Senior Frontend Engineer - Freelance

OpenKrill; United States; Remote; USD 68,000 - 91,000; Full time

Job summary

Beyond Sports is seeking a Senior Frontend Engineer (Contractor/Freelance) based in Hungary for a 3-month engagement. You will build responsive frontend solutions using React, vanilla JavaScript, and modern UI practices, delivering high-quality code and collaborating with design and backend teams.

The role emphasizes self-driven delivery, clean code, and performance optimization, with remote work from Hungary and a daily rate in the contract range.

Qualifications

• HTML/CSS and responsive design principles.
• JavaScript (vanilla) proficiency.
• React expertise.
• SASS development and styling workflows.
• JSON and RESTful APIs integration.
• Gulp workflows for build processes.
• Git and version control best practices.
• Cross-browser testing and debugging.
• Translating design files (Figma/Sketch) into code.
• Frontend performance tuning and optimization.

Responsibilities

• Translate project requirements into frontend code.
• Estimate and manage own tasks to meet timelines.
• Integrate with backend APIs and third-party services.
• Produce reusable, maintainable code.
• Ensure cross-browser and cross-device compatibility.
• Implement responsive UI/UX using HTML, CSS/SASS, JavaScript.
• Utilize Gulp and Git in a collaborative codebase.
• Collaborate with delivery team on goals and timelines.
• Identify and resolve frontend blockers.
• Document frontend solutions for maintenance and handovers.

Skills

HTML & CSS

JavaScript (vanilla)

React

SASS development

JSON & RESTful APIs

Frontend performance

Cross-browser testing

Documentation

Design-to-code translation

Responsive design

Tools

Gulp workflows

Git version control

NPM

Bower

JIRA

Job description

Senior Frontend Engineer (Contractor/Freelance) - Hungary

Duration: 3 months plusRate: 120,000 - 160,000 per day HUFStart Date: ASAPLocation: Must be based in Hungary, Remote Working

About the Role:

As a Senior Frontend Engineer (Contractor/Freelancer) at Beyond Sports, you will play a key role in delivering high-quality, performant, and engaging frontend solutions to sports fans and partners worldwide. Working alongside a cross-functional team, you’ll be responsible for building and maintaining responsive web applications using modern frontend technologies and best practices.

This role is delivery-focused, suited for a self-driven contractor who thrives on writing clean, scalable code, solving complex problems, and delivering against clearly defined requirements. You’ll work closely with designers, backend developers, and project managers to ensure that deliverables meet expectations and deadlines.

Key Responsibilities

• Translate project requirements and designs into functional, maintainable frontend code
• Scope, estimate, and manage your own tasks to meet agreed timelines
• Integrate with backend APIs and third-party services
• Produce high-quality, reusable code with attention to maintainability and performance
• Ensure cross-browser and cross-device compatibility through rigorous testing and debugging
• Implement responsive UI/UX using HTML, CSS/SASS, and JavaScript (vanilla)
• Use Gulp workflows and Git version control effectively within a collaborative codebase
• Collaborate with the wider delivery team to ensure alignment on goals and timelines
• Proactively identify and resolve frontend issues or technical blockers
• Document frontend solutions to support ongoing maintenance and handovers

Required Skills & Experience

Expert-level knowledge of:

• HTML, CSS, and responsive design principles
• JavaScript (vanilla)
• React
• SASS development
• JSON and RESTful APIs
• Gulp workflows
• Git and version control best practices
• Cross-browser/device testing and debugging
• Working with design files and translating them into code (e.g. Figma, Sketch)
• Frontend performance tuning and optimization
• Writing clean, readable documentation for frontend solutions

Comfortable with:

• ES6/ES7 features
• Integrating third-party tools and SDKs (e.g. video providers)
• NPM and Bower for dependency management
• Web accessibility (a11y) best practices
• SEO best practices for frontend builds
• JIRA or similar tools for task tracking

Nice to Have

• Familiarity with CI/CD processes for frontend deployment
• Understanding of frontend architecture patterns and modular development