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Senior Fullstack Engineer with 10 years of experience building scalable web platforms and customer-facing digital products. Developed high-performance web applications using React, Next.js, and TypeScript, and designed REST and GraphQL APIs using Node.js and Express.js. Built high-performance, data-intensive systems at the intersection of finance, AI, and Web3, leveraging Python-driven analytics and Node.js. Experienced in collaborating across distributed systems to ensure scalability, reliability, and measurable performance improvements.…Senior Fullstack Engineer with 10 years of experience building scalable web platforms and customer-facing digital products. Developed high-performance web applications using React, Next.js, and TypeScript, and designed REST and GraphQL APIs using Node.js and Express.js. Built high-performance, data-intensive systems at the intersection of finance, AI, and Web3, leveraging Python-driven analytics and Node.js. Experienced in collaborating across distributed systems to ensure scalability, reliability, and measurable performance improvements.

Katarzyna Jamro

Full Stack Developer, Web Developer, Back-End Developer, +2

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Senior Fullstack Engineer with 10 years of experience building scalable web platforms and customer-facing digital products. Developed high-performance web applications using React, Next.js, and TypeScript, and designed REST and GraphQL APIs using Node.js and Express.js. Built high-performance, data-intensive systems at the intersection of finance, AI, and Web3, leveraging Python-driven analytics and Node.js. Experienced in collaborating across distributed systems to ensure scalability, reliability, and measurable performance improvements.…Senior Fullstack Engineer with 10 years of experience building scalable web platforms and customer-facing digital products. Developed high-performance web applications using React, Next.js, and TypeScript, and designed REST and GraphQL APIs using Node.js and Express.js. Built high-performance, data-intensive systems at the intersection of finance, AI, and Web3, leveraging Python-driven analytics and Node.js. Experienced in collaborating across distributed systems to ensure scalability, reliability, and measurable performance improvements.

Available to hire

Senior Fullstack Engineer with 10 years of experience building scalable web platforms and customer-facing digital products. Developed high-performance web applications using React, Next.js, and TypeScript, and designed REST and GraphQL APIs using Node.js and Express.js.

Built high-performance, data-intensive systems at the intersection of finance, AI, and Web3, leveraging Python-driven analytics and Node.js. Experienced in collaborating across distributed systems to ensure scalability, reliability, and measurable performance improvements.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Rust

Intermediate

Solidity

Intermediate

Language

Aragonese

Advanced

Javanese

Intermediate

Work Experience

Senior Fullstack Engineer at Clarion Events

January 1, 2025 - April 1, 2026

Transformed a high-performance, data-intensive application using Next.js and Node.js, improving throughput and reducing latency, enabling support for 20K requests/day across 10 services. Introduced TypeScript-based type checking to improve frontend code quality and reduce defects. Established ownership of backend services and migrated from REST to GraphQL to improve data fetching efficiency. Scaled a Web3-based trading platform and led development of multiple data-intensive applications, focusing on testing and performance. Overhauled legacy frontend to TypeScript and Tailwind CSS to improve maintainability and reduce bug-fixing time. Architected AI-driven analytics integration with Python/ML to improve predictive accuracy, and modernized the financial data pipeline using Kafka and MongoDB/Node.js with reduced processing time and infrastructure cost savings.

Full Stack Engineer at lineheights

March 1, 2021 - December 1, 2024

Implemented TypeScript type checking across the frontend codebase, reducing errors and improving developer productivity. Optimized Node.js and Next.js performance across 10 services to reduce load times and increase engagement. Refactored frontend architecture toward a microservices-based approach, improving maintainability and reducing bugs. Designed and built REST APIs with Express.js and Node.js to support financial data and trading integrations with high request throughput and strong uptime. Developed a Web3 trading platform MVP using Next.js/TypeScript, improving acquisition and revenue metrics. Maintained performance-focused builds using Webpack/Vite to reduce latency and support reliability. Built backend services to integrate AI analytics and financial data for multiple trading platforms, handling high transaction volumes and reducing latency.

Web Engineer at Netguru

July 1, 2017 - February 1, 2021

Built high-performance web applications across multiple services using React, Node.js, and TypeScript, taking work from concept to deployment. Automated testing to reduce bugs significantly and increase coverage by adopting Jest/Enzyme and CI processes across many services. Reviewed large volumes of code to improve maintainability and reduce technical debt using ESLint and TypeScript tooling. Partnered with design to ship frontend updates using HTML/CSS/React, improving engagement and session duration. Improved application latency via bundling and code-splitting techniques. Delivered scalable and secure backend services supporting AI analytics and financial data, enabling trading platforms and handling large transaction volumes.

Web Application Engineer at GlobalLogic

June 1, 2015 - July 1, 2017

Migrated a web application from monolithic to microservices architecture using Docker and Kubernetes, improving response time and reliability. Shipped high-performance data-intensive applications in finance/AI/Web3 with React/Node.js/TypeScript, contributing to business growth and scaling to large user bases. Migrated the frontend from jQuery to React and delivered interface improvements in collaboration with design. Integrated AI-driven analytics using Python and ML frameworks to improve predictive modeling accuracy on high-value transactions. Integrated blockchain ledger components using Go and Ethereum for secure storage/transfer with high transaction volumes and uptime. Developed frontend type-checking with TypeScript to reduce debugging time and maintenance effort.