Олександр

OLEKSANDR LISNYAK
FULLSTACK DEVELOPER

Fullstack developer with 5 years of continuous commercial experience building production web
applications across marketplace, fintech, travel, and marketing domains. Strong on the frontend with
React, Next.js, and TypeScript, and confident on the backend with Node.js, Express, REST APIs,
WebSockets, and SQL/NoSQL databases.

CORE SKILLS
FRONTEND BACKEND & API
React, Next.js, TypeScript, JavaScript (ES6+), Redux Node.js, Express.js, NestJS, REST APIs, GraphQL,
Toolkit / RTK Query, TanStack Query, Zustand, React WebSockets, Prisma / TypeORM, PostgreSQL,
Hook Form, Tailwind CSS MongoDB, Redis, JWT / OAuth
TESTING & PRACTICES TOOLS & DEVOPS
Jest, React Testing Library, Cypress, Agile / Scrum, Git / GitHub, Docker, CI/CD (GitHub Actions), Nginx,
code review, Figma, Storybook AWS basics, Postman, Vite / Webpack, AI-assisted
development

EXPERIENCE
Full Stack Engineer AutoNS | Sep 2025 - May 2026
Marketplace for buying and selling cars with advanced filters, real-time chat, media-heavy listings, and VIN verification.
Stack: React, TypeScript, Node.js, Express, PostgreSQL, Redis, WebSockets, Docker
Built faceted search and filtering over a large vehicle inventory with server-side pagination and caching,
substantially improving search response times.
Integrated a third-party VIN decoding API to show verified vehicle history directly on listing pages and reduce
manual seller checks.
Implemented real-time buyer-seller chat over WebSockets with delivery and read receipts for marketplace
conversations.
Built an image upload pipeline with automatic resizing and compression, significantly lowering listing media
payloads and page load times.

Full Stack Software Engineer Pulsepay | Jan 2025 - Aug 2025
Fintech SaaS platform for subscription automation, billing, invoicing, payment state tracking, and revenue analytics.
Stack: React, TypeScript, Node.js, Express, PostgreSQL, Stripe, RTK Query, Docker
Built a recurring billing engine integrating Stripe with support for trials, proration, and multiple subscription tiers.
Implemented automated invoicing with PDF generation and smart dunning / retry logic, reducing failed-payment
churn.
Designed a webhook-driven payment state machine that kept subscription status reliably in sync and eliminated
revenue-leakage edge cases.
Developed an admin analytics dashboard for MRR, churn, and LTV, replacing manual spreadsheet reporting for
internal users.

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EXPERIENCE CONTINUED
Software Engineer Travelync | Sep 2023 - Dec 2024
Travel platform for hotel booking, route planning, shared itineraries, and split-payments between friends.
Stack: Next.js, React, TypeScript, Node.js, REST APIs, PostgreSQL, Maps API, payment integrations
Developed the hotel search and booking flow with an availability calendar, dynamic pricing, and booking status
handling.
Built a split-payment feature letting groups share trip costs with automatic per-person balance calculation and
settlement.
Created an interactive itinerary and route builder with map integration, reusable trip blocks, and shareable trip
links.
Integrated payment flows for deposits, partial payments, refunds, and multi-currency trip expenses.

Fullstack Developer CreatorBoost | Apr 2021 - Aug 2023
Marketing platform for creators and influencers with ad analytics, campaign tracking, scheduled imports, and built-in
CRM.
Stack: React, JavaScript, Node.js, Express, MongoDB, REST APIs, TanStack Query, GitHub Actions
Built an analytics dashboard aggregating ad performance across channels with interactive drill-down charts.
Developed a CRM module for managing brand deals, contacts, campaign pipelines, and creator outreach
records end to end.
Implemented scheduled data-ingestion jobs and REST APIs to sync campaign metrics from external ad
platforms.
Improved dashboard load performance through query optimization, API response shaping, and client-side
caching with TanStack Query.

EDUCATION & LANGUAGES
Igor Sikorsky Kyiv Polytechnic Institute Languages
Bachelor's Degree in Software Engineering, Kyiv English B2 (Upper intermediate)
Ukrainian Native

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