ATKAkram Trabelsi Karoui

Full-stack software engineerMobileBackendCloud

I build production software that has to work at scale.

Full-stack engineer specializing in Flutter, backend systems and cloud infrastructure. I've built real-time products used by 100k+ users and systems processing 10M+ transactions per year.

View selected work Download CV

Available for full-timefreelancetechnical partnerships

Portrait of Akram Trabelsi Karoui

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Build
Scalable
Reliable
Real-time

10K+concurrent users
<200mslatency
10M+transactions / year
100K+users in France
~80%requests dispatched without delay

02Video

See my work in action

What I can build for you, and how we can work together. The short version: the problems I solve, the results behind them, and the ways to work with me.

Skip to my work

03Selected work

Featured projects

Five products across fintech, autonomous mobility, EV charging, sports booking and high-volume transactions, plus three smaller builds.

Autonomous mobilityBackend & Cloud Engineer
SQY Flex
A fleet of autonomous shuttles (3 real, 2 simulated) needed a cloud-native platform for bookings, route optimisation and field operations.
~80%of ride requests accepted with no delay
Read the case study : SQY Flex
FintechTeam Lead
InnoSight Financial
A portfolio and asset management product needed real-time data at scale and bank-grade security.
10k+concurrent users at <200ms latency
Read the case study : InnoSight Financial
TransactionsSoftware Engineer
Paramedics
Client infrastructure needed a cross-platform mobile product and a faster backend for high transaction volume.
10M+transactions per year
Read the case study : Paramedics
EV chargingSenior Mobile Engineer
Borne4You
EV drivers needed live charger locations and charging status on both platforms.
10k+drivers with live charging data
Read the case study : Borne4You
Sports bookingLead Flutter Developer
MyMatch
Sports complexes needed one booking product they could brand as their own.
1,500+payments in the first quarter
Read the case study : MyMatch

Also built

Shipping & logistics
Treek
One dashboard where e-commerce merchants compare rates, book and track shipments across multiple courier companies. React frontend on a Laravel API, deployed with Laravel Forge behind Cloudflare.
Visit Treek (opens in a new tab)
Self-service laundry
Wash.ME
Flutter app for a network of 7,800+ connected self-service launderettes across Europe: find a launderette nearby, check machine availability, and follow a wash cycle live with a notification when it is done. 100k+ users. Also handled App Store Optimization.
100k+users
Visit Wash.ME (opens in a new tab)
Dance & arts academy
Dada Hip Hop Academy
Website for a Tunis academy teaching dance, gymnastics, martial arts and artistic creation, supported by EU4Youth and the European Union. Presents the dance clubs, the recording studio and the creative workshops, with a digital space for the community.
Visit Dada Hip Hop Academy (opens in a new tab)

04Experience

Professional journey

From developer to team lead in four years: the main roles, the freelance engagements alongside them, and education.

Main career

Mar 2025 – presentCurrent
Backend & Cloud Engineer
AI Mobility Solutions
Built SQY Flex, a cloud-native microservices platform for autonomous shuttles: route scheduling engine, Kafka messaging, live tracking, and Kubernetes deployment on OVH.
~80%of ride requests accepted with no delay
Read the SQY Flex case study
Jul 2024 – Feb 2026
Team Lead Engineer
InnoSight Financial · Remote (USA)
Led a cross-functional engineering team across architecture, security and release pipelines. Real-time layer serving 10k+ concurrent users at under 200ms.
10k+concurrent users at <200ms latency
Read the InnoSight Financial case study
Nov 2023 – Nov 2024
Software Engineer
MyPartner ISC · Sfax
Built the Flutter platform and NestJS backend behind 10M+ transactions per year. Backend computation 60% faster.
10M+transactions per year
Read the Paramedics case study
Apr 2022 – Oct 2023
Full-Stack Developer
Piximind · Sfax
Built Wash.ME, a self-service laundry app with 100k+ users in France. Mentored 7 final-year engineering interns, 5 of whom were hired full-time.
100k+users
Visit Wash.ME

Selected freelance engagements

Contracts taken on alongside the main roles, which is why the dates overlap.

Dec 2024 – Aug 2025Freelance contract
MyMatch
Lead Flutter Developer · Sfax
Oct 2024 – Feb 2025Freelance contract
Borne4You
Senior Mobile Engineer · Remote (France)

Education & certifications

EducationEngineering degree, Computer EngineeringNational Engineering School of Sfax · CTI-accredited · 2019–2022
EducationPreparatory cyclePreparatory Institute for Engineering Studies of Sfax · 2017–2019
CertificationProfessional ScrumScrum.org · 2022
CertificationRust ProgrammingKodeKloud · 2025
CertificationDockerKodeKloud · 2022
CertificationCommunication & Interpersonal SkillsPMI · 2022

05How I work

How I work, and the tools I do it with.

