CASE FILE · COHORT 2020
Ioannis Katri
// Full-stack Developer · Berlin, Germany 🇬🇷
THE STORY
Ioannis’s Path To Senior
- 01
Ioannis had hard problems in Berlin and nobody senior enough nearby to check his thinking against.
- 02
The program fixed that: experts close enough to ask anything. Architecture, testing, system design.
- 03
'Friendly but expert vibe.' His words.
- 04
Senior level. Salary up.
WHAT IOANNIS MASTERED
You were always close to me. It was a friendly but expert vibe.
Find Your Gaps To Senior.
20 minutes, zero fluff. Test yourself on the same dimensions Ioannis 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 IOANNIS’S WORDS
“You were always close to me. It was friendly but expert vibe.”
THE SENIOR JOURNEY
The senior skills Ioannis built
Getting to senior isn’t about learning another framework. Ioannis’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
Ioannis 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, Ioannis 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
Ioannis 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, Ioannis 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
Ioannis 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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