John Kenny

About

Full-stack engineer with deep startup experience (pre-seed through IPO/SPAC) currently building a Next.js/TypeScript SaaS sports analytics platform with a complex Postgres-based entitlement/ACL system. Has delivered measurable UX/business impact (35% retention lift, 40% volume increase) and built production-grade daily ETL + model training/inference workflows with validation and checkpointing for reliability.

Experience

Key Strengths

• Shipped and owned an end-to-end Next.js/TypeScript SaaS feature through production deployment
• Improved UX funnel outcomes: +35% retention and +40% transaction volume by reducing clicks from 5 to 2
• Designed complex Postgres entitlement/ACL schema for multi-tenant access control
• Optimized entitlement/plan-gating query logic to improve performance (~15%)
• Built durable, stage-based ETL + daily training/inference workflow with validation gates and checkpoints
• Strong production engineering practices: observability, safe change boundaries, deterministic backend behavior
• Owned customer-facing products end-to-end (minting website and gaming leaderboard at Consortium 9)
• Designs modular MVPs to balance speed with future extensibility
• Deep security/compliance-aware architecture for crypto wallets using ZK proofs to avoid server-side key custody
• Microservices experience with AWS Lambda + RabbitMQ; identified over-engineering and improved maintainability via service self-containment
• Optimized systems for bursty usage patterns using caching
• Shipped React/Next.js production product end-to-end under tight deadline (architected stack, implemented from scratch)
• High-scale production impact (reported ~3M lifetime volume) with minimal defects (one production bug tied to last-minute 3rd-party integration)
• Payment-flow/concurrency rigor (implemented locking pattern to protect transaction integrity)
• Data-driven UX iteration (used analytics to identify navigation friction; redesigned IA/UI to improve flow)
• Full-stack delivery across web, mobile, and backend (roughly 50/50 app vs infrastructure)
• Designed Python microservice backend with OAuth auth, URL versioning, tests, and CloudWatch observability
• Designed relational sports/betting analytics schema and improved performance via indexing