CASE FILE · COHORT 2021
Renee Duijzers
// Full Stack Developer · Amsterdam, Netherlands 🇳🇱
THE STORY
Renee’s Path To Senior
- 01
Renee's problem wasn't effort. It was aim. She didn't know her actual gaps, so every study hour was a guess.
- 02
First step: find the gaps. Architecture, system design, testing, CS foundations. A clear readout of where she stood.
- 03
Then close them. One by one.
- 04
A much better job in Amsterdam, with a salary increase. 'I really found my gaps.' Her words.
WHAT RENEE MASTERED
I really found my gaps. I gained lots of confidence and a much better job.
Find Your Gaps To Senior.
20 minutes, zero fluff. Test yourself on the same dimensions Renee mastered — and get a breakdown of exactly what to work on next.
Your Skill Breakdown
THE OUTCOME
What changed at Senior level
Substantial increase
IN RENEE’S WORDS
“I really found my gaps. I gained lots of confidence and a much better job.”
THE SENIOR JOURNEY
The senior skills Renee built
Getting to senior isn’t about learning another framework. Renee’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
Renee learned to lead system design and frontend system design discussions — scalability, data flow, and architecture trade-offs — the conversations that separate a senior full stack developer from a mid-level one.
Technical & Live-Coding Interviews
Instead of memorising answers, Renee 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
Renee went deep on the senior fundamentals — testing, performance, and software architecture — and the mental models that outlast any framework or library.
The Full Software Lifecycle: Backend & Cloud
Moving beyond the framework, Renee grew across the full stack — backend and cloud — to deliver end-to-end and become the go-to engineer on the team.
Selling Yourself & Communicating Senior-Level Value
Renee learned to communicate real engineering value — a senior-level CV, LinkedIn, and STAR interview stories — so the level showed long before the offer landed.
Find Your Technical Gaps.
Test your skills against real technical interview questions and find out what to focus on next.
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