Mikołaj
Sumera.
I build scalable B2B apps, AI automations and architectures that hold under load. No overengineering — just what delivers business value.
Solid Fullstack Developer with 3+ years of commercial experience at two B2B companies — PGF (pharmaceutical) and LSI Software (HoReCa, hospitality, logistics) — and a portfolio of 2 SaaS products running solo in production (KorepAI, NullQuest).
I specialise in Next.js / TypeScript, Angular and Symfony. I ship SPAs, PWAs, CMSs and WMS systems — from CRUDs to multi-module platforms serving thousands of users — with full SaaS infrastructure (Supabase, Stripe, Vercel, Cloudflare).
In my own products I integrate Claude API, ElevenLabs TTS and Web Speech API in full voice pipelines. Career direction: Data Science / AI Engineer — moving up from a Full Stack with a real production AI track record.
NullQuest — nullquest.dev
Duolingo for developers
RPG-style learning platform for programming (JS/TS/SQL/Python/DevOps). Character classes, XP system, Boss Fights with timers, Training Purgatory, factions, skill trees. Multi-model Claude API routing: Haiku 4.5 (cheap) vs Sonnet 4.6 (complex). Bilingual EN/PL.
GuardFlow AI Proxy
Secure gateway for LLMs
Scalable API Gateway protecting access to language models. Rate-limiting, cache, full audit log, Kong integration.
Smart Lead Automation
n8n + OpenAI
Workflow wiring contact forms into a CRM. LLM intent analysis, automatic lead scoring, personalised draft generation.
E-Commerce HoReCa SPA
B2B ordering system (LSI)
Full-stack ordering system using Angular (frontend) and Symfony (backend) via Doctrine ORM. Order configurator, POS device integration, invoices, product catalogue.
Specialised SPA apps (Angular) for the pharmaceutical industry — WMS, CMS, systems for pharmacies and patients.
Systems running live in dozens of hotels, cinemas, restaurants and pizza chains across Poland.
Let's talk.
Looking for an ambitious specialist with a strong approach to code and business? Or an experienced generalist who delivers without micromanagement? Write — I'll reply within 24h.
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