/01
Systems that last.
Three-year solutions, not three-week prototypes.
Idempotent pipelines. Reproducible builds. Auditable decisions. When we ship something, it should still run the day we step away from it.
We build systems that hold.
ZER0ONE is a senior engineering studio. No agency template, no buzzword clouds. We are engineers who have learned which decisions come back to haunt you in three years — and which carry a company. What follows are not value posters: they are the rules by which we close every ticket.
Principles
/02
Architecture before features.
We model before we type.
A clean domain boundary saves six months of refactoring. Model first, interfaces first, invariants first — code later. Every bug we chase is a decision made too early.
/03
Simplicity before abstraction.
Abstraction when it earns it — not just in case.
Three similar lines of code are not a refactor mandate. Generalise on the fourth occurrence, not before. Pre-emptive generics are technical debt with an asterisk.
/04
Observability from day one.
If it wasn't logged, it didn't happen.
Metrics, structured logs, health checks and alert rules belong in the first PR. A system you can't see is a system you can't fix. The nervous system ships with the product.
/05
We know how to say no.
To scope we can't ship with quality.
No to deadlines that break the product. No to stacks we haven't mastered. No to projects where we're the wrong address. A clear no is worth more than half a yes.
/06
Engineers, not salespeople.
No pitch-deck theatre.
We talk in numbers, code and trade-offs. No AI-powered-synergy slogans, no buzzword clouds, no roadmap poetry. When we claim a skill, the running proof sits under /projekte.
How we work
01
Discovery
We listen before we estimate. Understand the problem, not just the wish. Identify invariants, constraints, the real priorities.
02
Architecture
Domain boundary, data model, integration map. An explicit plan on paper before the first line of code is written.
03
Build
Iterative, with real tests, real metrics, real releases. Observability and CI ship before feature two. You get what you need — not what sounded loudest.
Michael Jajagin
Senior Software Engineer · Founder
Ten-plus years of engineering — full-stack, data integration, machine learning. The past few years almost entirely remote for German and Austrian mid-market companies.
ZER0ONE is my own studio. What you see here I build myself: no account manager in the middle, no intern touching the code, no subcontractor in the delivery chain. If you call, I pick up.
Every project I write, test and deploy personally. You get one point of contact — not a ticket in a queue. And what I commit to, I keep.
Studio
ZER0ONE OÜ (Estonia, in formation)
Dunavska obala 79
25245 Bogojevo, Serbia
Dunavska obala 79
25245 Bogojevo, Serbia
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