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Hi, I'm Sergiusz Kamianiok, a Frontend Engineer with 8+ years building and modernizing SaaS products. I specialize in React, TypeScript, Next.js, and frontend architecture focused on maintainability and production quality. I led migrations from jQuery, Angular, and Formik-based systems to modern React/Next.js solutions, designed micro-frontend architecture and reusable UI components for distributed engineering teams. I improved productivity through engineering standards, automated testing, CI/CD, and AI-assisted workflows.…Hi, I'm Sergiusz Kamianiok, a Frontend Engineer with 8+ years building and modernizing SaaS products. I specialize in React, TypeScript, Next.js, and frontend architecture focused on maintainability and production quality. I led migrations from jQuery, Angular, and Formik-based systems to modern React/Next.js solutions, designed micro-frontend architecture and reusable UI components for distributed engineering teams. I improved productivity through engineering standards, automated testing, CI/CD, and AI-assisted workflows.

Sergiusz Kamianiok

Front-End Developer, Web Developer, Developer, +2

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Hi, I'm Sergiusz Kamianiok, a Frontend Engineer with 8+ years building and modernizing SaaS products. I specialize in React, TypeScript, Next.js, and frontend architecture focused on maintainability and production quality. I led migrations from jQuery, Angular, and Formik-based systems to modern React/Next.js solutions, designed micro-frontend architecture and reusable UI components for distributed engineering teams. I improved productivity through engineering standards, automated testing, CI/CD, and AI-assisted workflows.…Hi, I'm Sergiusz Kamianiok, a Frontend Engineer with 8+ years building and modernizing SaaS products. I specialize in React, TypeScript, Next.js, and frontend architecture focused on maintainability and production quality. I led migrations from jQuery, Angular, and Formik-based systems to modern React/Next.js solutions, designed micro-frontend architecture and reusable UI components for distributed engineering teams. I improved productivity through engineering standards, automated testing, CI/CD, and AI-assisted workflows.

Available to hire

Hi, I’m Sergiusz Kamianiok, a Frontend Engineer with 8+ years building and modernizing SaaS products. I specialize in React, TypeScript, Next.js, and frontend architecture focused on maintainability and production quality.

I led migrations from jQuery, Angular, and Formik-based systems to modern React/Next.js solutions, designed micro-frontend architecture and reusable UI components for distributed engineering teams. I improved productivity through engineering standards, automated testing, CI/CD, and AI-assisted workflows.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

English

Advanced

Polish

Advanced

Work Experience

Senior Software Engineer (UI) at Grid Dynamics

February 1, 2024 - Present

Led frontend module release from setup to production readiness, including security assessments and manifests. Introduced TypeScript configuration and migrated modules to improve type safety, maintainability, and scalability. Implemented end-to-end tests to strengthen reliability and release confidence.

Remote Frontend Engineer (part-time) at Vivus Tech

November 1, 2020 - July 1, 2024

Modernized a legacy e-commerce app by migrating from jQuery/BigCommerce to Next.js and Strapi CMS. Converted Figma designs into production-ready Next.js pages and semantic Liquid templates for Shopify. Built reusable UI pages and components for customer-facing web experiences. Developed the company portfolio website using Django and JavaScript.

Frontend Engineer at OLX Group

December 1, 2023 - March 1, 2024

Developed production features using Vue 3 and the Composition API. Wrote automation tests using Playwright to improve coverage and release confidence. Worked with NestJS and AWS serverless architecture in a distributed product environment.

Software Engineer IV (UI) at Open X

November 1, 2022 - March 1, 2023

Migrated application modules from Formik to React Hook Form, improving form maintainability and developer experience. Converted a legacy Angular 2 app to React as part of frontend modernization. Built 10+ production pages and 30+ reusable components, including complex forms with React Hook Form. Used GitLab and GitHub Actions to support version control and CI/CD workflows.

Senior JavaScript Developer at Ciklum

October 1, 2021 - September 1, 2022

Designed and implemented a micro-frontend architecture using Webpack Federation. Integrated OCR forms tools based on an open-source project into a separate micro-frontend. Created Docker-based build configuration for Azure Pipelines to containerize the app build process.

Software Engineer (UI) at Field Code S

September 1, 2020 - September 1, 2021

Designed and implemented a stand-alone data visualization module using Victory chart library. Built a notification system using Broadcast Channel API and RxJS. Created 10+ pages and 30+ components, including forms, and integrated with 10+ REST APIs.

JavaScript Developer at EPAM Systems

December 1, 2018 - May 1, 2020

Implemented a complex wizard form component from scratch, including validations, page transitions, and business logic. Set up the project pipeline using Docker and Jenkins. Created 5+ pages and 30+ components, including a React data grid.

Junior Frontend Developer at Sam Solutions

November 1, 2017 - November 1, 2018

Designed app architecture using ES6 classes and modular SCSS; integrated WebSockets into an auction module; converted multiple Figma designs into production UI code.

JavaScript Developer at EPAM Apps (client: UKG - Ultimate Kronos Group)

November 1, 2007 - May 1, 2010

Designed and implemented a micro-frontend architecture using Webpack Module Federation. OCR form tools integrated as part of the project.

JavaScript Developer at EPAM Systems (client: UKG - Ultimate Kronos Group)

December 1, 2010 - May 1, 2017

JavaScript development across multiple UKG projects, including ES6-based architectures and UI development.

Software Engineer (UI) at RBS Services

December 1, 2003 - May 1, 2007

Integrated a multi-year UI architecture using ES3 classes and factory pattern; developed a Web-based e-commerce application.