Milutin Pešikan

React Native · NestJS · GraphQL · Prisma · PostgreSQL · Stripe

Lead developer and architect. Three codebases behind one GraphQL API: per-date room inventory that cannot oversell, Stripe payments reconciled by webhook, a cached multi-currency rate layer, and the iOS and Android release pipeline through to store approval eleven weeks after the first commit.

NestJS · Next.js · React Native · Socket.IO · Stripe Connect

Lead developer and architect. One API publishing OpenAPI with four clients generated from it, live queue updates over Socket.IO rooms scoped per role, paired thermal ticket printers, and an idempotent webhook ledger over Stripe Connect.

React · Node.js · Express · OpenAI · Tesseract OCR · Firebase

Full-stack developer. OpenAI semantic keyword validation with confidence scoring, AI client extraction from retainer agreements, OCR with word-level bounding boxes for in-place highlighting, multi-role access control and automated billing.

Flutter · NestJS · React · Prisma · PostgreSQL

Lead backend developer. Rebuilt the API and data model under a live app: application-level encryption over special-category data that stays searchable through HMAC-derived tokens, migrated in place, plus the documentation for a third-party vendor security review.

Next.js · NestJS · GraphQL · OpenAI · Vector search

Full-stack developer and AI pipeline architect. Multi-tenant SaaS with GPT natural-language candidate search translated into structured filters, vector embeddings for semantic matching, a conversational CV parser and real-time video interviews.

React · Vite · Apollo GraphQL · NestJS · Prisma

Sole developer. Designed, built and launched end to end for a major client in two months. Past 1,000 monthly users, profile-driven submissions with typed GraphQL operations, led by me through more than two years of release cycles.

React Native · NestJS · Next.js · GraphQL · OpenAI

Architect and full-stack developer. Staged OpenAI agent pipeline with real-time voice coaching, TTS and STT, and guardrails that block unsafe input and scrub personal data, over a mobile app, GraphQL API and dashboard with B2B and B2C tenancy.

NestJS · Prisma · PostgreSQL · Flutter · Next.js

Full-stack developer. Five interconnected apps on one API: a configuration-driven multi-sport scoring engine, real-time sync and push, league hierarchies over 30+ models, and typed clients generated from OpenAPI.