09/22/2026 updated
100 % available
Senior Frontend Engineer
Vilnius, Lithuania
Only remote
Bachelor Degree of InformaticsAbout me
Senior frontend engineer with 5+ years of experience building and architecting complex, large-scale SaaS environments. Experienced in developing user interfaces, integrating APIs, and creating scalable frontend architectures. Expert in Angular (TypeScript) with background in Python and GenAI.
StorybookVitestAzure DevOpsPython (Programming Language)Scrum MethodologyAngular 2+TypeScriptTailwindGenerative AIGitFull Stack DevelopmentFront End Software Development
Angular & TypeScript Development
Expert-level knowledge in Angular 21+ and TypeScript, with extensive experience building and architecting complex, large-scale SaaS environments, including re-architecting legacy AngularJS applications into modern SPAs using Angular 21+, Signals, Vite, and Tailwind CSS 4.
Frontend Architecture & Performance Optimization
Strong background in designing scalable frontend architectures, codebase refactoring, performance optimization, Core Web Vitals, and multi-tenant architectures, with hands-on experience in component design systems using Figma to Storybook workflows.
Web Accessibility & Security Compliance
Proven expertise in ensuring WCAG 2.2 AA compliance and frontend security, including strict CSP compliance, input sanitization, and dependency audits across large-scale platforms.
JavaScript & Modern Frontend Frameworks
Solid proficiency in JavaScript and TypeScript, with practical experience using Astro, React, RxJS, Vitest, Jest, and Tailwind CSS 4 in production environments.
Python & Machine Learning
Project-level experience with Python, including building customer churn prediction models, data cleaning, feature engineering, and evaluating classifiers such as Random Forest and XGBoost using libraries like Pandas, NumPy, scikit-learn, and Matplotlib.
AI Tooling & Generative AI Workflows
Background in generative AI workflows using LangGraph, LangChain, and Agents SDK, as well as practical use of AI tooling such as Cursor and Copilot.
Scrum & Agile Methodologies
Certified ScrumMaster (CSM) by Scrum Alliance with hands-on experience leading retrospectives, planning sessions, refinements, and daily standups as Scrum Master for a frontend team.
Design Systems & Storybook
Experience developing and maintaining component design systems with enforced layer boundaries, utilizing Storybook and integrating designs from Figma.
Azure DevOps & CI/CD
Practical experience with Azure DevOps, including authoring and publishing a custom extension to the Azure DevOps Marketplace.
Algorithms & Data Structures
Solid understanding of algorithms and data structures as part of a computer science foundation from Engineering Informatics studies.
Expert-level knowledge in Angular 21+ and TypeScript, with extensive experience building and architecting complex, large-scale SaaS environments, including re-architecting legacy AngularJS applications into modern SPAs using Angular 21+, Signals, Vite, and Tailwind CSS 4.
Frontend Architecture & Performance Optimization
Strong background in designing scalable frontend architectures, codebase refactoring, performance optimization, Core Web Vitals, and multi-tenant architectures, with hands-on experience in component design systems using Figma to Storybook workflows.
Web Accessibility & Security Compliance
Proven expertise in ensuring WCAG 2.2 AA compliance and frontend security, including strict CSP compliance, input sanitization, and dependency audits across large-scale platforms.
JavaScript & Modern Frontend Frameworks
Solid proficiency in JavaScript and TypeScript, with practical experience using Astro, React, RxJS, Vitest, Jest, and Tailwind CSS 4 in production environments.
Python & Machine Learning
Project-level experience with Python, including building customer churn prediction models, data cleaning, feature engineering, and evaluating classifiers such as Random Forest and XGBoost using libraries like Pandas, NumPy, scikit-learn, and Matplotlib.
AI Tooling & Generative AI Workflows
Background in generative AI workflows using LangGraph, LangChain, and Agents SDK, as well as practical use of AI tooling such as Cursor and Copilot.
Scrum & Agile Methodologies
Certified ScrumMaster (CSM) by Scrum Alliance with hands-on experience leading retrospectives, planning sessions, refinements, and daily standups as Scrum Master for a frontend team.
Design Systems & Storybook
Experience developing and maintaining component design systems with enforced layer boundaries, utilizing Storybook and integrating designs from Figma.
Azure DevOps & CI/CD
Practical experience with Azure DevOps, including authoring and publishing a custom extension to the Azure DevOps Marketplace.
Algorithms & Data Structures
Solid understanding of algorithms and data structures as part of a computer science foundation from Engineering Informatics studies.
Experience
Professional experience5 - 10 years
Freelancer since2026
Languages
EnglishFluentPolishGoodRussianFluentLithuanianNative speaker
Project history
• Frontend development on a multi-tenant case management platform for the Dutch public sector.
• Engineered and maintained a large-scale SaaS platform focusing on codebase refactoring, performance optimization, and architectural scalability.
• Re-architected legacy large-scale AngularJS application into modern Angular SPA using Angular 21+, Signals, Vite, and Tailwind CSS 4.
• Developed a component design system with enforced layer boundaries (Figma to Storybook).
• Ensured WCAG 2.2 AA compliance and frontend security (strict CSP, input sanitization, dependency audits).
• Served as Scrum Master for the frontend team, leading retrospectives, planning, refinements, and dailies.
• Authored and published a custom extension for the Azure DevOps Marketplace.
Tech stack: Angular, TypeScript, RxJS, Tailwind CSS, Jest, Vite, Vitest, Nx, Storybook, Zod, Azure DevOps.
• Built a customer churn prediction model in Python.
• Queried and analyzed data from BigQuery.
• Performed data cleaning and preprocessing.
• Performed feature engineering, evaluated multiple classifiers (e.g., Random Forest, XGBoost), and tuned hyperparameters via grid/random search.
Tech stack: Python, BigQuery, Pandas, NumPy, scikit-learn, Matplotlib, Seaborn, LaTeX.