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Role description

About The Company
GROPYUS is a technology-based construction company focused on building multi-story residential buildings. Thanks to its prefabricated building system with various design options, industrial offsite construction, and fully digitalized processes, the company manufactures aspirational, sustainable, and affordable homes using timber construction methods. GROPYUS is using scalable construction and manufacturing solutions to tap into a future market, boost Europe's strength in innovation, while also playing a substantial role in improving sustainability.

About the Role:
As a Frontend Software Engineer Freelancer (f/m/d), you will help shape the user experience of the tools that power GROPYUS' automated planning and production processes. You will work closely with engineers, product managers, and designers to deliver new features for our 3D parametric visualization and configuration platform.

Your primary focus will be evolving frontend experiences using React, integrating interactive 3D visualisation capabilities using Three.js and our internal canvas-based libraries, and creating intuitive workflows that help users interact with complex building data and parametric models. While frontend delivery is at the core of the role, you will also collaborate closely with backend services and occasionally contribute to API development where needed.

You will join a highly collaborative team that combines software engineering, automation, and 3D technology to transform how buildings are designed and manufactured. If you enjoy turning complex technical capabilities into seamless user experiences and are excited by the challenge of interactive 3D applications, this is the team for you.

We believe that curiosity, ownership, and a pragmatic mindset are more important than following a predefined career path. At GROPYUS, we value engineers who are passionate about delivering high-quality products, collaborating across disciplines, and continuously improving how we work.

You will need a self-employed/contractor setup for taxation purposes and you can work remotely from anywhere from EU. Project load is estimated at 30-40 hours weekly and total duration to 6-8 months.

What you bring:

Strong experience with React and modern TypeScript-based frontend development.
Experience building complex, interactive web applications with a focus on usability and performance.
Hands-on experience with Three.js or other 3D web technologies.
Experience working with HTML5 Canvas, WebGL, or similar visualisation frameworks.
Ability to translate product and design requirements into robust, user-friendly solutions.
Experience integrating frontend applications with GRPC APIs and backend services.
Comfortable working across the stack when needed, including implementing or extending backend endpoints.
Strong understanding of frontend architecture, state management, component design, and performance optimisation.
Experience working with design systems and collaborating closely with Product Designers.
Familiarity with testing, debugging, and maintaining production-grade applications.
Interest in 3D visualisation, CAD-like applications, digital planning tools, or parametric systems is a strong plus.
Experience with Kotlin, Azure, or backend development is beneficial but not required.

Join us on our mission to design buildings as continuously evolving products to create the most exciting and affordable experience for all. We build for people and conserve the resources of our planet.

We can't wait to get to know you.

For more information, visit our website.

This is a saved copy of a posting published elsewhere. Postings get taken down without notice — check the employer's site before applying. mentors.coach is not the hiring party.

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Mobile Developer

Senior iOS Developer

Immoweb

Remotefulltime

Apply on the employer's site

Role description

Build the platform where Belgium feels at home.
For over 30 years, Immoweb has been more than just a platform; we are the digital heartbeat of the Belgian real estate market. From first apartments to forever homes, we bridge the gap between dreams and reality for millions of users every month.

Our mission: to inspire, guide and close every home move in Belgium. We make real estate fast, transparent, and stress-free through world-class technology and human-centric support. We are dedicated to connecting people with their property goals, ensuring that at Immoweb, your work has an immediate, nationwide impact from day one.

Your Mission
Who we are
Immoweb is Belgium's leading real estate portal, part of AVIV Group, Europe's largest network of digital real estate marketplaces. Every month, hundreds of thousands of people use our iOS app to search, save, and get alerted about the properties that matter to them. We're currently modernising our native codebase — moving from an older UIKit/MVVM stack to a leaner, more testable Swift 6 architecture — while keeping the app running reliably for our existing user base.

The Seeker squad
You'll join Seeker, a full-stack squad (iOS, Android, Web, Backend, Design) that owns the end-to-end property search and discovery experience: search, filters, saved searches and alerts, and the property detail page. We work in close collaboration with product and design, ship through CI/CD, and care about shipping quality features that scale to hundreds of thousands of daily users.

What You'll Do

Design and build native iOS features for the Immoweb app, working closely with our Android, Web, Backend, and Design counterparts on shared feature sets.
Contribute to our ongoing migration from UIKit/legacy patterns to SwiftUI, @Observable, and Point-Free's modular architecture libraries.
Write clean, testable code (XCTest / Swift Testing) and review your teammates' work.
Continuously improve app quality, performance, and stability for a large, active user base.
Ship through our CI/CD pipeline in close collaboration with product managers.
Be a driving force behind new features — search relevance, alerts, personalisation — and technical improvements alike.
Share knowledge with the team and help raise the bar on iOS engineering practices across Immoweb.

What You Bring

Solid, hands-on experience building production iOS apps in Swift, ideally including Swift 6 and iOS 18.
Strong SwiftUI experience; comfort with @Observable and modern state management patterns.
Good understanding of Swift Concurrency (async/await); exposure to RxSwift is a plus, as parts of our codebase are mid-migration.
Familiarity with, or willingness to adopt, Point-Free's à la carte libraries (swift-dependencies, swift-sharing, swift-navigation, swift-case-paths).
Experience consuming RESTful APIs; familiarity with Moya is a plus.
A solid grasp of software architecture and Clean Architecture principles.
Basic knowledge of unit and UI testing (XCTest / Swift Testing).
Comfort working with Git and collaborative workflows (GitHub).
Excellent communication skills; you're a team player who shares knowledge openly.
English is mandatory; French or Dutch are strong assets given our Belgian market.

Nice to have

Experience with Swift Package Manager.
Familiarity with the Composable Architecture (TCA) or similar unidirectional architectures.
Experience with A/B testing and product analytics/tracking.
Experience with Bitrise or similar CI/CD tooling.
Knowledge of accessibility best practices.
Experience contributing to or consuming a design system.
Familiarity with Jira and Confluence; experience working in Scrum.

What We Offer

A friendly, quality-first engineering culture where you'll help modernise a widely-used app.
Real ownership over features used by hundreds of thousands of people every day.
Hybrid working, with the option to be based in Brussels or Bucharest.
Opportunities for growth — training, conferences, and mentorship within a full-stack squad.
The autonomy to work in the way that makes you most productive, and a say in the tools you use.

This is a saved copy of a posting published elsewhere. Postings get taken down without notice — check the employer's site before applying. mentors.coach is not the hiring party.