Kossi Edem Dotsey
Senior Mobile & Backend Developer with 6+ years of experience. Expert in Flutter, Node.js, Clean Architecture, and DevOps. Open to remote or on-site opportunities.
Who am I?
About
I'm Edem DOTSEY, a Senior Mobile & Backend Developer based in Lomé, Togo, with 6+ years of experience delivering scalable production applications. As Tech Lead at HOTSHI Ltd in Ireland, I drove end-to-end mobile development — from Clean Architecture to team mentoring. Passionate about code quality and product impact.
Languages
Interests
Technical Adaptability
Comfortable with multiple tech stacks and able to quickly adapt to any technical environment.
Technical Leadership
Team mentoring, code reviews, and architectural decision-making; experience as Tech Lead and acting CTO.
Product Vision
User- and business-value oriented, capable of transforming an idea into a functional application.
Full-Stack Versatility
Skilled in developing end-to-end mobile, web, and backend applications with database integration.
My technical expertise
Skills
Mobile Development
Backend & API
Databases
DevOps & Infrastructure
Web Frontend
Tools & Others
My professional journey
Experience
Professional
Senior Flutter Developer & Tech Lead
- Led the development of cross-platform mobile applications (iOS & Android) at Hotshi using Flutter.
- Designed and implemented architectural standards (Clean Architecture) within the mobile team.
- Conducted code reviews, provided mentorship, and guided developers on best engineering practices.
- Contributed to technology decisions, technical recruitment, and product roadmap planning.
- Collaborated closely with product, design, and business teams to align technical solutions with business objectives.
Impact
- Significantly improved code maintainability and release stability
- Successfully launched the first production version of the application
- Increased team velocity and overall product quality
Mobile Developer (Flutter/Dart) & DevOps
- Developed and maintained multiple production mobile applications with advanced features such as payments, real-time interactions, geolocation, and push notifications.
- Designed scalable mobile and backend architectures tailored to business requirements.
- Implemented CI/CD pipelines using GitHub Actions.
- Deployed and managed production environments on Linux VPS servers, using containerized services (Docker).
Impact
- Reduced deployment errors through automation
- Improved system reliability, security, and availability
Full-Stack Web Developer
- Developed a WhatsApp marketing web application.
- Implemented a secure authentication system.
- Integrated the WhatsApp Business API (360Dialog).
- Managed personalized campaigns and messaging using WhatsApp templates.
- Developed a live chat system for company-to-client interactions.
- Built an import and management system for a contact database of over 800,000 entries.
Freelance
Katimini
Senior Mobile Developer & DevOps
- Developed Katimini, an interactive couples game enhancing engagement through personalized experiences.
- Integrated subscription payments via Google Play Billing and Mobile Money in 7 African countries.
- Built backend with Node.js/Express/MongoDB; deployed via Docker, NGINX, Portainer, and CI/CD (GitHub Actions).
Lazone
Full-Stack Mobile Developer & DevOps
- Developed a mobile cinema app with live streaming and audience interaction.
- Supporting ticket payments via 5+ Mobile Money solutions.
- Enabled scheduled and live viewing with broadcast calendar.
- Node.js/MongoDB backend deployed on Linux VPS with Docker, NGINX/Cloudflare, CI/CD, and Ant Media Server.
Production achievements
Projects
HOTSHI App
Full tech-led cross-platform mobile application.
Katimini
Interactive couples game enhancing relationships through personalized experiences.
Lazone
Online cinema and live streaming app with ticket purchasing and audience interaction.
e-Convivial WhatsApp Marketing
WhatsApp marketing platform with 800,000+ contacts and personalized campaigns.
My academic background
Education & Certifications
Education
Bachelor's Degree in Software Engineering
2019–2020Higher Technical Diploma (BTS) in Computer Management
2017–2019Baccalauréat (High School Diploma)
2015–2017Let's work together
Contact
Let's work together
Available for freelance missions, job opportunities or collaborations. Don't hesitate to reach out!
Availability
Remote / On-site