12/09/2025 updated
HM
100 % available
Senior Full-Stack Developer
Zary, Poland
Only remote
Master of Software Engineering & Computer ScienceJavaScriptApplication Programming Interfaces (APIs)Amazon Web ServicesAmazon Elastic Compute CloudAmazon S3ArchitectureAuthenticationsAutomationCloud EngineeringData ModelingDatabase DesignDevOpsWeb DevelopmentGitHubInfrastructure Management
Full-Stack Web Development
Expertise in designing and building high-performance web applications using modern JavaScript frameworks like React, Next.js, Vue.js, combined with backend technologies including Node.js, Express.js, and Python
Cloud Architecture & DevOps
Proficiency in AWS services (EC2, Lambda, S3, RDS), Docker containerization, CI/CD pipelines with GitHub Actions, and infrastructure automation
Database Design & Management
Advanced knowledge in PostgreSQL, MySQL, MongoDB, Firebase, and Redis for scalable data modeling and backend engineering
API Development
Experience with REST APIs, GraphQL, and WebSockets for complex API-driven systems
Testing & Quality Assurance
Proficiency in Jest, Mocha, Cypress, and Selenium for comprehensive testing strategies
Software Architecture
Knowledge of Microservices, Clean Architecture, SOLID Principles, TDD, and Agile/Scrum methodologies
Authentication & Security
Implementation of OAuth2, JWT Auth, and secure payment integrations with Stripe/PayPal
Performance Optimization
Expertise in caching, server optimization, query tuning, and automation workflows
Expertise in designing and building high-performance web applications using modern JavaScript frameworks like React, Next.js, Vue.js, combined with backend technologies including Node.js, Express.js, and Python
Cloud Architecture & DevOps
Proficiency in AWS services (EC2, Lambda, S3, RDS), Docker containerization, CI/CD pipelines with GitHub Actions, and infrastructure automation
Database Design & Management
Advanced knowledge in PostgreSQL, MySQL, MongoDB, Firebase, and Redis for scalable data modeling and backend engineering
API Development
Experience with REST APIs, GraphQL, and WebSockets for complex API-driven systems
Testing & Quality Assurance
Proficiency in Jest, Mocha, Cypress, and Selenium for comprehensive testing strategies
Software Architecture
Knowledge of Microservices, Clean Architecture, SOLID Principles, TDD, and Agile/Scrum methodologies
Authentication & Security
Implementation of OAuth2, JWT Auth, and secure payment integrations with Stripe/PayPal
Performance Optimization
Expertise in caching, server optimization, query tuning, and automation workflows
Experience
Professional experience5 - 10 years
Freelancer since2020
Languages
EnglishFluentPolishNative speaker
Project history
Design and develop scalable web applications and internal systems using React, Node.js, TypeScript, PostgreSQL. Build end-to-end automation workflows, architect databases and API integrations, integrate business systems with payment processors and AI tools.
Developed feature-rich platforms for SaaS prototypes, e-commerce systems, education tools using React, Next.js, and Express/Node. Implemented user authentication, subscriptions, data modeling, and metrics dashboards using PostgreSQL, MongoDB, and Firebase.
Assisted with building modular web applications using JavaScript, PHP, MySQL, Bootstrap, and WordPress. Built and maintained admin dashboards, custom CRM modules, and form-based systems. Debugged and refactored legacy code, managed deployments and security hardening.