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John Kenny - Senior FullStack Engineer in Global, Remote

John Kenny

Senior Full-Stack Engineer specializing in Web3 and FinTech

FreelanceGlobal, Remote6 Years ExperienceSenior LevelWorks On-Site

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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.

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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

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Experience

Senior FullStack EngineerFreelance · Jun 2021 – Presentfreelance
Business Consultant/Senior Software EngineerMattereum · Oct 2023 – Jun 2024freelance
Senior Software EngineerConsortium 9 · Feb 2022 – Sep 2023
Senior FullStack EngineerSoundverse · Sep 2021 – Jan 2022
Head of TechnologyDLTX · Mar 2021 – Sep 2021
FullStack EngineerBAM Marketing · Aug 2019 – Jan 2021
Business ConsultantMATTEREUM · Oct 2023 – Jun 2024freelance
Software Engineer/ Quantitative TraderFreelance · Jun 2021 – Presentfreelance

Languages

EnglishGermanSpanish

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Connect with John

John already has a relationship with Reval, so a warm intro from us gets a much better response than cold outreach.

Typically responds within 24 hours

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Already have an account?

Hire with Reval

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John KennySenior Full-Stack Engineer specializing in Web3 and FinTech