TheLis3k — Ksawery

Full-stack developer who ships end to end — from product framing and architecture down to the last pixel. Language-agnostic by choice: picks the right stack for the problem instead of forcing the problem into a familiar stack.

Snapshot

Role: Full-stack developer, automation engineer, product-minded builder, mentor.
Currently: Part-time IT student at PJATK; developer at Talentech on the product Weekli.
Operating principle: Clean architecture, SOLID, and shipping real value are the baseline — not the goal. Kaizen: leave every system better than he found it.
People instinct: Builds up the people around him as naturally as he builds software — workshops, pre-exam lectures, onboarding, conflict resolution, translating the incomprehensible into the obvious.

Why he's worth a conversation

He sits in the rare overlap between four roles most people only do one of:

As an engineer — Builds production systems solo, across the whole stack: React/Angular frontends, Spring Boot and NestJS backends, PostgreSQL/MongoDB data layers, Docker, CI, and the Bash/Playwright glue in between. Auth done right (JWT with rotating refresh tokens, invitation-based onboarding), not auth done "good enough." Learns the underlying model, not just the syntax.

As a tech lead — Thinks in systems, not tickets. At Talentech he architects automation for client migrations, eliminates entire categories of manual work, and drives integrations others wrote off as "too complex to automate." Translates fuzzy business needs into concrete technical designs — and trade-offs back into plain language stakeholders can decide on. Writes code the next developer can read. Runs sprint planning and dailies, leads internal workshops on Agentic AI, and built a meta-automation system that generates automation scripts automatically.

As a product manager — Builds things because they should exist, then makes them usable. Mobile-first, bilingual UX, real onboarding flows, design-agency finish on a one-person budget. Asks "should we build it, and what's the smallest version that delivers value?" — not just "can we?"

As a mentor and leader — Led a team of up to 12 people at AmRest: delegated, coached, resolved conflicts, introduced new procedures, and onboarded new staff. At Plac Zabaw Pingwiny managed up to 10 people, trained them on all attractions, resolved employee disputes. At Talentech ran an internal Agentic AI workshop for the engineering team and drove real adoption. At PJATK organises pre-exam study sessions for classmates, runs AI-cost and AI-tooling discussions in the PJATK{AI} science club, and helps non-technical colleagues understand what AI agents actually do and what they cost. He doesn't just know things — he makes sure the people around him know them too.

Skills

Tech: JavaScript, TypeScript, Java, Dart, Flutter, C#, .NET, React, Angular, Spring Boot, NestJS, SvelteKit, PostgreSQL, MongoDB, Drizzle ORM, Docker, Linux, Bash, Playwright, Cypress, Python, E2E Testing, CI/CD, Azure DevOps, Git, Vite, Product Analytics, Business Data Collection, AI Agents / Skills / Rules / Fine-Tuning.

Product & lead: Requirements gathering, scoping to an MVP, system integration design, process automation, technical-to-business translation, mobile-first UX, bilingual (PL/EN) product delivery, sprint planning, client relations.

People: Mentoring, staff training & onboarding, workshop facilitation, conflict resolution, team leadership (up to 12 people), translating technical language into plain human terms.

Soft: Fast learner, clear communicator, analytical problem solver, strong teammate, relentless about continuous improvement (Kaizen).

Education

Engineer's degree (in progress) — Polish-Japanese Academy of Information Technology (PJATK), Gdańsk, weekend mode. 2024 – present. Student council member, PJATK{AI} science club member, organises campus events, participates in budget planning, runs pre-exam study sessions and internal AI tooling workshops for classmates.
IT Technician diploma — Zespół Szkół Energetycznych, Gdańsk. 2019 – 2024. Certification: technik-informatyk-351203.

