Mikołaj Sumera
I build scalable B2B apps, AI automations, and architectures that hold up under load. No overengineering — just what delivers business value.
Professional Profile
Solid Fullstack Developer with 3+ years of commercial experience at two B2B companies: PGF (pharmaceutical) and LSI Software (HoReCa, hospitality, logistics).
I specialise in Angular, React/Next.js and Symfony. I build SPAs, PWAs, CMSs and WMS systems — from straightforward CRUDs to complex multi-module platforms serving thousands of users.
On the side I build my own automations with n8n and the OpenAI API — eliminating manual repetitive work and cutting lead response times from hours to minutes.
Fast ramp-up
New projects picked up in days, not weeks
Zero production bugs
Priority: clean, tested, reviewable code
AI-first mindset
AI as a tool — not a buzzword
Team player
Scrum, code review, pair programming
Skills
Frontend
Complex SPAs, RWD and PWAs — performant, accessible, animated.
Backend
REST APIs, MVC/DDD, ORM, auth, testing.
Databases
Relational & NoSQL, query optimisation, migrations.
DevOps & Tools
Containerisation, CI/CD, monitoring, project management.
Automation & AI
No-code/low-code workflows, LLM integrations, AI agents — my niche.
Projects
Portfolio + CV — sumera-dev.com
This very project. Bilingual, SEO-optimised, and fully responsive.
Modern bilingual portfolio & CV built on Next.js 16 (App Router), Tailwind v4 and Framer Motion. LazyMotion, CSP hardening, JSON-LD ProfilePage — zero quality compromises.
GuardFlow AI Proxy
Secure LLM gateway — rate-limit, cache, full audit log.
Scalable API Gateway securing access to LLM endpoints. Handles rate-limiting, caching and log auditing for intelligent AI agents.
Smart Lead Automation (n8n)
Lead handling time: ~4h → <5 min. Zero manual work.
Complex n8n workflow wiring contact forms directly into a CRM. LLM intent analysis, automatic lead scoring and personalised draft reply generation.
E-Commerce HoReCa SPA
B2B ordering system processing dozens of restaurant orders daily.
Full-stack B2B ordering system using Angular (frontend) and Symfony (backend/API) via Doctrine ORM. Modules: orders, invoices, product catalogue.
Experience
Frontend Developer — Angular
Polska Grupa Farmaceutyczna (PGF)
🎯 Applications running in a pharmaceutical environment — systems for pharmacies and patients.
- 1Contributed to building a real-time webinar streaming app with recording integration and live chat moderation.
- 2Delivered the 'Aptomat' frontend — a 24/7 automated medication pickup system based on a parcel-locker model.
- 3Developing 'Pharmacist's Assistant' — an SPA for wholesale drug ordering and invoice management, replacing a legacy system.
- 4Maintain and develop a WMS integrating several backend systems.
- 5Working in Scrum: daily standups, sprint reviews, code reviews in a small frontend team.
Full Stack Developer — Angular & Symfony
LSI Software
🎯 Systems running live in dozens of hotels, cinemas, restaurants and pizza chains across Poland.
- 1Delivered a PWA for a nationwide 200+ outlet pizza chain — sub-2s load, offline mode, installable on any device.
- 2Co-built a HoReCa CMS managing POS terminals, receipt printers and digital menus across a restaurant network.
- 3Built hotel reservation systems — room availability, payment integration, reporting dashboards.
- 4Developed cinema (screening scheduling, ticket sales) and golf course (tee-time booking) management platforms.
- 5Optimised SQL queries for WMS apps handling hundreds of warehouse transactions per day.
Education & Languages
Education
Computer Science — Engineering (part-time)
Lodz University of Technology
Studying alongside full-time employment
IT Technician
Technical School No. 10, Łódź
Diplomas INF.02 and INF.03 — passed first attempt
Languages
Let's talk
Looking for an ambitious specialist with a solid approach to code and business? Or an experienced generalist who delivers without micromanagement? Write — I'll reply within 24h.
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