Real-time & high-throughput systems
Event pipelines, streaming integrations and the back-office around them, for systems that can't drop a message. Latency and reliability are the spec, not an afterthought.
- Low latency
- Event pipelines
- Reliability
Software studio
Engineering that compounds.
A senior team building software across the whole spectrum — from product to platform, shipping SaaS for our clients and for ourselves. From your first request we design, build and run it live — then stay in it with you, adjusting it on demand as your business moves.
- 10+ yrs senior
- With you past launch
- Request
- Built & shipped— tested, in production
- Live in the cloud— autoscaled, monitored
- We stay on— long after launch
What we do
One team for the whole stack.
Production-grade engineering across every layer — from the first request to working software, live in the cloud, and kept moving long after launch.
Applied AI
We understand AI and put it to work only where it genuinely helps — the right approach in the right place, integrated and measured, never bolted on for show.
- LLMs
- Automation
- Integration
Web & product engineering
From a sharp marketing site to a full SaaS — designed, built and shipped by people who've done it for a decade. Fast, accessible, measurable.
- Any framework
- Design systems
- SaaS
Cloud & DevOps
Infrastructure that scales quietly: infrastructure-as-code, CI/CD, observability and a cloud bill you can actually read.
- AWS
- Terraform
- CI/CD
Blockchain & smart contracts
On-chain logic, written deliberately and reviewed hard. Contracts, integrations and the off-chain plumbing that makes them usable.
- Solidity
- Move
- Audits
Backend & legacy modernization
APIs and data layers built to last — and tired systems brought back to life without betting the company on a full rewrite.
- APIs
- Data
- Migrations
Beyond launch
We don't hand it over and walk away.
Most studios ship and disappear. We stay in it with you — adjusting the product on demand as your needs shift, handling whatever comes up, and, when the time is right, helping you take it further and in front of the right people.
On demandChanges & fixes
End-to-endBuild, run & grow
Past launchWe stay in it
How we work
Discovery to delivery, in the open.
A deliberate sequence with the risks named up front. You always know what's shipping next.
- 01
Discover
We map the problem, the constraints and the economics before a line of code.
- 02
Design & build
A plan you can read, then senior engineers ship it in tight loops — working software every week.
- 03
Launch & scale
We take it live, harden and instrument it, and autoscale it to match real demand.
- 04
Stay on
We don't stop at launch. As your needs shift we adjust it on demand, handle what comes up, and help you take it further.
The studio
A senior team that takes on the hard problems.
3xb is a studio of senior engineers — 10+ years each, across venture-backed startups, enterprise systems and high-stakes production platforms.
We're modern, young and deliberately broad. The problems worth solving rarely sit neatly in one stack, so we don't either — we bring the right people to the right layer and ship.
Kraków, Poland · EU
- 10+ yrs
- Avg. experience
- Full-spectrum
- One team
Let's talk
Let's build something that scales.
Tell us what you're working on. We reply within one business day.