Principal Software Engineer & Architect — AI-first MVPs, distributed systems, APIs, and reliable infra.

• Solve: AI-first MVPs, distributed/real-time systems, and untangling legacy without slowing delivery
• Own: scope → architecture → build → ship → observability, plus clean APIs/data models and standards
• De-risk: align early, communicate often, document decisions, and leave teams with maintainable systems

• Design and deliver your first production-ready version — architecture, implementation, and infrastructure included
• Untangle infrastructure, APIs, and data models so teams can ship faster
• Introduce LLMs without creating brittle logic — schemas, contracts, guardrails, and testability built in

• Founders who need a senior engineer who can design, build, and ship autonomously
• Agencies that want a high-trust senior partner to deliver complex projects
• Teams that need an architect to bring order, clarity, and speed

• System architecture — distributed systems, real-time, event-driven
• AI-first design — RAG pipelines, agents, evals, automation
• High-speed MVP execution: 0 → prototype → production
• API platforms and data contracts (clear interfaces teams can ship against)
• Cloud infra — Cloudflare, GCP, Bun/Node, PostgreSQL, Terraform
• Observability and reliability practices

• Pragmatic first; ship small slices weekly and bias to action
• Align early, communicate often, and document decisions
• Prefer simple, proven systems; spend few innovation tokens; use AI to cut time-to-value

• AI-driven property platform: Overhauled evaluation + CRM; cut agent prep time in half, boosted conversion.
• Real-time co-sell dashboard: B2B pipeline aggregation; teams closed deals 30% faster.

• Turn vague ideas into a clear scope, risks, and success metrics
• Produce a concise spec, architecture sketch, and delivery plan
• Ship a functional MVP in 4–8 weeks with telemetry and onboarding in place
• Set up CI/CD and preview environments, with docs and standards for handoff

• WS-Kit — type-safe WebSocket RPC framework that ships real-time features faster and safer than hand-rolled sockets
• React Starter Kit — full-stack SaaS template used by hundreds of teams, cutting MVP build time by ~70%
• SyncGuard — type-safe real-time sync for multi-client apps without writing conflict logic

"Konstantin is the steady technical hand every early-stage team hopes to find... avoids mountains of technical debt while keeping the team moving fast." — Azad A., Head of Product

"His specialty is infrastructure and architectural design... always up to date on bleeding-edge tech." — Kavin P., Founder & COO

"We wouldn't have shipped our MVP without him." — Mike F., Founder

• Book a session: https://cal.com/koistya
• Connect on LinkedIn: https://linkedin.com/in/koistya
• Ask a question: open an issue or join Discord

• Backend & Infra: Node.js, Bun, PostgreSQL, Redis, Cloudflare, GCP, Terraform
• Frontend: React, Next.js, Vite, TanStack, Tailwind, shadcn/ui
• AI & Automation: Vertex AI, Gemini, Claude/Claude Code, RAG pipelines, agents
• DevOps: Docker, Cloud Run, GitHub Actions, CI/CD, observability (logs/metrics/traces)

Off the clock: VR table tennis, strong espresso, wandering Italy.