Level: Experienced

Job Field: Web, Front End, Back End

Employment Type: Full Time

Contract Type: Permanent employment

Salary: from 70.000 € Gross/Year

Location: Vienna

Working Model: Full Remote, Hybrid

Job Summary

In this role, you will develop a high-performance browser-based application for POS and payment environments using pure JavaScript and actively contribute to the re-engineering of microservices.

Job Technologies

Your role in the team

Build and evolve a high-performance, browser-based core application used in real POS and payment environments.
Develop with pure JavaScript - no frameworks, maximum control, full understanding of browser internals.
Work closely with system architects, product managers, and a hands-on technical leadership group.
Contribute to an ongoing re-engineering initiative (microservices on Node.js, with Go planned down the line).
Participate in architecture discussions, code reviews, and deep-dive technical workshops.
Drive performance, reliability and maintainability across the application.
Grow into architecture or technical leadership if this aligns with your ambitions.

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Our expectations of you

Qualifications

The ability to build performant applications without relying on frameworks.
A clean, structured coding style and a strong sense of software quality.
A proactive, ownership-driven mindset - you like to take responsibility, not wait for instructions.
Exposure to POS, payment, IoT or hardware-connected software is nice to have.
Understanding of binary or non-JSON communication formats is nice to have.
Interest in re-engineering, system design, scalability, and distributed architectures is nice to have.

Experience

Strong, in-depth experience with vanilla JavaScript and native browser APIs (DOM, Fetch, WebSocket, Storage, etc.).
Experience with Git workflows, testing methodologies, and collaborative review processes.
Experience with Node.js, Go or C (microservices, embedded systems, device-level development) is nice to have.

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