Senior Frontend Developer
Does Plain Concepts sponsor H-1B visas?
Check real filing data, salaries & approval rates on VisaTalentUSA
Job Description
Remote development roles on HireSkys cover frontend, backend, full-stack, DevOps, and QA work. Employers here usually name their exact stack in the description — compare the required tools against your own experience before applying, and use the Skill Gap Analyzer below to spot what to learn next.
Key Skills Required
Master these to land this role
Want to know if you're a match for this job?
We’re looking for a Senior Frontend Developer to join our team for an initial 6 months project and help us build high-quality web applications used in real-world projects. You’ll work mainly with React and TypeScript, taking ownership of features from the initial idea through to production. You’ll also have the opportunity to work on some interesting challenges around 3D visualisation, interactive maps, and data-heavy applications.
What you’ll do
- Build and maintain web applications using React and TypeScript.
- Work closely with Product, Design, Backend, and other developers to turn requirements into solid technical solutions.
- Help shape and improve our frontend architecture and development practices.
- Ensure our applications are fast, responsive, accessible, and easy to maintain.
- Work with UI libraries and design systems to create consistent user experiences.
- Review code and share knowledge and best practices with the team.
- Work on 3D visualisations and interactive experiences directly in the browser.
- Develop features around interactive maps and geospatial data.
Requirements
- 5+ years of experience in Frontend Development.
- Strong experience with React.
- Strong knowledge of TypeScript and JavaScript.
- Experience working on large or complex web applications.
- Good understanding of frontend architecture, patterns, and best practices.
- Experience integrating REST APIs and working with backend services.
- Strong knowledge of HTML, CSS, responsive design, and browser behaviour.
- Comfortable working with Git and modern development workflows.
- Ability to work independently, make technical decisions, and take responsibility for your work.
- Good communication skills and a collaborative mindset.
- English Level: Fluent
- All candidates must be based in Portugal or Brazil.
Nice to have
- Experience with Material UI or other UI/component libraries.
- Experience with Tailwind CSS or similar frameworks.
- Experience with Three.js, WebGL, or other technologies for building 3D experiences in the browser.
- Experience with Mapbox, Leaflet, OpenLayers, or similar mapping technologies.
- Experience building applications involving large amounts of data or complex visualisations.
- Knowledge of frontend performance optimisation.
- Experience with automated testing.
- Experience working in an Agile/Scrum environment.
A little extra
We’re particularly interested in people who enjoy working on things beyond traditional frontend development. We have upcoming projects involving 3D visualisation in the browser, so experience with Three.js, WebGL, or similar technologies would be a big plus. We also work with applications where maps and geospatial data play an important role. Experience with mapping libraries such as Mapbox, Leaflet, or OpenLayers is therefore very welcome.
Most importantly, we’re looking for someone who enjoys solving problems, cares about the quality of what they build, and wants to have a real impact on the products they work on!
How would you rate this job post?
See what other professionals think about this role.
How applying works on HireSkys
- 1.Click Apply. You go to the application — the employer's own page or form, or the HireSkys apply flow — and submit your profile as the employer asks.
- 2.The employer reviews. Shortlisting is done by the employer, not by HireSkys, so the timeline and next steps come from them.
- 3.Hear back directly. If shortlisted, the employer contacts you directly. Applying through HireSkys is free for jobseekers — never pay for a job application.
Similar Opportunities
Senior Software Engineer
Lively
Portugal
Senior Full-Stack Developer (AI-Powered B2B Platform)
5Blue Software
Ukraine
Romania
Software Developer (Backend) - Subscription & Order Management Platform
Stack Builders
Brazil
Software Engineer (.NET) - Backend Commerce & Payment Platforms
Lastpass
PortugalMore Openings at Plain Concepts
Explore Top Companies in this Space
Beyond
IT Consulting / Cloud Modernization / AI Engineering
Ontrac Solutions
IT Consulting / AI & Cloud Transformation / Staff Augmentation
3Cloud
IT Consulting / Microsoft Azure / Cloud Services / AI
Egen
IT Consulting / Cloud Engineering / Data & AI Services
Plain Concepts
View Company ProfilePlain Concepts is a premier, global technology consulting firm engineered to orchestrate enterprise-scale digital transformation and innovation. Operating as a high-velocity solutions provider, the company specializes in deploying cutting-edge artificial intelligence, robust infrastructure modernization, and advanced data analytics ecosystems. Moving beyond traditional IT services, Plain Concepts leverages its deep technical expertise to build custom enterprise applications, integrate resilient DevSecAIOps pipelines, and secure AI-driven workflows through its specialized AI Security Studios. Under the hood, their highly scalable architecture and strategic cloud partnerships empower organizations to transition from legacy systems to agile, data-driven infrastructures. What sets Plain Concepts apart is its uncompromising dedication to measurable commercial impact; serving as a holistic innovation partner with over 700 experts across 26 global delivery centers, they seamlessly bridge the gap between emerging technological thought and tangible, real-world business value.
Safety First
- Never pay for a job application.
- Do not share sensitive bank info.
- Verify the client before starting work.