Lenka Kadlec

I help product companies and B2B platforms ship AI features that actually do things - and build the production systems that keep them running reliably.

Most teams get stuck at "we added a chat widget." I move them to "users can actually do things through AI": create projects, assign tasks, query data by voice or natural language - real state changes with confirmation and error handling, not a chatbot bolted onto the side.

What I bring:

- 10+ years building production systems across frontend and backend

- LLM tool calling and structured outputs that trigger real app actions

- Voice-driven workflows with proper confirmation, fallbacks, and latency tuning

- Production infrastructure: auth, RBAC, subscription billing, background jobs, caching, rate limiting, audit logging, E2E test coverage

- Shipped high-visibility features at Microsoft Teams (used by millions) and architected document-management and analytics platforms in large codebases (100k+ LOC)

How I can help you:

- Integrate LLM features into an existing product - agents, tool calling, structured outputs wired to real actions

- Build new AI-driven product features end to end (Next.js, TypeScript, React, Node)

- Add voice or natural-language workflows that hold up under real input variance

- Improve existing systems - refactor, add testing, reduce technical debt

- Lead technical direction for frontend or full-stack work, including API design and frontend–backend integration

I work best on:

- Product engineering with clear scope

- B2B, SaaS, and enterprise applications

- AI features that need to be reliable, not just demo-able

- Projects with defined technical ownership

Not a fit for:

- Consumer mobile apps or marketing websites

- Rescue projects without proper onboarding or context

- Unpaid trials or spec work

If you need a senior engineer who can ship AI features that do real work - and the infrastructure to keep them running - let's talk.