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dean4000

Constantine D

@dean4000

Senior Full Stack Engineer

Verenigde Staten
Engels
Sommige informatie wordt in het Engels weergegeven.
Over mij
Senior Systems & Full-Stack Engineer. I build heavy, production-grade systems where scale, concurrency, and architecture matter. Recent production ships: • iPostal1: Idempotent payment state machines, multi-tenant layer for 4,250+ locations, eval-gated Claude AI tool-calling (cut support 10h to 2h). • Bank of America: Spring Boot/Kafka pipelines handling 40M+ events/day; zero-downtime PostgreSQL migrations (<50ms p95). • Open Source: Created 'quietfail' process supervisors & 'tt-capture' market data engines catching look-ahead bias in 2M WebSocket ticks.... Lees meer

Skills

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dean4000
Constantine D
offline • 

Bekijk mijn diensten

Full stack webapplicaties
I will architect and build you production grade, full stack systems
VanafUS$ 175 / projectMeer informatie

Werkervaring

Freelance

Principal Full-Stack Architect & AI Consultant

Freelance • Freelance

Jul 2026 - Present • 4 mos

Partnering with founders and enterprise teams to architect and ship end-to-end SaaS platforms, multi-tenant payment systems, and production LLM applications. Designing evaluation-driven AI workflows (Anthropic Claude, OpenAI), scalable Next.js/TypeScript applications, and resilient cloud infrastructure with zero-downtime deployment pipelines.

iPostal1

Senior Full Stack Engineer (iPostal1)

iPostal1 • Fulltime

Aug 2025 - Jul 2026 • 11 mos

Rebuilt payment/shipping checkout with idempotency keys & explicit state machines across Symfony, PostgreSQL & Nuxt 3 SSR, eliminating race conditions. Architected multi-tenant delivery layer for 4,250+ partner locations (versioned schemas, S3 assets), cutting brand onboarding from weeks to days. Shipped eval-gated Claude API tool-calling & RAG features, reducing ticket handling from 10h to 2h.

Bank_of America

Senior Full-Stack & Distributed Systems Engineer

Bank of America • Fulltime

Apr 2023 - Jul 2025 • 2 yrs 3 mos

Architected and scaled event-driven Spring Boot and Kafka microservices processing 40M+ events/day with sub-50ms p95 latency. Led the development of an enterprise TypeScript/React component system adopted by 20+ engineering teams, saving 200+ engineering hours per sprint. Engineered zero-downtime PostgreSQL and MongoDB schema migrations for mission-critical banking data.