Skills

Backend & APIs

The engine room — typed services, clean data models, and REST/GraphQL APIs built to scale. We design backends you can reason about, test, and grow without nasty surprises.

30 min with a full-stack devAll services

Proof, not promises

Backend & APIs we've shipped

Groomershop — One order cockpit for a high-volume store
Commerce · Order management
Groomershop

One order cockpit for a pet-supplies store doing tens of thousands of orders a month — mirrored live from a desktop ERP with no API.

Covo — An eSIM wallet for international travelers
Fintech · Travel / eSIM
Covo

The backend and mobile apps behind a travel eSIM wallet — an append-only multi-currency ledger, family pooling, instant top-ups.

Edube — An AI tutor that teaches understanding, not answers
EdTech · AI
Edube

Building an AI-native learning platform for Polish matura students — a Feynman-style AI tutor with real-time voice, adaptive learning paths and LLM-generated practice.

MyEvaluations — Medical-training SaaS modernized without a rewrite
SaaS · Healthcare / EdTech
MyEvaluations

Modernized a 20-year-old C# monolith powering most US health universities — incrementally, no big-bang rewrite.

Tournee — Run tournaments without breaking a sweat
SaaS · Sports
Tournee

A modern tournament-management SaaS — registration, automated brackets, live scores — across web, iOS and Android from one codebase.

Tripsomnia — Book and sell local tours worldwide
Marketplace + SaaS · Travel
Tripsomnia

Built an international tours marketplace + operator SaaS from scratch, and advised the founders through fundraising.

TerazZaraz — Job offers and your friends in one place
Web · Jobs / Social
TerazZaraz

A Polish social job aggregator — 'LinkedIn before LinkedIn' — tuned for ~40M monthly page views.

GorillaFM — An interactive online radio station
Web · Music / Realtime
GorillaFM

A super-interactive online radio: live chat, song requests, profiles and ranks, realtime over WebSockets.

Slowniki-Pro — Commercial dictionaries online
Web · Publishing / Payments
Slowniki-Pro

Moved specialist dictionary publishing online — public portal, reseller panel, and a browser-based editor — built from scratch.

How we think, not just what we type

Concepts & patterns we work in

The ideas behind the tools — the patterns we've applied in production, not buzzwords.

Domain-driven designMicroservices & modular monolithsEvent-driven architectureStrangler-fig migrationAPI gateway patternGraphQL federationAuthentication & authorization (OAuth · SSO)Clean / hexagonal architectureTest-driven developmentBackground jobs & queues

Languages, frameworks, infra

What we actually use

The tools and languages we have real, shipped experience in — not a wish list.

Languages
Frameworks
APIs
RESTWebSockets
Data stores
MikroORM
Queues & streaming
BullMQ

On the record

Talks & writing on this

We've stood at conferences and meetups explaining how this works — and written it down. Slides, video and articles below.

Treat Type Definitions with respectVideo4Developers · 2022Elixir for Ruby developersSlidesPoznań Ruby User Group · 2015

All talks & writing →

Upstream, not a fork

We don't just use it — we contribute to it

Merged pull requests to the upstream projects this capability is built on. Evidence, not a claim — it's pulled from GitHub and can't be faked.

mikro-orm/mikro-orm14 mergedTriPSs/nestjs-query6 mergednestjs/graphql2 mergednestjs/swagger1 mergedelixir-ecto/ecto1 mergedapollographql/federation1 merged

See all our contributions →

Bring the napkin sketch.

Thirty minutes with a full-stack engineer, plus a short written report that's yours to keep.

30 min with a full-stack devSee services →

30 minGoogle Calendarno sales deck

Prefer to write? Send us a message →