I help SaaS teams ship production AI features, modernize complex frontend platforms, and solve difficult integration problems. Available for focused consulting, diagnostics, delivery sprints, and fractional Staff-level engineering — and open to selected Senior, Lead, and Staff-level roles. 13+ years of production work: enterprise AI at Writer, autonomous driving at Zenseact / Volvo Cars, network security at Cato Networks, plugins at LottieFiles, streaming at MEGOGO, and Web3 wallets and DEXs (CTRL · Unizen · OneArt · HookRank).
I build AI product features at Writer, an enterprise generative AI platform: the workflow structure for autonomous multi-step agents, OAuth-based knowledge connectors that ground model output in customers' own data, enterprise identity (SSO / SCIM / IdP), and the frontend architecture underneath — including the Chrome extension.
Most of my recent work lives in private codebases, so this profile is a map, not a museum. The full picture is at leonidkuznetsov.xyz.
| Service | For teams that… |
|---|---|
| AI Product Delivery | have an AI feature stuck between demo and production |
| Frontend Development & Architecture | are building or scaling a React/TypeScript product |
| Performance Optimization | have a platform that became slow, fragile, expensive to change |
| Web3 & Wallet Product Engineering | build wallets, DEXs, NFT products, or dApps |
| Browser & Chrome Extension Development | need their product to live in the browser or another platform |
| Integrations & API Engineering | are blocked on OAuth, SSO/SCIM, webhooks, or flaky third-party APIs |
| Fractional Staff Engineer | need Staff-level ownership without a full-time hire |
Technical Strategy Session — $500 · 90 minutes → book a slot
- Building the workflow layer that makes enterprise AI agents usable — Writer
- One animation toolchain, shipped inside other companies' platforms — LottieFiles
- Making autonomous-driving telemetry visible, fast, and debuggable — Zenseact (Volvo Cars)
- Hardening a network-security admin platform while it kept shipping — Cato Networks
- Shipping Web3 products where a wrong click can cost real money — CTRL · Unizen · OneArt · HookRank
- Leading frontend delivery for national-scale live streaming — MEGOGO
Public code worth a look: smart-summarizer (Chrome extension, AI text summarization) · ae-sprite-sheet-exporter (Adobe After Effects CEP extension) · jsonresu.me (live personal product)
- From AI prototype to production: the workflow is the product
- Architecture lessons from shipping plugins into other people's platforms
- A practical performance diagnostic for complex React products
| BASED | Kyiv, UA |
| MODE | Remote · Intl |
| ENGAGE | Consulting / selected roles |
| FOCUS | AI · React · TypeScript |
| STACK+ | Plugins · Extensions · Web3 |
| STATUS | ● Available |
■ Tell me what is blocked, underperforming, or difficult to ship.Start a conversation · Book a call · js.leonid.kuznetsov@gmail.com