Fullstack software engineer Maciej Jaros, building mobile, web and desktop applications for clients across Silesia (Katowice, Gliwice, Zabrze, Chorzów) and globally. Stack: Next.js, React Native, Flutter, TypeScript, AI integration, cybersecurity.

Online · from idea to launch

Ideas don't build wealth.Products do.I'll build you a product people will pay for.

  • 1-on-1 partnership

    You talk directly to the person building your software. No middlemen, no time lost re-explaining the same vision.

  • You invest in outcomes, not in presence

    I don't sell time spent at the screen. You invest in a working solution that actually grows your business.

  • Full ownership

    I run the process end to end and take responsibility for the result. I stand behind my solution with a guarantee, and if I don't deliver the agreed outcome, you get your money back.

Maciej Jaros, fullstack software engineer building business software in Next.js, Flutter and React Native. Based in Katowice, Poland.

Engagement process

From first contact to the first line of code.

  1. Free consultation

    We set up a short call. You walk me through the goal or the problem, and on the spot I honestly assess its feasibility and outline the direction I'd take.

    What you get: In 20 minutes you walk away with a seasoned engineer's take on your idea: whether it holds up and how best to build it. Free, no risk, and if it's not my area, I'll tell you plainly.

  2. Clear estimate and timeline

    If I see I can help, I come back with specifics: a clear estimate and a realistic timeline. You know what the investment costs and when you'll see the first working results, before you sign anything.

    What you get: Full predictability. You plan the budget on hard numbers, not rough guesses, and decide with the full picture, no surprises down the road.

  3. Engagement terms

    You pick the model that fits the project and budget: pay per fixed scope or an ongoing monthly retainer. The B2B contract is simple and concrete, terms set plainly, with no corporate overhead or legal back-and-forth.

    What you get: Instead of getting stuck in paperwork, we move quickly to what you came for: building the product.

  4. Kickoff

    You make the call based on the facts, with no pressure. When you say yes, I don't wait around: on the agreed date I get to work bringing your vision to life. I back my solution with a guarantee, so you start with no risk.

    What you get: From decision to the first line of code in days, not weeks. Real motion instead of more meetings.

Your idea deserves professional execution. Book a call and turn it into reality.

Work

Selected projects.

Products I took from idea to launch.

Solo, from design to launch
Hospitality / POS2026

Cigar Lounge OS

One system that runs the whole cigar lounge: a niche Toast, Square and Lightspeed overlook. The POS works offline too, alongside an owner back-office, a guest app, a marketplace, events and loyalty. An in-house product sold to lounge owners.

FlutterDartDrift (SQLite)SupabasePostgreSQL + PostGIS+3
Whole lounge, 1 system
POS, back-office, guest app and marketplace, for the niche big POS players skip
Tobacco tax + age
Excise tax & age-verification audit top POS systems don't advertise
Humidor audit trail
Immutable inventory log, every change leaves a trace
Solo, from design to launch
EdTech / GovTech2026

Online exams and automated certification

End-to-end web platform for running competency exams and issuing officially recognized qualifications. Four roles, automated numbered PDF certificates, and exams that survive a dropped connection with a server-side timer that can't be gamed.

Flutter WebDartSupabasePostgreSQLClean Architecture+3
4
Roles, each with its own panel
Intake → certificate
The whole exam lifecycle in one system
Zero data loss
Exam survives a dropped connection
Co-creator, web / mobile / backend
IoT + SaaS2026

Smart Room Display

An in-house product for offices and coworking spaces: meeting-room booking with elegant e-ink signage by every door. The experience of the market leaders at a fraction of the rollout cost. Ready for deployments and available to order.

FlutterDartSupabasePostgreSQL (RLS)E-ink display+1
Lower cost per room
The market leaders' experience without their deployment cost
Live status
Real-time room availability
Zero upkeep
Managed centrally from the dashboard, no on-site service visits

Got an idea or a problem to solve? Let's talk.

Expertise

Not for everything. For this.

Six areas of expertise, from MVP to production-grade products. I focus where I actually ship stable outcomes.

Flutter
Dart
Swift
Kotlin
iOS
Android
Next.js
React
TypeScript
Node.js
Tailwind
Firebase
Supabase
Postgres
Stripe
Vercel
Figma
Flutter
Dart
Swift
Kotlin
iOS
Android
Next.js
React
TypeScript
Node.js
Tailwind
Firebase
Supabase
Postgres
Stripe
Vercel
Figma
Flutter
Dart
Swift
Kotlin
iOS
Android
Next.js
React
TypeScript
Node.js
Tailwind
Firebase
Supabase
Postgres
Stripe
Vercel
Figma
Flutter
Dart
Swift
Kotlin
iOS
Android
Next.js
React
TypeScript
Node.js
Tailwind
Firebase
Supabase
Postgres
Stripe
Vercel
Figma

FAQ

Common questions before kickoff.

If your question isn't here, let's cover it on a call. You'll get the answer in writing afterward.

Contact

Let's talk about your project.

Tell me what you're building, I'll reply with concrete notes and the date I can start.

Engagement type

Typical reply: within one business day.