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Yevhen Bychkov

@yevhenbychkov

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I build SaaS and learning platforms with React, TypeScript, Node.js, and MySQL.

Poland

Message

I've built SaaS and learning-platform features at pdfFiller / airSlate and Careerist, spanning React and TypeScript interfaces, Node.js services, API design, and data modeling.

At pdfFiller / airSlate, I delivered collaboration, commenting, AI document-generation, and editing capabilities, while modernizing CoffeeScript-era code to TypeScript. I improved critical document-view LCP from approximately 3.6 seconds to 2.5 seconds and supported production releases and hotfixes.

At Careerist, I built course and lesson authoring, homework assignment and review, attachments, and student-learning workflows. I also designed MySQL models and REST APIs for courses, lessons, and roles.

Experience

Work history, roles, and key accomplishments

Software Engineer

pdfFiller / airSlate

Nov 2021 - Aug 2026 (4 years 9 months)

Co-designed frontend/backend integration contracts and architecture decision records. Built collaboration modules, modernized legacy code, and improved performance and quality across multiple teams.

React TypeScript Next.js Tanstack Query Webpack Jest React Testing Library Playwright Grafana Vercel AI SDK Server Sent Events API Design Architecture Legacy Modernization

Full-Stack Developer

Careerist

Sep 2020 - Nov 2021 (1 year 2 months)

Built React and TypeScript interfaces and Node.js services for course authoring, homework assignment, and student learning. Designed MySQL data models and REST API contracts.