Oleksii

Oleksii Maslak
Product Engineer | Fullstack (React & Node.js) | AI-Driven Development
Brovary, Ukraine | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section)
GitHub: github.com/OleksiiMaslak | LinkedIn: [open contact info](look above in the "contact info" section)

PROFESSIONAL SUMMARY
Product-minded Engineer with 4+ years of experience building high-performance web applications and 1+ year leading
engineering teams. Expert in React, Next.js, and TypeScript, with a strong focus on creating user-facing products and end-
to-end feature delivery. Proven track record of taking ownership of product decisions, improving user-centric metrics (like
performance/load time by 20%), and working in environments requiring high autonomy. Actively leverages AI tools (Copilot,
ChatGPT, Claude) to accelerate development and enhance product logic.

TECHNICAL SKILLS
• Core Stack: React, Next.js, TypeScript, Node.js (Express.js).
• Product Tools & Mindset: User Impact Focus, Discovery Support, A/B Testing, Product Metrics (Retention/
Engagement).
• Frontend & Styling: Tailwind CSS, SCSS, Styled Components, Ant Design.
• Backend & Infrastructure: Node.js, PostgreSQL, Redis, WebSockets, Docker.
• Tooling: GitLab, Vercel, Vite, CI/CD pipelines.
• AI Expertise: Active use of Copilot, ChatGPT, and Claude for code generation and architectural decisions.

WORK EXPERIENCE
Frontend Lead → Product-Focused Lead | SDE Group
Apr 2025 – Present
• Product Ownership: Lead a team of 7 engineers with a focus on delivery and user impact, moving beyond simple code
execution.
• End-to-End Delivery: Own the frontend architecture and technical strategy, aligning features directly with product
goals.
• Collaboration & Discovery: Work closely with product and backend teams to define product logic and drive technical
decision-making.
• AI Integration: Implement AI-driven workflows (Copilot, ChatGPT) to increase team velocity and explore AI-enhanced
product features.
• Scalable Solutions: Designed a micro-frontend platform to enable independent feature delivery and rapid
experimentation.
Frontend Developer (Junior → Middle) | Royal Leads
2023 – Apr 2025
• User Impact: Developed scalable SPAs and complex UI systems, directly influencing user experience for a large-scale
product.
• Data-Driven Optimization: Improved application performance and load times by ~20%, directly impacting user
engagement.
• Autonomy: Promoted within 2 years due to high responsibility, initiative, and the ability to deliver stable integrations.

KEY ACHIEVEMENTS & PRODUCT IMPACT
• Performance Engineering: Implemented lazy loading, code splitting, and memoization to reduce bundle size,
significantly improving rendering performance.
• Critical Problem Solving: Resolved major production issues in legacy systems by identifying root causes in complex
UI lifecycles, restoring functionality for a critical user segment.
• Process Leadership: Improved development speed and delivery predictability by establishing clear engineering
standards and review processes.

EDUCATION & LANGUAGES
• PhD (in progress): History & Archaeology – Taras Shevchenko National University of Kyiv.
• Master's Degree: Logistics – National Aviation University.
• Languages: English (B2), Ukrainian (Native), Russian (C2).