Fullstack Product Delivery
Design and build end-to-end JavaScript solutions with React, Node.js, Express and MongoDB or PostgreSQL.
Hello, I'm Mahamadi Congo
Secure-first Fullstack Engineering
React, Node.js and cloud-native workflows to ship fast, scalable and secure digital experiences.
From TA Europe to Zalando and Hoppipolla, I've delivered production-grade apps, mentoring teams on performance, accessibility and secure coding. I currently upskill in cybersecurity to bridge the gap between product velocity and security posture.
- Location
- Berlin · Germany
- Availability
- Available for freelance contracts and full-time opportunities.
Fullstack Engineering
Build. Ship. Secure.
I combine secure-by-design engineering with hands-on threat response. Choose the track you'd like to explore.
Production launches15+
Years in JS ecosystem5+
Secure coding workshops8
Available for freelance missions, part-time consulting, or Berlin-based full-time roles focused on secure web applications.
API Architecture & Integrations
Design RESTful or GraphQL services, document standards, and ensure robust authentication and observability.
Secure Frontend Systems
Implement component libraries, design systems and CI pipelines with static analysis and secure coding guardrails.
Cloud & DevOps Enablement
Containerize applications, set up CI/CD, and deploy on AWS with focus on cost, resilience and security.
Cross-domain expertise that scales with your ambitions
Pairing fullstack engineering discipline with cybersecurity rigour to ship features faster — without sacrificing resilience.
15+
Production launches
5+
Years in JS ecosystem
8
Secure coding workshops
Signature projects
Explore a curated selection of work that illustrates my approach to product engineering.
1.9 yearsTA Europe · Infrastructure Advisory Suite
Led the modernization of internal dashboards with React, Redux, and Node.js APIs. Reduced loading time by 47% and introduced reusable secure components.
4 month internshipZalando SE · Experimentation Platform
Collaborated on a large-scale experimentation platform, contributing UI modules and refining delivery processes across squads.
20+ reposPortfolio & Open Source
20+ repositories featuring React, Next.js, and Node.js solutions. Highlights include design systems, dashboard templates and security-focused utilities.
Testimonials & impact
Available for freelance missions, part-time consulting, or Berlin-based full-time roles focused on secure web applications.
- Available for freelance contracts and full-time opportunities.
- Mahamadi Congo · Berlin
“Collaborating with Mahamadi in our tech department at TA Europe was an absolute pleasure. He transformed intricate designs into intuitive, user-centric interfaces and his deep React expertise accelerated our delivery. Beyond the code, his knowledge sharing and positive attitude strengthened the team — I endorse him wholeheartedly for any front-end role.”
“Mahamadi has always been a positive addition to our team — enthusiastic, a smart problem-solver, and a highly motivated front-end engineer. At Staiy he built UI components from scratch, debugged authentication flows, and improved backend API endpoints, all successfully. If you are looking to hire him, do not miss out.”
Have an ambitious project in mind?
Let's architect a secure and elegant solution together.