Senior Software Engineer · Node.js & AI · 12 years

Serhii Lahutin

I build real-time voice agents, multi-agent LLM systems and production SaaS — solo with Claude Code, or embedded in your team.

Find me LinkedIn Upwork Telegram GitHub Email

Book a 30-min call → Message me →

Fluent English · Agile · Portugal · Remote · open to consulting & build work.

12+

years shipping production software (Node.js)

live products below — real users on them

shipped inside product teams

built solo, end to end, with Claude Code

01 — What I do

Twelve 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.

▹12 years of software engineering, with deep expertise in the Node.js ecosystem.
▹Building real-time voice agents.
▹Developing multi-agent systems using LangChain and Deep Agents.
▹Implementing AI automations and integrating LLMs into products and business workflows.
▹Using Claude Designs to rapidly iterate on UI/UX.
▹Daily use of Claude Code and Codex for AI-assisted software development.
▹Consulting on AI architecture, code quality and production readiness.
▹Auditing and fixing issues in AI-assisted (“vibe-coded”) applications.
▹Fluent in English and experienced with Agile methodologies.

02 — Selected work

Real products, with my fingerprints on them.

05 live products · 02 solo · 03 with teams

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

Built with Claude Code — solo

live · solo build

01 — BUILT WITH CLAUDE CODE

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 →

live · solo build

02 — BUILT WITH CLAUDE CODE

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 →

Shipped with product teams

live · team build

03 — SHIPPED WITH A TEAM

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 →

live · team build

04 — SHIPPED WITH A TEAM

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 →

live · team build

05 — SHIPPED WITH A TEAM

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 →

03 — About

Twelve years of shipping — now building with AI.

I'm a software engineer with twelve 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 — Vocavela and Fitting Room are both live, paywalls on. 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.

LinkedIn Upwork Telegram github.com/theic serhiilahutin@gmail.com Portugal · Remote

Get in touch

Let's build something.

Hiring, a project, a second opinion on an AI build, or a “vibe-coded” app that needs a steadier hand — a 30-minute call is the fastest way to find out if I can help.

Book a 30-min call → Message me on Telegram →

Or reach me directly — LinkedIn · Upwork · serhiilahutin@gmail.com