Work experience

Talentech — Technical Implementation Specialist (2025 – present, 7+ months). Automated the entire manual client-onboarding process; ran AI penetration tests; built cross-system integrations; migrated Angular views to React; led Agentic AI workshop; migrated E2E suite from Cypress to Playwright using AI agents; built an Agentic Repo that generates automation scripts automatically; ran sprint planning and dailies; maintained client relationships. Tech: Playwright, Cypress, Python, React, Angular, Java, Spring Boot, C#, .NET, Bash, Azure DevOps, CI/CD.
Exorigo-Upos — Mobile Field Service Technician (2025, 3 months). Remote and on-site hardware/software troubleshooting, process documentation, inventory optimisation, colleague training, positive KPI results.
AmRest — Product Manager (2024 – 2025, 6 months). Shift management, data-driven procurement, team leadership (up to 12 people), BHP & FSCC audit compliance, KPI ownership, mentoring, conflict resolution, staff onboarding, introducing new procedures and coaching the team through them.
Plac Zabaw Pingwiny — Assistant Venue Manager (2021 – 2024, 9 months seasonal). Led a team of up to 10 people: trained new staff on all attractions, resolved employee disputes, delegated duties, repaired electrical equipment, turned customer complaints into satisfaction.
thyssenkrupp — Data Analyst Intern (2021, 2 months). PHP, SQL, PowerBI, Excel; large-dataset dashboards and company-results reporting.
MaxCon — IT Technician & Sales Intern (2023, 2 months). Hardware consulting, IoT device repair & configuration, shipment management.

Selected projects

Each was designed, built, and shipped to production by one person unless noted.

CreativeShape — NFC-keychain start-up co-founded with a friend. Ksawery owns everything online: landing page, SEO, per-card meta tags, and a full CMS for card management. Heavy non-technical co-founder collaboration. React, Svelte, Drizzle, Tailwind CSS, Vercel. https://creativeshape.pl
Evenciki.pl — Event-planning platform built with university friends in one month. Mobile-first, bilingual (PL/EN). SvelteKit 5, NestJS, Drizzle ORM, PostgreSQL, TanStack Query, Tailwind, Bun. https://evenciki.pl
WizytówkaWeb — This portfolio. The comet flying through the DOM is a hand-built canvas animation system following a 1,500-point Catmull-Rom flight path — because a plain portfolio felt insufficient. React 19, TypeScript, Tailwind CSS, Vite, Canvas API. github.com/TheLis3k/WebFrontEndShowcase
Restaurant Admin — Full-stack restaurant system: public reservation/menu site plus a role-based admin panel, JWT auth with rotating refresh tokens, invitation-based onboarding. React, TypeScript, Spring Boot, PostgreSQL, TanStack Query, Zustand, Docker. github.com/TheLis3k/WizytowkaSandbox
RyboKalkulator — Mobile app for a friend at a fish counter: trilingual species names, photos, fast price calculation. Engineered for a low-end device (~1 GB RAM) — lightweight and snappy through a full busy season. Flutter, Dart, NoSQL DB, C++. github.com/TheLis3k/RyboKalkulator
How Much Is My Hot Wheels — Spring Boot REST API that scrapes eBay, Etsy, OLX, Vinted, and the Hot Wheels Wiki in parallel to aggregate live die-cast valuations. Java 21, Spring Boot, MongoDB, JSoup, Playwright, Docker. github.com/TheLis3k/how-much-is-my-hot-wheels
003-Expense-Tracker — First React project: charts, live currency conversion API, full RWD. React, JavaScript, CSS, ChartJS. github.com/TheLis3k/003-Expense-Tracker

Outside work

After hours he builds his own projects — currently running the CreativeShape start-up and developing more side-projects. He's a member of the PJATK{AI} science club, where he shares knowledge about AI tooling for developers, Agentic Repos, and LLMs. He regularly organises informal workshops and study sessions for university friends — he enjoys breaking down complex things into plain language. Reads mainly psychology, self-improvement, and productivity. To reset: gym, pool, and kayaking.

Languages

Polish — C2 (native)
English — C1 (fluent technical documentation, professional communication)
German — B1 (basic comprehension)