I build reliable, scalable backends that power real businesses in Tanzania.
Backend Engineer · API Specialist · M-Pesa & Payment Integrations
Helping Tanzanian startups and SMEs ship faster and safer.
I help Tanzanian businesses stop losing revenue to unstable payment systems and crashing servers. Specializing in production-grade M-Pesa and Mobile Money integrations, I build the 'invisible infrastructure' that ensures...
Services I Offer
Everything you need to build, scale, and maintain a solid backend — built for the Tanzanian market.
Mobile Money & Payment Integrations
Pain
Failed payments are costing you money and customer trust.
Solution
Stop losing 5-10% of revenue to failed M-Pesa transactions or confused customers. I build payment systems so reliable that you sleep at night knowing every shilling gets logged, reconciled, and reaches your account.
Custom Backend Development
Pain
Your backend is slowing growth and creating avoidable problems.
Solution
I build robust backends from scratch or improve existing ones using modern technologies. What’s included: RESTful & GraphQL APIs Database design & optimization (PostgreSQL, MongoDB, MySQL) Authentication & Authorization systems Scalable architecture for growing user bases Clean, well-documented code Best for: Startups building MVPs, e-commerce platforms, fintech apps, inventory systems.
Backend Security Audits
Pain
You're worried a security hole could expose customer data.
Solution
You just realized your database has 50,000 customer phone numbers stored in plain text. You're terrified of being hacked or losing sensitive data. I find every hole in your system and give you a clear plan to fix them before someone exploits them.
Recent Work
Real solutions built for real businesses — focused on scalability, security, and maintainability.
Scalable E-commerce Backend
Built a complete backend system handling product catalog, user authentication, order management, and real-time inventory. Integrated M-Pesa and Tigo Pesa for seamless payments. The system cu...
Fintech Payment Gateway Integration
Developed a secure backend connecting multiple mobile money providers with a lending platform. Implemented webhook handling, transaction reconciliation, and fraud detection logic to protect...
Inventory Management System Backend
Built a robust backend for a growing retail chain with multi-user access control, real-time stock updates via WebSockets, supplier management, and a reporting dashboard API.
Why Choose Me?
Not just a developer — a partner who understands your business context.
Deep Local Knowledge
I understand Tanzanian business challenges firsthand — mobile money quirks, unreliable infrastructure, and cost-effective scaling.
Clean, Documented Code
Every project I deliver is well-documented, maintainable, and easy for your team to understand and extend.
Honest Communication
Realistic timelines, transparent pricing, and no hidden surprises. If something won't work, I'll tell you upfront.
Passion for Teaching
I create tutorials and resources for other developers. Working with me means you learn — not just receive code.
What Clients Say
Real feedback from businesses I've worked with.
"Denis fixed our payment integration in 3 days. Our failed transaction rate dropped from 12% to 2%. That's real money."
Jane M.
E-commerce Founder, Dar es Salaam
"Our API was slow and crashed under load. Denis rewrote it, and now it handles 10x the traffic. His documentation is insanely clear."
Ahmed K.
Fintech Startup, Arusha
Latest Articles
Technical guides and insights focused on backend development in the Tanzanian context.
Why Most Tanzanian Startups Fail at Backend Development – And How to Avoid It in 2026
Common backend mistakes, wrong tech choices, and a practical pre-launch checklist for Tanzanian startup founders and developers.
May 2026
ArticleBuilding Secure User Authentication with Next.js & Supabase (Beginner to Intermediate)
From zero to production-ready auth: email verification, role-based access, JWT, refresh tokens, and the security mistakes most tutorials skip
May 2026
ArticleHow I Built a Production-Ready M-Pesa Integration Backend in Node.js
A step-by-step guide covering webhook handling, security, reconciliation, and common mistakes to avoid when integrating M-Pesa in Tanzania.
May 2026
Ready to build something solid?
Let's talk about your backend needs. The first conversation is always free and pressure-free.