Денис

Denys Yakovenko
Full Stack Developer
[open contact info](look above in the "contact info" section)
[open contact info](look above in the "contact info" section)
LinkedIn
@den387

PROFESSIONAL SUMMARY

Results-oriented Software Engineer with 3+ years of experience building scalable web and mobile applications and robust
serverless infrastructure. Specialized in the TypeScript ecosystem (Next.js, Node.js, NestJS) with hands-on experience in React
Native mobile development, AWS cloud architecture, and CI/CD automation. Proven track record of reducing operational costs by
developing custom integration engines and optimizing rendering performance. Comfortable owning features end-to-end, from
UI/UX implementation to backend architecture and deployment.
TECHNICAL SKILLS

• Frontend: React, Next.js (App Router), TypeScript, Tailwind CSS, Zustand, React Query, HTML5/CSS3
• Mobile: React Native CLI, Expo, iOS/Android deployment
• Backend: Node.js, NestJS, Express, Microservices, REST API design
• Infrastructure & Cloud: AWS (Lambda, VPC, NAT Gateway), CI/CD (GitHub Actions), Vercel, Domain & DNS Management
• Database & Tools: PostgreSQL (Prisma/Drizzle), MongoDB, Redis, WebSockets (Socket.io)
WORK EXPERIENCE

Full Stack Engineer | ZBL | 09/2025 – Present
• Architected and deployed serverless workflows using Node.js and AWS (Lambda, VPC, NAT Gateway), building a custom
integration engine that replaced a third-party automation SaaS and significantly reduced monthly operational costs.
• Built seamless data pipelines and API integrations between external services (Stripe, Softbook, Kwiga), internal websites,
HubSpot, and a proprietary custom CRM.
• Standardized website structure across multiple projects, implementing a Webpack build system with centralized reusable
components for faster deployment.
• Built a high-load CRM system for internal teams, featuring real-time WebSocket updates and custom role-based access
management.
Lead Mobile Developer | Independent Project — Educational App | 03/2025 – 05/2026
• Leading end-to-end development of a large-scale educational mobile application using React Native CLI, from architecture to
release.
• Owning the full product lifecycle: UI/UX implementation, complex state management, and backend communication with a
NestJS API.
Full Stack Developer | Skyads | 07/2024 – 05/2025
• Refactored a legacy React codebase and optimized Next.js rendering strategies (SSR/ISR), improving Core Web Vitals and
page load speed by 30%.
• Developed high-conversion landing pages and internal tools, ensuring pixel-perfect mobile responsiveness.
• Maintained Node.js server-side logic, improving form validation and error handling to increase successful data submission
rates.
Technical Integration Specialist (Part-time) | X-Media | 10/2023 – 04/2024
• Developed custom PHP-based APIs for secure, high-reliability data routing between internal systems and partner services.
• Collaborated cross-functionally to design and maintain integrations supporting high-volume traffic.
LANGUAGES

• English: Upper-Intermediate (B2)
• Ukrainian: Native
• Polish: Upper-Intermediate (B2)