Marius Vlas - an engineer for startups

An engineer for startups

Senior Product Engineer with over 10 years of experience in SaaS and consumer startups. I own the full product - from UX and frontend, to backend and infrastructure, so you can move faster.

Book an intro call

15 minutes introductory call.

WHAT I BRING

Full product ownership

From UX to production infrastructure

I own the product end-to-end - from UX to production infrastructure. My technical range spans React and Angular on the frontend, Python and Node.js on the backend, LLM and NLP pipelines, and AWS infrastructure.

Full product ownership

From UX to production infrastructure

Decisions in practice

Aligned with the business goals

I’m used to operating as a founding engineer and technical founder at early stage startups. I own technical and product decisions while keeping the product aligned with the business goals.

Decisions in practice

Aligned with the business goals

I’m used to operating as a founding engineer and technical founder at early stage startups. I own technical and product decisions while keeping the product aligned with the business goals.

Engineering leadership

Raise the bar as we deliver

I’ve led cross‑functional teams of engineers, designers, QA, and product owners. I collaborate on the approach, make the key technical decisions, and raise the bar for the team as we deliver.

Engineering leadership

Raise the bar as we deliver

I’ve led cross‑functional teams of engineers, designers, QA, and product owners. I collaborate on the approach, make the key technical decisions, and raise the bar for the team as we deliver.

Case Studies

A selection of products I've owned or led - from first commit to production launch.

Inventex

US VC-backed legaltech startup

2024-2026

Founding engineer from first line of code; owned frontend architecture, infrastructure, product design, and product implementation.

Shipped a suite of B2B and B2C legal products on a single core platform - covering IP, property law, class‑action case management, and an AI‑native law‑firm offering, all on the same core platform.

Used by 10 000+ users across these products.

Founding Engineer

Inventex

Founding Engineer

US VC-backed legaltech startup

2024-2026

Founding engineer from first line of code; owned frontend architecture, infrastructure, product design, and product implementation.

Used by 10 000+ users across these products.

Alt Parts

Swiss AI‑powered automotive search startup

2024-2025

Technical founder, responsible for the entire tech stack and defining the product direction.

Defined the business model, product roadmaps, planned budgets, and prepared and delivered investor pitches and demos.

Built a multi‑source intelligent search engine via custom‑trained NLP models and LLM layers, reaching peaks of 30 000+ daily users and a featured booth at WebSummit 2025.

Technical & Product Founder

Alt Parts

Technical Co-Founder

Swiss AI‑powered automotive search startup

2024-2025

Technical founder, responsible for the entire tech stack and defining the product direction.

Defined the business model, product roadmaps, planned budgets, and prepared and delivered investor pitches and demos.

Built a multi‑source intelligent search engine via custom‑trained NLP models and LLM layers, reaching peaks of 30 000+ daily users and a featured booth at WebSummit 2025.

SenseCheck

UK-based legal document & legacy management platform

2020-2024

Led the frontend and UX, working both through Arkitecs and directly with the founding team, responsible for defining the UX, UI, and frontend architecture.

Re‑designed and rebuilt the application’s core workflows for lawyers, charities, and individuals managing legacy matters.

Shipped and iterated the platform into production for thousands of end-users across firms and organizations.

Frontend & UX Lead