholder communication.
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Key Strengths
- Owned end-to-end production revamp across frontend, backend, database, and monitoring
- Delivered measurable operational impact: +1 case/hour per agent (~$15K/month savings)
- Modernized legacy systems via incremental, low-regression migration strategy
- Strong testing discipline (unit + E2E) to maintain reliability during refactors
- Production observability implementation (Datadog error logging + live dashboards)
- Effective stakeholder alignment on ambiguous goals and tradeoffs (production data vs mock parity)
- Able to context-switch across multiple teams with minimal oversight while maintaining progress
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