Currently shipping:Rebatik & Westorehub — both in production

Available for work · 2026

Shota Bosikashvili.

Full-Stack Engineer — Builds production SaaS end-to-end — multi-tenant, payments, infra, the lot.

Full-stack engineer with 4+ years of experience shipping production SaaS end-to-end — 4 platforms designed, built, and deployed solo with multi-tenant architecture, async workflows, and real payment systems (Stripe, Stripe Connect, Paddle). Comfortable owning a stack from Next.js edge middleware down to PostgreSQL schema design, Kubernetes manifests, and CI pipelines. AI-directed development daily (Claude Code, Codex, Gemini).

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01Career timeline

Experience.

2025 — Present
rebatik.com
Full-Stack Engineer
Cashback marketplace with affiliate tracking — Remote.
- Designed a double-entry ledger that computes balance from CREDIT/DEBIT rows; idempotency keys with unique indexes block double-credits under affiliate webhook retry storms.
- Integrated 6 affiliate networks (CJ, Impact, ShareASale, Admitad, Awin, FlexOffers) with per-network HMAC verification, UUIDv7 click attribution, and a nightly reconciliation worker running 9 integrity checks.
- Shipped resilience patterns end-to-end — circuit breakers, sliding-window Redis rate limiting, CSRF double-submit tokens, Testcontainers for real Postgres tests. 124 unit + 61 integration + 3 Playwright.
2024 — Present
westorehub.com
Full-Stack Developer
Warehouse Rental Marketplace — Tbilisi, Georgia · Remote.
- Eliminated 401 auth stampedes with a reentrant-safe refresh-token queue coordinating parallel requests behind a single in-flight /auth/refresh.
- Designed the listing and availability subsystem — multi-step Zod-validated wizard, two-month calendar with three overlapping date layers, and a conflict-detection endpoint.
- Owned build, deploy, and conventions — multi-stage Dockerfile, GitHub Actions CI with 60-second health-check gates, Hetzner deploys; codified a Service → Hook → Page pattern across 12 domain resources.

02Selected work

Projects.

Each project solved a problem someone was paying for — or running every day.

Case · 01 / 03

ContractFlow AI

Multi-tenant SaaS · Production · TypeScript monorepo

Architecture: 3 runtimes · monorepo
Tenancy: Multi-tenant · 4-role RBAC
AI failover: Gemini → OpenAI

Production multi-tenant SaaS for marketing agencies — AI-drafted contracts, approval workflows, and end-to-end client billing.

Multi-tenant organizations with 4-tier RBAC (Owner / Admin / Member / Viewer); 5-state document workflow Draft → Review → Sent → Signed → Paid.
Streaming AI drafts over Server-Sent Events with provider failover (Google Gemini → OpenAI), generated by an async BullMQ worker.
Custom HMAC-SHA-256 sessions, nonce-based CSP, Cloudflare Turnstile bot protection, Redis sliding-window rate limits, Paddle billing across three tiers.
Multi-stage Docker, Caddy with automatic TLS, GitHub Actions CI/CD, Sentry monitoring.

TypeScript
Next.js 16
React 19
NestJS
Prisma
PostgreSQL
Redis
BullMQ
Server-Sent Events
Google Gemini
OpenAI
Paddle
Docker
GitHub Actions
Railway
Sentry

Live Case studyFinished · Solo build

Case · 02 / 03

Lumina Marketplace

Production marketplace · AI semantic search · 8-language i18n

Database: 25 tables · Drizzle ORM
API surface: 80 REST endpoints
Localization: 8 languages · next-intl

Production rental marketplace with AI-powered semantic search, map-based discovery, payments, and 8-language localization.

Three-tier search: pgvector HNSW for semantic matching, Meilisearch for typo-tolerant facets and geo, PostgreSQL full-text as graceful fallback.
Mapbox GL with Supercluster clustering, Stripe Connect for marketplace payments and host payouts, OAuth 2.0 with Google and Apple.
AI-streamed listing descriptions via the Anthropic Claude API, OpenTelemetry distributed tracing to Jaeger, PWA with offline fallback.
Multi-stage Docker and Kubernetes manifests with cert-manager TLS; 58 unit/integration tests + Playwright E2E in GitHub Actions CI.

TypeScript
Next.js 15
React 19
Drizzle ORM
PostgreSQL
pgvector
Meilisearch
Redis
BullMQ
Mapbox GL
Stripe Connect
Anthropic Claude
OAuth 2.0
OpenTelemetry
Docker
Kubernetes

Live Case studyFinished · Solo build

Case · 03 / 03

AI Chess Coach

Production SaaS · Real-time AI · Global subscription billing

AI providers: 3 (Gemini · Claude · OpenAI)
Payment processors: Stripe + Paddle (MoR)
Engine compute: Client-side · $0 server

Production SaaS for AI-powered chess coaching — real-time engine analysis, voice commentary, and globally compliant subscription billing.

Pluggable multi-provider AI: Google Gemini, Anthropic Claude, OpenAI; ElevenLabs and OpenAI text-to-speech driving voice commentary.
Dual-processor billing — Stripe for primary regions, Paddle as Merchant of Record for global VAT compliance — feeding a unified Subscription model.
NextAuth v5 with Google and GitHub OAuth 2.0, signature-verified idempotent webhooks, Redis sliding-window rate limits for LLM cost control.
Redis-cached active-game store with PostgreSQL archival for cross-device session resume; deployed on Railway via Docker.

TypeScript
Next.js 16
React 19
Tailwind CSS 4
Stockfish WASM
Prisma 7
PostgreSQL
Redis
WebSocket
NextAuth v5
OAuth 2.0
Google Gemini
Anthropic Claude
OpenAI
ElevenLabs
Stripe
Paddle
Vitest
Playwright

Live Case studyFinished · Solo build

03Tooling

The deliberate stack.

Boring on purpose. Each tool earned its spot by surviving production for at least a year.

Frontend

React 19
Next.js 15/16
TypeScript
Tailwind 4
shadcn/ui
Zod

Backend

NestJS
Hono
Node.js 20
REST + OpenAPI 3.1
Server-Sent Events

Databases

PostgreSQL
Prisma
Drizzle ORM
Redis
pgvector (HNSW)

Auth & Payments

NextAuth v5
Better Auth
Custom HMAC sessions
Stripe + Stripe Connect
Paddle (Merchant of Record)

Infrastructure

Docker (multi-stage)
Kubernetes
Railway
Vercel
GitHub Actions
BullMQ
Cloudflare
OpenTelemetry

AI Tooling

Anthropic Claude
OpenAI
Google Gemini
Claude Code
MCP Servers

Testing & Collaboration

Vitest
Playwright
Testcontainers
k6 load tests

04Credentials

Where I studied, and what I speak.

Georgian Technical University

Oct 2017 — Jul 2021

Bachelor of Business Administration (BBA)

Languages

English (Professional)·Georgian (Native)

Shota Bosikashvili.

Full-Stack Engineer

Full-Stack Developer

ContractFlow AI

Lumina Marketplace

AI Chess Coach

Georgian Technical University