Serhii Lahutin — senior engineer, 10+ years, AI in production

Your idea, live in 48 hours. Free.

I build real-time voice agents, multi-agent LLM systems and complete SaaS products — installable apps with payments and accounts wired in, live for real users. Tell me what you want built and I'll take one idea at a time and ship it in 48 hours: deployed, working, on a link you can open.

I can make that offer because I ship whole products solo with AI — not because my time is cheap. You see it running before any money is discussed.

10+
years shipping production software
07
live products below — real users on them
04
built solo, end to end, with AI

01 — The offer

There is no way for you to lose money here.

Hiring a developer normally means paying before you have any evidence. So I removed that part. I build first, you look at the thing running, and money only enters the conversation if you decide you want it taken further.

Two things to know up front: it's built in public, so the idea is shared openly — and it's an installable web app that runs on phone, desktop and browser, not a native App Store build. It deploys under my account first and moves to yours whenever you want it. The code is yours either way.

02 — What I do

Ten-plus years of engineering, pointed at AI.

Deep in the Node.js ecosystem, now focused on getting real AI systems into production — the models, the agents, and the plumbing that keeps them honest.

03 — Selected work

Real products, with my fingerprints on them.

Products you can open and use right now — four I designed and built end to end with Claude Code, three I shipped as part of a product team.

Built solo with Claude Code — full SaaS, payments live
01
01

Vocavela

vocavela.live · real-time voice AI · 39 languages

Live voice conversation with an AI tutor that translates and corrects as you talk — plus camera translation for menus and signs, and a phrase library built from your own chats. A full commercial product: free tier, trials, subscriptions and lifetime plans on a live Stripe paywall. Designed and built end to end, solo, with Claude Code.

Visit the live product
02
02

Fitting Room

fittingroom.my · AI virtual try-on

An AI fitting room — shoppers see clothes on themselves before they buy, from any device. Designed, built and shipped solo on a production stack with Claude Code.

Visit the live product
03
03

Messaging.Quest

messaging.quest · multi-agent outbound · from $33/mo

Paste a URL, get a researched cold-email campaign. A crew of agents reads the site, works out who the buyer is, finds and verifies real people, registers and warms the sending domains (SPF, DKIM, DMARC), and writes one personal message per person from a proven fact — then sends it paced, and pauses itself if anything looks risky. The free pilot runs live in about ten minutes, and nothing sends without the founder's approval. Built solo, end to end, with Claude Code.

Visit the live product
04
04

The Quest Board

play.messaging.quest · builders helping builders

A proof-of-help exchange for people who just launched something. Do one honest quest for another builder — read their page, test-drive their product, or make a warm intro — and earn gold that buys the same help back on your own project. No upvotes and no review-swaps: every quest has a checklist, and an honest "this isn't for me" pays exactly the same as praise. A gold economy, a moderation model and a full product loop, built solo with Claude Code.

Visit the live product
Shipped with product teams
05
05

Smarter Contact

smartercontact.com · SMS + voice · CRM · real estate
Backend Engineer · Jul 2022 – Sep 2023 · Remote

An AI-powered text & voice communications platform with a built-in CRM — used by real estate investors, agencies and agents to automate follow-up and manage leads at scale. As a backend engineer I built a scalable Node.js service on GCP App Engine and an AI-powered Message Template Builder on OpenAI's GPT API.

Visit the live product
06
06

Bright Bird

brightbird.app · workplace mental health
Engineering team

A workplace mental-health platform — science-backed sessions and modules delivered through a mobile app, helping companies support employee wellbeing.

Visit the live product
07
07

Eurospay

euros-pay.com · cashless payments · fintech
Backend Developer · Niko Technologies · 2022

A cashless-payments platform, built as Node.js and NestJS microservices talking to blockchain payment APIs. I developed and maintained the backend as part of the team at Niko Technologies.

Visit the live product

04 — About

Ten-plus years of shipping — now building with AI.

I'm a software engineer with ten-plus years behind me, most of it deep in the Node.js ecosystem. The last stretch has been all AI: real-time voice agents, multi-agent systems on LangChain and Deep Agents, and the LLM integrations that quietly do the work inside real products.

I work two ways. Solo, I design and ship complete products end to end with Claude Code and Codex — not prototypes, but installable PWAs that run on phone, desktop and browser with payments and accounts live. Vocavela, Fitting Room, Messaging.Quest and The Quest Board are all live right now. Embedded in a team, I've helped build and ship platforms used by real companies: Smarter Contact, Bright Bird and Euros Pay.

Beyond building, I consult on AI architecture, code quality and production readiness — and I audit and fix AI-assisted, “vibe-coded” apps that need a steadier hand before they scale.

Get in touch

Send me the idea.

Worst case, you walk away with a full build plan for free. Best case, you open a link in two days and it's the thing you described. Hiring, a project, a second opinion on an AI build, or a “vibe-coded” app that needs a steadier hand — same door.