Sergey Muratov

Systems Architect · Fullstack Engineer · Team Lead

Profile

15+ years shipping products end to end — mobile, web, and the systems underneath. I design architectures that survive production: typed contracts, boring infrastructure, decisions written down before the code. AI as leverage, not decoration.

Experience

15+ years

Specialty

Systems architecture

Focus

AI-driven products

Location

Serbia, Remote‑first

Skills

AI Systems

LLM integrationAI agentsMCPRAG & vector searchDocument extractionPyTorchPrompt engineering

Backend & Data

TypeScriptNode.jsFastifyPythonFastAPIGoPostgreSQLRedisPrismaZod

Frontend & Mobile

Vue 3NuxtFlutterDartReactSCSSDesign systemsSSR/SSG

Platform & Delivery

Docker ComposeCI/CDGitHub ActionsNginx / CaddyS3Vitest

Professional Experience

Founder & Systems Architect

2026 — Present · Independent

Products: JUlCY.art · frka.dev

TypeScriptFastifyPostgreSQLZodPythonVue 3DockerLLMs
  • JUlCY — an AI image studio for creators who can't hand their work to someone else's cloud. Prompts and output never leave the perimeter.
  • Made that promise structural rather than a policy page: generation runs on workers that hold no credentials, every image is signed and auditable, and nothing is sent to a third party — no telemetry, no external moderation.
  • frka.dev — turns client scope drift into billable change orders. The spec is kept canonical, contradictions get caught as they arrive, and every change carries a provenance trail the client can't argue with.
  • Both designed solo, end to end — product, architecture and delivery plan written down and reviewed before any production code.

AI Systems Engineer

2026 · Contract

Two products for a construction supply and estimating platform

GeminiDocument extractionTypeScriptGoSupabase / pgvectorERP integrationOpenAPIDocker ComposeReactVite
  • Reads quantities straight off architectural drawings, and traces every figure back to the page it came from. Estimators won't trust a number they can't check.
  • Wired quoting to a legacy ERP so bids price against live inventory, assemblies and substitutes instead of week-old exports.
  • Both delivered as documented async pipelines against a published API contract, ready to hand to another team.

Mobile Team Lead & Mobile Fullstack

June 2025 — current · Remote/Hybrid

Mobile and web, full-stack delivery

FlutterRiverpodPythonFastAPIPostgreSQLRedisVue 3Docker ComposeCI/CD
  • Flutter apps with Riverpod/BLoC state management.
  • Full-featured CMS: FastAPI + PostgreSQL/Redis/S3 backend, Vue 3 frontend.
  • Architecture and infra: Docker Compose, Firebase auth, CI/CD, Nginx.

Fullstack Developer

2023 — 2025 · Remote

Product development, full-stack delivery

Vue 3FastifyPrismaPostgresMongoDBWebSocketsWeb3
  • Production NFT marketplace: Fastify, Prisma, Vue 3, WebSockets, Postgres, MongoDB.
  • Multi-provider auth — social logins and crypto wallets — with real-time trading.

AI‑Enhanced Systems Projects

2022 — Present · Consulting

AI integration, system architecture

FlutterRedisWeb3AI/MLMicroservices
  • Multi-channel notification service (email, WhatsApp, push, widget) on Redis queues.
  • Hybrid Web2 + Web3 authentication platform for creators.
  • Multi-platform Flutter app with real-time track editing and export.

Lead Fullstack Engineer – Web Projects

2010 — 2024 · Various

Backend, Frontend, UX, Integration, CI/CD

PHPVue.jsReactTypeScriptFlutterPyTorchSASSDesign Systems
  • Interfaces and backends for e-commerce, fintech and creative industries.
  • At Realaxy, trained a PyTorch classifier from scratch to tell architectural floor plans from everything else — my first pass at reading drawings, a decade before the estimating work above.
  • Early Flutter adopter — forked Flutter itself to make it run on Windows.

Education

Self-taught, continuously. Current focus: AI systems, applied ML, product architecture.

Contact & Links

Email: hans@grandpa.digital

LinkedIn: @hanslinger

Telegram: @hanslinger

Languages:  English (C1), Serbian (C1), Russian (native)