Custom Software, Built by Engineers You Approve
We build and extend products for finance, healthcare, education, and insurance — from Hamburg, with teams in Ukraine, Poland, and Romania. You interview every engineer and see every repository from day one. A working team in 2–4 weeks.
Four Commitments You Can Check
Expensive software failures usually start before the first sprint: vague scope, anonymous staffing, quality assumptions nobody wrote down. So instead of a values list, here are working rules you can verify — in the contract, in the repository, or in the interviews you run yourself.
Contact UsYou approve the people
CVs first, then your own technical interview. Nobody joins your team without your sign-off — a rule, not a courtesy. If someone leaves or is out sick, the replacement goes through the same interview.
You inspect the process
Direct access to every repository, sprint board, and standup from week one. Nothing merges without code review and a green CI run. There is no client-facing version of the truth.
You own the code
100% of the source, documentation, and intellectual property is yours from the first line. It's a standard clause in every CQUELLE contract.
AI inside guardrails
Our developers use Claude and Cursor daily — under project rules, automated tests, and human review. That's where “up to 40% faster” comes from: boilerplate and test scaffolding accelerate, code review never gets skipped.
Business Fields
Four sectors we focus on — regulated, integration-heavy, or both. If yours isn't here, ask anyway; sometimes the honest answer is a referral.
EdTech
Assessment and learning platforms — including an eAssessment system used in international research studies in 60+ countries, with tens of thousands of test-takers per cycle.
Learn more
HealthTech
Patient and practice software, from veterinary practice management to healthcare data workflows. GDPR by default; HIPAA where your market requires it.
Learn more
Fintech
Banking, payments, and advisory platforms, where audit trails and compliance requirements shape the architecture before the first screen is designed.
Learn more
Insurtech
Policy, claims, and underwriting workflows. Most of the complexity lives in the business rules rather than the screens.
Learn more
What Our Clients Say
Rated 5.0 across every project by our clients.
“It's been a pleasure working with CQUELLE team. In an era where AI tools can do everything, it's hard to find people that can understand the business need and ask the right questions. A great profile for a startup where things are not perfectly square and a lot must be achieved.”
Jean-Christophe Vasselon
GoFlint
France — Product Development
“It was wonderful working with them; they were a great team.”
Founder & CEO
AI Optimization Platform
New York City — MVP Design & Development
“The ongoing collaboration with CQUELLE is a testament to their exceptional ability to consistently deliver robust, commercial-ready software solutions.”
CTO
Veterinary Practice Business Services
New York City — Web & Mobile App Development
“They were very responsive and reactive both in the planning and execution of the project.”
Managing Director
Financial Solutions Group
Atlanta, Georgia — Custom Software Development
“CQUELLE has been a game-changer for our business operations.”
Co-Founder & Managing Partner
Healthcare Investment Firm
San Francisco — AI & Software Development for Healthcare
“They demonstrated a remarkable ability to deliver items on time consistently.”
Campaign Management Specialist
Software Engineering Company
Poland — Campaign Management System
Our Team
The people below are the ones who will actually be on your calls, with their real roles and locations.
Ievgen
Software Development & Management
Hamburg, Germany
Roman
.NET & Angular Developer
Lviv, Ukraine
Oleh
.NET, Angular & React Developer
Warsaw, Poland
Mark
.NET & React Developer
Bucharest, Romania
Vladyslav
Full Stack Developer
Kharkiv, Ukraine
Your Dedicated Team
Assembled per project — you interview each member
Ukraine, Poland & Romania
Service & Expertise
Full-Stack Software Development
.NET and Python on the backend, React and Next.js on the frontend, and the cloud infrastructure in between — one team owning a feature from database to browser.
Solution Design
The work before the code: architecture, integration boundaries, and build-vs-buy decisions. We ask the questions a CTO would ask, then write the answers down where your team can find them.
Product Development
Concept to production with a roadmap you can hold us to. The definition of done includes tests, documentation, and a handover your own engineers could take over.
How We Work
From first call to a team shipping code in 2–4 weeks. Here is what actually happens.
- 01Week 1
Discovery & Scoping
A technical discovery session on your product and architecture. The week ends with a concrete proposal: roles, seniority levels, and a projected timeline.
- 02Weeks 2–3
Team Assembly & Vetting
Technical screening and code-review exercises on our side; you interview the candidates yourself. Nobody joins the team without your sign-off.
- 03Weeks 3–4
Onboarding & Integration
The team gets access to your repositories and studies the codebase, working in the tools you already use: Jira, Azure DevOps, Linear. First code ships in week 4.
- 04Ongoing
Sprints & Scaling
Daily standups and a sprint cadence on your schedule. Add people within 1–2 weeks; scale down with 30 days' notice. The code and IP are 100% yours from the first line.
Tech Stack We Work With
AI & LLM
.NET
React
Angular
Python
Next.js
PostgreSQL
Boutique on Purpose
CQUELLE was founded in Hamburg in 2019 and has stayed deliberately small since. Ievgen has been writing code since 2005 — Langate, DataArt, IEA Hamburg — so the person quoting your project can also read its pull requests. The team stays senior, and the projects stay ones we'd put our names on.
Frequently Asked Questions
What does CQUELLE do?
Where is CQUELLE based, and what time zones do you work in?
What technologies does CQUELLE specialize in?
How do I engage CQUELLE — a dedicated team or a fixed project?
Do I own the source code and intellectual property CQUELLE builds?
Which industries does CQUELLE serve, and how do you handle compliance?
What You Leave the First Call With
An engagement model
Build, extend, or rescue; dedicated team or fixed scope. Matched to your situation, with reasons.
The first risk to remove
The one thing in your current setup most likely to sink the project, named out loud.
A straight answer
If we're not the right vendor for this, you'll hear it on the call, along with what to look for instead.
30 minutes, with Ievgen. Send your preferred days and times; we confirm by email.
Turning Visions
into Milestones
Have a question? You're just a step away — send us a message, and our team will respond swiftly.
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.