Mehmet TUNÇTÜRK
CEO - Humat Enerji A.Ş
Hardworking, honest, does his job on time and delivers it. I am very lucky to be working with him. thank you Topoika - I've worked with Mehmet for a l...
Show moreHello
I'm Topoika David a
Full-Stack Developer
I build high-performance mobile and web applications that turn ideas into scalable, real-world products . Specialized in Flutter, modern web technologies, and clean system architecture . With modern stacks like Flutter, Node.js, Next.js, and Firebase, I deliver seamless user experiences across platforms.
Full-Stack Developer
Mobile App Developer
Flutter Mobile Apps
20+ Projects
Web Apps
15+ Projects
Backend APIs
12+ Projects
Cloud Services
10+ Projects
0+
Years Of
Experience
Helping startups and businesses turn ideas into scalable, production-ready applications with modern, high-performance technologies.
0+
Projects Completed
0+
Clients Reviews
0+
Published Projects
800+
WakaTime Hours
Mobile Development
Flutter & Dart
100%
API Integration
100%
Third-Party SDKs & Services
95%
App Store Deployment (iOS)
95%
Play Store Deployment (Android)
95%
UI Integration & Optimization
90%
Backend Development
Node.js
100%
RESTful APIs
100%
Express.js
95%
GraphQL APIs
90%
Databases (MySQL, PostgreSQL)
90%
Cloud Deployment (AWS, VPS, etc.)
90%
Services
What I Can Do For You
Flutter Mobile App Development
Flutter, Dart, Firebase, REST APIs
Design and develop high-quality cross-platform mobile applications for iOS and Android using Flutter. I focus on clean architecture, scalable codebases, smooth UI/UX, and full production readiness including authentication, real-time features, payments, and long-term maintainability.
Backend Systems & API Development
Node.js, TypeScript, Express, REST, GraphQL
Build secure, scalable backend systems that power real products. This includes designing robust APIs, implementing authentication and role management, handling business logic, integrating databases, and ensuring systems are optimized for performance, reliability, and future growth.
API & Third-Party Integrations
REST, Webhooks, Payments, Maps, Analytics
Seamless integration of third-party services such as payment gateways, messaging platforms, maps, analytics, and cloud services. I ensure stable data flow, proper error handling, secure communication, and smooth interoperability between systems.
Performance Optimization & Scaling
Caching, Query Optimization, PM2, Cloud Monitoring
Optimize applications for speed, stability, and scalability. This includes improving API response times, optimizing database queries, implementing caching strategies, reducing app load times, and preparing systems to handle real-world production traffic.
Web Applications & Dashboards
Next.js, React, TypeScript, Tailwind CSS
Develop modern, responsive web applications, landing pages, and admin dashboards. Focused on performance, SEO, clean UI, and scalable front-end architecture suitable for SaaS platforms, internal systems, and public-facing products.
AI & Smart Feature Integration
OpenAI APIs, Automation, Intelligent Systems
Integrate AI capabilities into products, including chat assistants, smart automation, content processing, and intelligent workflows. I help businesses enhance their platforms with modern AI-powered features that improve efficiency and user engagement.
Experience
Where I've Worked
Invest Africa
Mobile App Developer • Nov 2025 - July 2025
Jambo Pay (Vesen Computing)
Mobile App Developer • May 2024 - Nov 2024
Mast Digital Solutions
Mobile App Developer • Apr 2023 - Apr 2024
Humat Enerji A.Ş.
Web Developer • Mar 2020 - Oct 2020
Fiverr & Upwork (Freelance)
Full-Stack Developer • Apr 2020 - Present
Mobile App Developer @ Invest Africa
•Collaborated with a dynamic team to develop the Invest Africa mobile application using Flutter, focusing on delivering a seamless user experience for investment opportunities across Africa.
•Implemented robust features such as real-time market data integration, user authentication, and portfolio management to enhance user engagement and satisfaction.
•Worked closely with backend developers to ensure efficient API integration, enabling smooth data flow and real-time updates within the app.
•Utilized BLoC for state management, ensuring a responsive and consistent user interface across various devices and screen sizes.
•Maintained high code quality through regular code reviews, testing, and adherence to best practices in mobile app development.
Technologies:
FlutterDartBLoCFirebaseREST APIGitGitHubAgileScrumFigma
Certificates
Certifications & Achievements
Latest Portfolio
Some of My Recent Works
Auto Cllan for Auto Cllan
Auto Cllan simplifies buying, selling, and servicing cars and bikes by connecting users, shop owners, and workshops in one seamless platform. I led th...
