Marina S.

If you need a full stack developer and engineer who can deliver without rework, I can help.
✅ 6,000+ hours worked on real client projects
✅ 15+ MVPs delivered, from idea to working product, ready to scale
✅ 100% Job Success Score
✅ Top 3% of talent on Upwork
Beyond building from the ground up, I specialize in jumping into existing codebases to stabilize and scale them. Whether you are dealing with technical debt, legacy systems, or performance bottlenecks, I provide deep-dive audits, refactoring, and feature optimization to ensure your current product is production-ready and built to handle increasing user loads.
I’m a senior full stack engineer working with React, Node.js, Python, and PHP. In my work, I focus on building real products end-to-end, from idea to production, with full ownership and predictable delivery.
I work primarily as a full stack engineer specializing in React and Node, building modern web applications using React, Next.js, and Node.js. On the backend, I also work as a full stack engineer with Python and PHP, choosing the right stack based on the product and scaling needs.
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Skills & Services
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▸ Backend: Node.js, Python, PHP, Laravel, Express
▸ Frontend: React, Next.js, JavaScript
▸ Databases: PostgreSQL, MySQL, MongoDB
▸ APIs: REST APIs, third-party integrations
▸ DevOps: AWS, Docker, CI/CD
As a full stack engineer (Node.js/Python), I build robust APIs, business logic, and complex integrations. As a full stack engineer (React/Next.js), I build fast, clean, and scalable interfaces.
I often lead full stack engineer React Node projects, connecting frontend and backend into a single reliable system. I also take on PHP projects when stability and speed of delivery are critical.
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How I Work as a Full Stack Engineer
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As an experienced full stack developer, I focus on:
– Clean and scalable architecture
– Fast frontend with React and Next.js
– Stable backend with Node.js, Python, or PHP
– Production-ready delivery
I can join as a full stack engineer or take a broader role with total ownership over architecture and execution.
Beyond standard engineering, I bring the comprehensive mindset of a senior web developer to modernizing legacy systems. For instance, if your platform was originally built by a WordPress developer and is now struggling to scale, I specialize in migrating those monolithic systems into custom, high-performance architectures. If your business has outgrown what a standard WordPress developer can provide, I can rebuild your platform from scratch. As a React developer, I transform outdated interfaces into blazing-fast web apps. Additionally, while I am not a native mobile app developer, I regularly collaborate with your mobile app developer team by building the robust backend infrastructure and optimized REST/GraphQL APIs they need. Every professional web developer knows that a great frontend depends on a solid backend, so I ensure that your mobile app developer gets seamless, well-documented endpoints, while I focus on the web ecosystem as a dedicated React developer. Ultimately, whether you are transitioning away from a legacy WordPress developer setup, looking for a web developer to build enterprise-grade systems, or need a React developer who knows how to support a mobile app developer, I deliver clean, production-ready code. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Experience ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ▸ SaaS products ▸ Internal tools and dashboards ▸ Travel & Logistic platforms ▸ Fintech platforms ▸ E-commerce systems As a full stack developer React Node, I deliver complete products that are ready for real users and real load. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ If you are looking for a full stack engineer who can take ownership and ship, feel free to reach out.