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Alex Johnson
Mid-Level Full-Stack Software Engineer specializing in observability and developer tools
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About
Product-leaning full-stack engineer (65% product / 35% infra) who built core components of the LightFoot feature flag platform: end-to-end client/server SDKs with OpenTelemetry-based observability and a React+TypeScript UI for flag management and metrics dashboards. Strong focus on performance (memoization/lazy loading/caching), reliable API design, and Postgres modeling for read-heavy flag evaluation workloads, with AWS production experience (EC2/ECS/Lambda/API Gateway/VPC).
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Key Strengths
- Shipped end-to-end client and server SDKs for a feature flag platform
- Refactored browser telemetry integration using OpenTelemetry and a custom SpanProcessor
- Built customer-facing feature flag management UI and metrics dashboards (React + TypeScript)
- Performance optimization in UI (memoization, lazy loading) and SDK (caching)
- Designs reliable backend APIs with clear auth/versioning/error handling and strong testing/observability practices
- Designed and iterated a normalized PostgreSQL schema for flag evaluation (Flag/Context/Rule) with indexing and caching for read-heavy workloads
- AWS production experience across EC2/ECS/Lambda/VPC/API Gateway with autoscaling and load balancers
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