Rejeb Dendir Bireda
Contact
Available for work

RejebDendirBireda

Full-Stack Engineer

  • SaaS & ERP Architect
  • Web
  • Mobile
  • and Desktop Apps
  • Automation and AI Integration

I build production software end to end: SaaS, ERP, web, mobile, and desktop systems designed to handle real users, real business workflows, and real-world failure.

Experience
5.2 yrs
Projects
10+
Rejeb Dendir Bireda
01About

I build the systems businesses actually run on.

I start by understanding the business workflow before deciding how to build it. I use Flutter with clean architecture for mobile, Next.js for web, Node.js/NestJS for backend services, and PostgreSQL, MySQL, Supabase, or Firebase where they fit the data layer. I also build cross-platform desktop apps for Windows and macOS. The stack is secondary to solving the workflow properly, keeping the system maintainable, and making it reliable when real users and real-world failures arrive.

  • Addis Ababa, Ethiopia
  • 5.2 years building software
02Services

What I take on.

End-to-end product work across mobile, web, backend, and business systems, from architecture through to release.

03Projects

Selected work.

These are systems I designed, built, and shipped, working products, not demos. Open a case study to see the problem on the ground, the architecture and stack behind the build, the tradeoffs I accepted, and what actually reached production.

  • Noodo Bakers cover

    Noodo Bakers

    Food Delivery App

    End-to-end food delivery platform for Noodo Bakers: Flutter customer app plus Node.js API covering menus, checkout, local payments, loyalty, and live delivery tracking over Socket.IO.

    Case study
  • Noodo Driver cover

    Noodo Driver

    Order Delivery App

    Driver app for Noodo Bakers deliveries: accept orders, navigate live, stream GPS in the background, and complete handoffs with QR verification, Flutter + Socket.IO on the shared delivery API.

    Case study
  • Nejat Garment cover

    Nejat Garment

    Garment Manufacturing ERP

    Cross-platform ERP for a garment factory, production, inventory, sales, payroll, and role-based access, one system on desktop and mobile.

    Case study
04Experience

Where I've done the work.

  1. Mar 2026 — Present

    9 mosCurrent

  2. Jul 2025 — Mar 2026

    9 mos

  3. Feb 2025 — Jul 2025

    6 mos

  4. Jun 2024 — Aug 2024

    3 mos
05Skills

The stack I work in.

Grouped by what it is for, not by how long the list looks.

  • Mobile

    Flutter and the mobile platform work around it.

    • Spring Securityflutter_secure_storage
    • Chapa
    • Telebirr
    • Gebeta Maps
    • flutter_map
    • Geolocator
    • GoRouter
    • Dio
    • Retrofit
    • Freezed
    • Auth0Firebase Auth
    • Firebase Cloud Messaging
    • Socket.IO
    • Flutter
    • Riverpod
    • Push Notifications
    • Deep Linking
    • Widget Performance Profiling

  • Languages

    Languages I write production code in.

    • Dart
    • TypeScript
    • JavaScript
    • Python
    • SQL

  • Backend and APIs

    Server-side logic, APIs, auth and real-time transport.

    • Express
    • AdminerFirebase Admin
    • AdGuardJoi
    • AdGuardJWT
    • MySQL
    • Node.js
    • REST APIs
    • WebSockets
    • Supabase
    • Authentication and JWT
    • Payment Integration

  • Databases

    Schema design, queries and performance.

    • PostgreSQL
    • Database Schema Design
    • Query Optimization

  • Web and Frontend

    The web stack I use for dashboards and admin tools.

    • Next.js
    • React
    • Tailwind CSS
    • Zustand

  • DevOps and Cloud

    Version control, CI and deployment.

    • Git
    • GitHub Actions
    • Cloud Deployment

  • AI and Machine Learning

    Applied machine learning from the Frontier Tech Leaders bootcamp.

    • Machine Learning

  • Engineering Practice

    How I structure systems, not just which tools I use.

    • Clean Architecture
    • Role-Based Access Control
    • Offline and Failure Handling
    • API Contract Design
06Writing

Notes from the work.

Practical engineering notes I publish on Medium, production problems I encounter, how I diagnose them, the tradeoffs behind each solution, and what I learn from shipping the fix.

Your Flutter App Will Lose Data Offline, and Last-Write-Wins Is Why

Syncing offline writes in the order they reach the server gives a different answer than the order they happened. In an inventory or POS system, that difference is missing stock and lost revenue. This walks through why timestamped deltas beat absolute values, and when a conflict has to be shown to a person instead of resolved in code.

