Certificated AI Full-Stack Engineer | 8+ Years Experience

Great to see you here! This is Denys.

As a senior full stack engineer with 8+ years of hands-on experience, I deliver robust, scalable, and high-performance web and mobile solutions that power both startups and established enterprises. My core expertise lies in architechering and building cross-platform applications using modern JavaScript/TypeScript frameworks—including React, Next.js, React Native, and Node.js—backed by cloud-native platforms like AWS, Supabase, and Firebase.

👉 What I Offer
• End-to-End Product Engineering: From whiteboard to production, I manage every phase—design, development, deployment, and maintenance—ensuring a seamless handoff and long-term scalability.
• Unified Codebases: Expert at leveraging monorepos and modern architectures to maximize code reuse, reduce bugs, and speed up multi-platform feature delivery.
• AI-Driven Features: Integrate AI/ML APIs and build smart interfaces, chatbots, and recommendation systems using the latest AI tools.
• API Integrations: Deep experience integrating with payment (Stripe), messaging (Twilio), authentication (OAuth, JWT), and third-party SaaS APIs.
• Cloud & DevOps: Skilled in serverless deployments (Vercel, AWS Lambda, Firebase), CI/CD pipelines, and cost-optimized infrastructure design for smooth scaling.
• Performance & Security: Proactive about optimizing load times, memory usage, and securing applications against modern threats.
• Collaborative Delivery: I thrive in agile teams, working closely with designers, PMs, and QA to ship features rapidly and iteratively.

👉 Achievements
• Led the complete rebuild of a SaaS analytics dashboard serving 50,000+ active users—cutting page load times by 40% and boosting engagement.
• Developed a unified onboarding flow that adapts seamlessly across web and mobile clients, improving user retention by 18%.
• Architected and maintained a monorepo powering both web and mobile apps, streamlining feature rollouts and reducing technical debt.
• Integrated payment (Stripe) and communication (Twilio) solutions for multi-tenant marketplaces and subscription platforms.

👉 Technologies & Tools
• Frontend: React, Next.js, React Native, Ionic, Redux, Tailwind CSS, Material UI
• Backend: Node.js, Express, Supabase, Firebase, AWS Lambda, REST, GraphQL
• API Development : JSON, Restful API, XML, SOAP GraphQL
• DevOps/Infra: AWS, Vercel, Docker, CI/CD, GitHub Actions
• Integrations: Stripe, Twilio, Auth0, OpenAI, third-party SaaS APIs
• Testing: Jest, Cypress, Detox

If you need a partner who can architect, build, and scale products with clarity and speed—while always keeping user experience front and center—let’s connect. I’m ready to help you launch, optimize, or transform your next big idea.

Work Terms

Availability: I am available full-time (40 hours per week).
Communication: I prefer communicating via Guru’s messaging system, Slack, or Telegram.
Payment Terms: I require weekly or bi-weekly payments for all projects.
Revisions: I offer 5 free revisions to ensure your satisfaction; additional revisions may incur extra charges.
Turnaround Time: Project timelines are based on the project scope and client responsiveness.

I am committed to delivering high-quality work and maintaining transparent communication throughout our collaboration.