MyChurch App for Bitwise Solutions
MyChurch is a Flutter mobile application designed to help churches manage activities and keep members connected. It supports events, announcements, us...
TheCatfish for Bitwise Solutions
TheCatfish is a social-style mobile application that helps users search and report online scammers. The platform supports posting scam reports, engage...
Acces Global for Mijini Tech
Access Global is a multi-vendor marketplace mobile application designed for the Congolese market. The app combines e-commerce and job marketplace func...
OutApp for Fiverr Client
OutApp is a Flutter-based mobile application built to help users discover, explore, and manage events from their phones. The goal was to create a clea...
BigMarv for BigMarv ~ William T.
BigMarv is a custom WordPress website built to showcase a personal brand and media presence. The project focused on accurately implementing the client...
My Timetable for Daystar Uni (Student Project)
My Timetable is a student-built system designed to help students convert complex and poorly formatted Excel exam timetables into clean, personalized, ...
My Portfolio for Personal Project
A personal portfolio website built to showcase selected projects, services, and technical experience in a clean, high-performance format. The site is ...
Testimonials
What My Clients Say About Me
Puneet Dhupar
Forex Trader
Topoika David is a great person to work with. He understood this complex assignment and went above and beyond his work to make sure that this app has ...
Show moreIman Ilyas
Data Analyst
It is great working with Topoika, not only very responsible but also always available to work, the communication is also remarkable there for a meet w...
Show moreKomba J.
Director - Bitwise Limited
I worked with David on two company products, MyChurch and TheCatfish, with outstanding results. His work was professional and well executed, and I rec...
Show moreWilliam T.
CEO ValidGoals
I have worked with Topoika on several projects. He first developed my website and helped me develop some of my client's sites, as well. I like that he...
Show moreAdekun Leman
CEO at Leman Global
David is indeed a professional who understands his work well, and he's exceptional at getting the job done. I will use this guy over and over again, a...
Show moreHessel Ortiz
Founder at Geo52
Very professional always attention to details. Happy with the work received
Patric
Founder GHListing
Great job Buddy good communication. understand the task at hand. delivery on time. thank you 🙏
My Process
A clear workflow from first message to production launch
Step 01
Contact Me
Reach out with your idea, business need, or problem you want to solve. You don’t need technical knowledge at this stage — just share what you want to build, your goals, and any examples you may have. The deliverable at this stage is a clear understanding of your vision and expectations.
Step 02
Free Quick Consultation
We schedule a short, free consultation to discuss your idea in detail. We talk about your target users, desired features, timeline, and budget range. The deliverable is a clearer product direction and initial recommendations on the best technical and product approach.
Step 03
Requirements & Plan
I analyze your idea and convert it into structured requirements. This includes defining core features, system behavior, technical needs, and project milestones. Deliverables include a feature list, technical outline, and a step-by-step execution roadmap.
Step 04
Proposal & Kickoff
You receive a detailed proposal covering scope, deliverables, cost, timeline, and communication structure. Once approved, we finalize agreements, set milestones, and officially kick off the project with a clear development plan.
Step 05
UI/UX & Structure
We align on how your product should look and feel. This may include wireframes, design references, or clickable prototypes. I also set up the technical foundation and architecture. Deliverables include design direction, system structure, and a ready-to-build project setup.
Step 06
Development Sprint
The product is built in structured development cycles. Features are implemented step-by-step, with regular progress updates, demos, and review points. Deliverables include working features, test builds, and continuous improvements based on feedback.
Step 07
Testing & QA
I thoroughly test the application for bugs, performance, security, and usability. Issues are fixed, workflows refined, and stability ensured. Deliverables include a production-ready system, tested features, and quality assurance checks.
Step 08
Deployment & Launch
Your product is prepared for real-world use. This includes server setup, database configuration, hosting, and publishing to web platforms or app stores. Deliverables include a live system, deployment documentation, and launch support.
Step 09
Support & Improvements
After launch, I provide support, maintenance, and feature improvements. This can include monitoring, updates, new functionality, and performance optimization. Deliverables include ongoing system support, updates, and long-term scalability planning.
Get In Touch
Let's Work Together
I'm currently open to new opportunities and collaborations. Whether you have a project in mind or just want to say hello, feel free to reach out!