Five practices I bring to every team, and the stack grouped by what each tool is for.

Practices

01
Architecture first
Specs and documentation before code, so stakeholders and engineers align early.
02
Automated delivery
CI/CD from day one, so releases are fast, repeatable and low-risk.
03
Quality gates
Code review, SonarQube and automated tests (Playwright, Vitest), so issues surface before users see them.
04
Security by default
SSO, OWASP Top 10 and schema validation, especially in fintech.
05
Growing people
Mentoring and clear reviews, so the team gets stronger, not just the codebase.

Tech stack

Mobile

One Flutter codebase for iOS and Android, with native access where it matters.

Flutter
Dart
BLoC / Provider
Firebase
Android SDK
iOS
Multi-flavor builds

Web

Dashboards, admin tools and customer-facing web apps on the same APIs as the mobile apps.

React
Angular
TypeScript
Vite

Backend

Typed, structured frameworks matched to the team and the domain, real-time where the product needs it.

Spring Boot / Spring Cloud
NestJS
Laravel / Symfony
Django
FastAPI
Kafka
WebSockets

Databases

Relational databases for the core data, Redis where speed matters.

PostgreSQL
MySQL
Redis

DevOps & cloud

Every merge is built, tested and ready to ship.

Docker
Kubernetes
GitHub Actions
GitLab CI/CD
Codemagic
Fastlane
Nginx
Azure
AWS
OVH
Cloudflare

Quality & security

Standards enforced by tooling, not memory.

Clean Architecture
SonarQube
Playwright
Vitest
Zod
Keycloak SSO
JWT
OWASP Top 10

Languages

Picked for the job: typed where it counts, scripting where it saves time.

Dart
TypeScript
JavaScript
Java
Python
Rust

Need this stack on your product?

A few lines about your product are enough. You'll get a reply within 24 hours on how I'd approach it.

Tell me what you're building

06Work with me

Let's build something great

Full-time (remote or relocating), freelance, a team I lead, or a startup to build together.

Full-time
Hiring for a full-time role?
Remote from Sfax, or relocating for the right team. Fluent in English and French, and used to working across time zones.
Best forProduct companies hiring a full-stack, mobile or backend engineer.
Work mode
Remote, or relocation worldwide
Current role
Backend & Cloud Engineer, AI Mobility Solutions
Notice period
3 months
Work authorisation
Visa sponsorship needed to relocate
Discuss a role Download CV
Freelance
Need a senior engineer on your product?
Remote contracts, full-time or part-time: a few days a week, or all of them. Mobile, web and backend, from architecture to store release.
Best forTeams and founders who need an extra senior engineer on a product.
1. 01Discovery · Your users, goals and constraints, in one short call.
2. 02Planning · Architecture, scope and milestones agreed in writing.
3. 03Development · Short iterations with working builds you can test.
4. 04Review · Code review, tests and security checks before each release.
5. 05Delivery · Store release, handover docs and a clean repository.
Let's talk about your project
Team
Need a whole team, not one engineer?
I put together and lead the team your product needs, the way I led a cross-functional team at InnoSight. You deal with one person: me.
Best forCompanies that need a product built and delivered, not just staffed.
1. 01Sized to the scope · Mobile, web, backend and DevOps, only the roles you need.
2. 02Led end to end · I own architecture, code review and delivery.
3. 03Visible progress · Regular demos and written updates, no black box.
Plan a team
Startups & partnerships
Building something new?
Open to early-stage startups, ideas backed by investors, and collaborations with other builders.
Best forFounders at the idea or MVP stage, investors, and other builders.
1. 01Technical partner · Owning the product and the tech from day one.
2. 02Investor-ready MVP · A working product to show, built to keep growing after the round.
3. 03Collaborations · Joint projects with agencies, studios and other freelancers.
Pitch me your idea

07Contact

Have a product to build?Have a team that needs engineering expertise?Let's talk.

Start a conversation

Sfax is on UTC+1; replies within 24 hours.

Or reach me directly

Based in Sfax, Tunisia · Available remotely

Get in touch

Tell me about the role or the project. I reply within 24 hours.

Available for roles & projectsSfax (UTC+1) · Replies within 24 hours