CASE FILE
Michał Sulwiński
// Senior Frontend Developer · Wrocław, Poland 🇵🇱
THE STORY
Michał’s Path To Senior
- 01
Michał had written off full-stack offers. Frontend was his lane. Backend felt like someone else's job.
- 02
He worked through the other half anyway: backend fundamentals, databases, APIs, cloud.
- 03
Then the offer came. Full stack. The one he thought was impossible.
- 04
Senior Frontend Developer in Wrocław, now with range across the stack. And a salary increase.
WHAT MICHAŁ MASTERED
I landed a full stack offer which at the time I thought was impossible to do.
Find Your Gaps To Senior.
20 minutes, zero fluff. Test yourself on the same dimensions Michał mastered — and get a breakdown of exactly what to work on next.
Your Skill Breakdown
THE OUTCOME
What changed at Senior level
Senior Frontend Developer
Substantial increase
Landed a new role
IN MICHAŁ’S WORDS
“I landed a full stack offer which at the time I thought was impossible to do.”
THE SENIOR JOURNEY
The senior skills Michał built
Getting to senior isn’t about learning another framework. Michał’s path covered the dimensions that actually move an engineer up a level — the same areas theSeniorDev coaches every member through:
System Design & Frontend System Design
Michał learned to lead system design and frontend system design discussions — scalability, data flow, and architecture trade-offs — the conversations that separate a senior senior frontend developer from a mid-level one.
Technical & Live-Coding Interviews
Instead of memorising answers, Michał built a repeatable process for technical interviews, live-coding challenges, and take-home tasks — shipping production-ready solutions under pressure.
Fundamentals: Testing, Performance & Software Architecture
Michał went deep on the senior fundamentals — testing, performance, and software architecture — and the mental models that outlast any framework or library.
The Architect's Mindset
Michał developed an architect's mindset: making technical decisions, driving architectural discussions, and holding their own with staff engineers and CTOs.
Selling Yourself & Communicating Senior-Level Value
Michał learned to communicate real engineering value — a senior-level CV, LinkedIn, and STAR interview stories — so the level showed long before the offer landed.
Free Senior Training.
One session, the whole system: the fundamentals, the interview strategy, and the plan Michał followed to the offer. Watch it free.
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