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Backend Engineer
Experienced Backend Engineer with a strong focus on building high-load servers, microservices and monolith architectures, integrations, and automated software. Skilled in delivering production-grade projects with Node.js, NestJS, TypeScript, Salesforce B2C Commerce, MuleSoft, and platforms serving 1M+ live customers. Passionate about developing scalable e-commerce solutions, robust API integrations, event-driven architectures, and optimized backend infrastructures. Proven expertise in deployment automation (Docker, AWS, CI/CD), release management, mentoring developers, and driving code quality. Additionally, applying AI-driven prompt engineering and LLM tooling (LangChain, Claude, Cursor) to help startups rapidly test product ideas and run lean marketing experiments.
Experience: 5 years
Yearly salary: $70,000
Hourly rate: $30
Nationality: 🇺🇦 Ukraine
Residency: 🇵🇱 Poland
Experience
Backend Engineer
Vault 2022 - 2023
Developed and maintained controllers, models, and middlewares on Salesforce Commerce Cloud (SFCC). Implemented custom SFCC cartridges and SFRA architecture modifications. Integrated payment solutions: Adyen, Stripe, Binance Pay (Crypto), Apple/Google Pay, Skrill, LiqPay, Portmone. Implemented analytics using GA4/GTM/Meta, developed custom cookie consent banner. Led Knowledge Sharing Sessions and mentored junior developers. Developed a solution for limit quota issue in SFCC. Implemented features: accessibility, international track order functionality, AI-powered product recommendations. Participated in microservices architecture development serving 700+ concurrent users. Built fast, high-load APIs for a large customer base. Involved as backend developer in Telegram bot development and database management for online store (3000+ users). Implemented automated bots for data collection and notification using Puppeteer. Developed comprehensive test suites (unit, integration). Conducted code reviews and maintained code quality standards. Managed deployments using Jenkins, Netlify, Render, AWS, GitHub Actions, Docker.
JavaScript Developer
HITACHI GROUP 2020 - 2022
Developed custom data collectors for client platforms with paginated collection and automated feed with parsed info through SOAP and HTTP. Maintained data collection systems with complex effective abstractions and architectural designs. Technologies used: JavaScript, Puppeteer, jQuery, Node.js, Express.
Skills
aws
docker
mongo
nestjs
node
postgres
rabbitmq
react
redis
english
ukrainian