I am Maciej Kankowski, an independent frontend tech lead. For 10+ years I have delivered enterprise platforms on fixed-scope B2B contracts: technical direction, legacy modernisation, and AI-native workflows that change how a team actually ships.
Leading a six-person frontend chapter inside a 40+ engineer program. This year: five frontend apps, component library included, brought onto React 19, Vite and Node 22, a release train I run as release master, and a governed AI workflow the whole team ships with. Under contract with Jit Team. The full breakdown.
Four situations I have been contracted to fix. If one of them is your quarter, we are talking about the same problem.
Every release costs more than the last one, coverage is thin, and nobody volunteers to touch the oldest modules. The rewrite branch is not an option, so modernisation has to happen on a system that stays in production.
Six capable engineers pulling the architecture in six directions. Decisions get made inside pull requests instead of before them, and the same discussion reappears every sprint.
Everyone has a licence, everyone prompts differently, and none of it is visible in the release process. The output is uneven and the gain is impossible to measure.
Deploys are rare because they are risky, and they stay risky because they are rare. Fixing the loop is usually worth more than any single feature on the board.
Fourteen months on one program, in detail: what I found, what I changed and what came of it. All four situations above, in one place. The fastest way to judge the fit.
Enterprise workforce-management platform for a global HR and staffing business: five frontend apps, a shared component library among them, built by a program of about 46 people on a monthly release train. Under contract with Jit Team; the end client is withheld under NDA.
Joined. Design-system groundwork and features in the talent app.
Feature flags and release automation. Release 5.0 across four apps, with onboarding rebuilt as a reusable micro-frontend.
Component library kick-off. Medallia in the main app. The team moves from Copilot to Claude Code. My first release as release master.
Component library published. A written release process. The four-app migration, in production in June.
GlobalLink Strings (then Applanga) integrated. New planning module.
Dependency updates on Renovate. Automatic Zod validation. UX process launched. Redesign roadmap, and the team reorganised around it.
Leading the redesign of the entire app.
Four ways to contract me. Each one has a defined deliverable, agreed milestones and an end date.
A contracted mandate to set technical direction and unblock delivery. Term, milestones and acceptance criteria fixed before the first commit.
Turn a long-lived, hard-to-change product into a maintainable, component-driven stack, as a phased migration rather than a freeze.
Multi-agent and AI-assisted workflows across the SDLC, built into the pipeline instead of into individual editors.
A clear-eyed review of architecture, performance, testing and release process, delivered as a prioritised action plan with no filler.
All four are contracted and invoiced by mackan.it Maciej Kankowski on B2B terms. I supply my own equipment and software, take no exclusivity and run several clients in parallel, including the website clients of my studio. Full engagement terms.
Before the current engagement. Delivered under contract with Jit Team, a Gdynia software-engineering consultancy that places specialist contractors with international clients. End clients are generalised by industry under NDA.
Cloud-native web client for a stock-transfer platform spanning the entire EMEA region, including AI-assisted load recommendations. I owned end-to-end testing for the product.
Led a small team delivering a health-sector web application and a native iOS app integrating wearable health data, taking them from MVP to production. Owned the iOS release process, from version tags to app signing, and ran builds and deployments on the team's existing AWS setup.
Modernised a security-critical financial system over roughly two years. Design-system-aligned work seeded three new products, and I guarded the release process as Scrum Master while driving frontend performance.
Greenfield internal platform with map-based 3D visualisations. I joined as the first engineer on the account and helped grow it into roughly five parallel workstreams and about twenty people, leading interactive UI and UX prototyping.
Earlier in my career I also shipped native mobile apps (iOS with Swift, Android with Kotlin) and full-stack web. Useful context, but the work above is where I focus today.
Beyond autocomplete. I design the system around the model, so it behaves like a reliable teammate inside a real delivery pipeline.
Specialised agents for planning, implementation, review and test that hand work off to each other and keep humans in the loop where it matters.
Generation, refactoring and code review wired into branching, CI and the release process, not bolted on after the fact.
Agentic tooling used to map, document and incrementally modernise a large, long-lived codebase without freezing delivery.
The patterns, guardrails and review culture that let a whole team adopt AI safely and consistently, and that cover the AI-literacy duty the EU AI Act (Art. 4) puts on every company using AI. Raising the floor, not just the ceiling.
No surprises after the signature. The scope is written down before anything starts.
What is slow, what is at risk, and what "done" would look like for you.
I write the scope, the milestones and the acceptance criteria. You approve them before work starts.
I work in your repository and your process, reporting against the milestones we agreed.
Documentation, patterns and pipelines stay with your team. The engagement has an end date.
What I bring to a contract, and where the edges of it are.
One page, kept current. Frontend tech lead, 10+ years, enterprise platforms across five sectors. The web version reads better on a phone.
The short answers. Anything else goes in the email.
Run a local business rather than an engineering program? That work goes through my studio: fast, mobile-first, SEO-ready business sites in Polish or English, with design, copy, launch, domain, SSL and hosting handled end to end. Over 8 business sites live.