  • Flutter
  • Offline First
  • Data Sync
9 minRead

Push Notifications in Flutter: the Terminated State Is Where It Breaks

Foreground notifications are easy, background is documented, and terminated is where most implementations quietly fail. It passes testing because nobody tests with the app killed, and it fails in production as a customer missing a delivery at their door. Includes cold-start deep linking, which has the same problem.

  • Flutter
  • Push Notifications
  • Deep Linking
8 minRead

Why I Enforce Permissions in Postgres, Not in My App Code

Application-level permission checks work for the first twenty queries and fail on the twenty-first, the one where someone forgot the condition. Row-level security is harder to write and cannot be forgotten. A practical walkthrough using Supabase, including the parts that are genuinely annoying.

  • PostgreSQL
  • Row Level Security
  • Supabase
7 minRead

Reconnection, Not Connection, Is the Hard Part of Real-Time Apps

Opening a socket and streaming updates is the tutorial. What happens when it drops is the product. If a client resumes from cached state instead of reconciling against the server, users sit on stale data believing it is live, which in a delivery app means a customer watching "preparing" for an order that already arrived.

  • WebSockets
  • Real Time
  • Flutter
8 minRead

Modelling an ERP: Store Events, Not Totals

Storing running totals is simpler to read and drifts the moment two writes race. Storing stage transitions as events costs more query work and is the reason your stock figures, order fulfilment and payroll can all be derived from one source instead of disagreeing with each other. From building a garment manufacturing ERP.

  • Database Design
  • ERP
  • PostgreSQL
10 minRead
07Community

Programmes and community work.

Beyond the codebase, I take part in leadership programmes, professional forums, and volunteer initiatives that strengthen how I communicate, collaborate, and contribute to the wider technology community.

08Education

Formal background.

  • St. Mary's University logo

    St. Mary's University

    Sep 2021 — Feb 2025

    B.Sc. Computer Science, Computer Science

    Addis Ababa, Ethiopia · Grade 3.96/4.0

    Four-year Computer Science degree covering the foundations I still use: data structures, computer architecture, object-oriented programming, and database systems. I served as class representative, which meant I was the person both sides came to when a problem needed resolving, and I took part in the department's ICT exhibitions.

  • Frontier Tech Leaders Programme (UNDP / UN Technology Bank) logo

    Frontier Tech Leaders Programme (UNDP / UN Technology Bank)

    Mar 2025 — May 2025

    Certificate in Machine Learning and AI, Machine Learning and Artificial Intelligence

    Addis Ababa, Ethiopia

    Project-based machine learning bootcamp run by UNDP ICPSD, the SDG AI Lab, the UN Technology Bank for Least Developed Countries, and Ethiopia's Ministry of Innovation. Project-based rather than lecture-based, which is the part that mattered: the work was building models against real data, not reproducing textbook examples.

  • Young African Leaders Initiative (YALI) Regional Leadership Center East Africa logo

    Young African Leaders Initiative (YALI) Regional Leadership Center East Africa

    Sep 2024 — Oct 2024

    Certificate in Leadership, Business and Entrepreneurship, Business, Administration and Law

    Mombasa, Kenya

    USAID-funded leadership development programme, Cohort 58. Focused on strategic leadership, entrepreneurship and public speaking. The practical result for my client work is straightforward: it is where I got better at scoping ambiguous problems with people who are not engineers, and at owning an outcome rather than a task list.

09Certifications

Verified training.

Certificates are viewable in full, with credential IDs where the issuer provides them.

Technical14

Leadership and Business4

Professional Effectiveness1

11Testimonials

From people who’ve seen the work.

Mr. Bireda was an outstanding participant and brought energy, enthusiasm and perspective during the program. With his extensive interest in Business and Entrepreneurship, he distinguished himself as a committed learner able to tap into opportunities to promote transformation in his country. I recommend him and will appreciate any support or assistance accorded to him.

Dr. George KosimbeiChief of Party, YALI Regional Leadership Center East Africa (USAID)

Though Rejeb had shown remarkable competence in the course works, the best example of his intellectual integrity was observed during a project work in which students were required to work in groups. His communication skills and leadership abilities in the group work and presentation of the project were outstanding. As much spirit of teamwork as he has, I have observed that he is also endowed with the abilities of working independently. He is now remembered as an intellectual that approaches problems with an inquisitive mind. I have found him to be dependable, responsible, dedicated, competent, industrious, and a leader of good quality.

BBerihun Getnet (MSc)Lecturer of Computer Science, St. Mary's University
12Contact

Tell me what you're building.

A short description of the problem and your timeline is enough to start.

Availability

Open to freelance and remote roles. I only take on work I can commit to properly.