Oleksandr

OLEKSANDR LUTSKIN
SENIOR FULL STACK DEVELOPER
Location: Kyiv, Ukraine Phone: [open contact info](look above in the "contact info" section) Email: [open contact info](look above in the "contact info" section)
LinkedIn: [open contact info](look above in the "contact info" section) GitHub: github.com/oleksandr-lutskin

SUMMARY

Results-driven Senior Full Stack Developer with 5+ years of experience designing, building, and scaling high-load production
web applications across FinTech, TravelTech, HealthTech, and E-Commerce. Highly proficient with React.js/Next.js on the
frontend and Node.js/NestJS on the backend, complemented by extensive hands-on AWS infrastructure deployment,
microservices architecture, and CI/CD ownership. Skilled at bringing greenfield products from architecture to production,
optimizing high-concurrency database queries, and leading key technical workflows.

SKILLS

Programming JavaScript (ES6+), TypeScript, SQL
Languages:
Frontend Development: React.js, Next.js, Redux Toolkit, Zustand, HTML5, CSS3, Tailwind CSS, Material UI
Backend Development: Node.js, NestJS, Express.js, RESTful APIs, WebSockets, gRPC, RabbitMQ
Architecture & Microservices, Event-Driven Architecture, PostgreSQL, MongoDB, Redis
Databases:
Cloud & AWS (EC2, S3, RDS, Lambda, ECS, CloudFront), Docker, Firebase, Kubernetes
Containerization:
CI/CD & Monitoring: GitHub Actions, Jenkins, Prometheus, Grafana
Testing & Tools: Jest, Cypress, Playwright, OAuth2, JWT

WORK EXPERIENCE

Solartrip | Senior Full Stack Developer May 2022 – Present

Global Flight Aggregation & Booking Platform
Domain: TravelTech | Global flight comparison & booking engine handling 300,000+ monthly bookings
Tech Stack: Next.js, React.js, TypeScript, NestJS, Node.js, PostgreSQL, Redis, RabbitMQ, gRPC, AWS ECS, Docker, GitHub Actions,
Jest
• Developed and maintained core flight aggregation, real-time filtering, ranking, and connecting-flight engines within a
microservices architecture for users in 100+ countries.
• Optimized PostgreSQL queries and implemented multi-layer Redis caching with RabbitMQ message queues and gRPC
for high-speed inter-service communication.
• Drove CI/CD pipeline improvements with GitHub Actions and Docker container optimization, setting up system
monitoring via Prometheus and Grafana for high observability.

Loyalty & Rewards Program Platform
Domain: FinTech & Travel Loyalty | Multi-currency user reward balances and payment gateway integration
Tech Stack: React.js, Redux Toolkit, Tailwind CSS, NestJS, REST APIs, PostgreSQL, AWS Lambda, S3, OAuth2, JWT, Cypress
• Engineered a secure travel rewards and cash-back system supporting multi-currency cashback calculation and
transaction logging.
• Built interactive user balance management dashboards and payment checkout flows integrated with external FinTech
gateways using JWT and OAuth2.
• Created serverless event handlers using AWS Lambda and S3 for automated monthly user statements and reward point
notifications.

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S-PRO | Full Stack Developer March 2021 – May 2022

WowBody - Interactive Health & Nutrition Platform
Domain: HealthTech & E-Learning | Personalized fitness coaching and meal management web platform
Tech Stack: Next.js, React.js, Redux Toolkit, TypeScript, HTML5, CSS3, NestJS, Express.js, RESTful APIs, PostgreSQL, MongoDB,
AWS (EC2, S3, RDS, Lambda)
• Led frontend development of interactive nutrition and workout modules with React and Redux Toolkit, increasing user
engagement by 25%.
• Engineered RESTful APIs with NestJS, cutting pre-order workflow processing time by 15% through streamlined data
integration.
• Optimized PostgreSQL and MongoDB database queries, accelerating data retrieval by 30% and sustaining a 40%
increase in active user interactions.
• Deployed and maintained AWS infrastructure (EC2, S3, RDS, Lambda), maintaining 99.9% uptime and high page speed
scores (95% mobile rating on Google PageSpeed).

E-Commerce Subscriptions & Payment Engine
Domain: E-Commerce & SaaS | Automated recurring billing and digital workout program marketplace
Tech Stack: React.js, Zustand, Material UI, Node.js, Express.js, MongoDB, Redis, WebSockets, Docker, AWS CloudFront, Playwright
• Designed an automated subscription management and digital content store frontend using React, Zustand, and Material
UI.
• Implemented WebSockets for real-time live workout session notifications and active user status updates.
• Integrated payment processor webhooks via Express.js microservices and optimized static asset delivery via AWS
CloudFront CDN.

EDUCATION

B.Sc. in Computer Engineering (Graduated with Honors) — Kyiv Polytechnic Institute

LANGUAGES

Ukrainian: Native | English: Advanced (C1)

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