Backend Engineer

Harmoney; Belgique; On-site; EUR 60,000 - 90,000; Full time

Benefits offered by this job

Company car

Mobility budget

Net allowance

Pension plan

Hospitalisation insurance

Meal vouchers

Eco vouchers

Smartphone budget

Phone subscription

32 days annual leave

Flexible remote work

Freelance collaboration

Job summary

Harmoney is seeking a Backend Engineer to design, build, and evolve cloud-native services powering our platform. You’ll work with Product and fellow engineers, owning major components from design through deployment.

You’ll help create secure APIs, optimize databases, review code, and drive performance and reliability. Fluent English and 3+ years of Java experience are essential, with Dutch and Quarkus knowledge as nice-to-haves.

Qualifications

• 3+ years of experience building enterprise applications in Java.
• Fluent in English.
• Strong experience with relational databases and SQL.
• Know how to design and build secure REST APIs.
• Enjoy real ownership and autonomy from day one.
• Enjoy solving complex technical challenges and thinking about scalability.
• Collaborative engineer who shares knowledge through code reviews.

Responsibilities

• Design, build, and maintain scalable backend services using Java.
• Develop secure REST APIs and cloud-native features.
• Translate product requirements into clean, maintainable software.
• Design and optimise database models and SQL queries.
• Perform code reviews and contribute to engineering best practices.
• Collaborate closely with Product and Engineering to deliver high-quality features.
• Leverage AI tools to improve development speed, quality, and efficiency.
• Continuously improve the performance, scalability, and reliability of our platform.

Skills

Java

REST APIs

SQL

Backend design

Code reviews

English

Ownership

Team collaboration

Tools

Quarkus

Angular

Job description

At Harmoney, you'll work on a product trusted by organizations such as Belfius, Baloise, AG Insurance, and Swiss Life. More importantly, you'll join a team that's ambitious, supportive, and genuinely enjoys building great things together. As a Backend Engineer, you'll design, build, and evolve the cloud-native services that power our platform. You'll work on complex engineering challenges, collaborate closely with Product and fellow engineers, and have the autonomy to shape scalable solutions from design through deployment.

Your impact

You’ll play a key role in building the foundation of our platform. From designing secure APIs and scalable backend services to improving performance and code quality, you’ll help create software that thousands of professionals rely on every day. You’ll also contribute to architectural decisions, code reviews, and AI-powered development workflows.

What You’ll Do

• Design, build, and maintain scalable backend services using Java
• Develop secure REST APIs and cloud-native features
• Translate product requirements into clean, maintainable software
• Design and optimise database models and SQL queries
• Perform code reviews and contribute to engineering best practices
• Collaborate closely with Product and Engineering to deliver high-quality features
• Leverage AI tools to improve development speed, quality, and efficiency
• Continuously improve the performance, scalability, and reliability of our platform

You’ll thrive in this role if you...

• Are fluent in English
• Have 3+ years of experience building enterprise applications in Java
• Have strong experience with relational databases and SQL
• Know how to design and build secure REST APIs
• Enjoy real ownership and autonomy from day one
• Enjoy solving complex technical challenges and thinking about scalability
• Are a collaborative engineer who enjoys sharing knowledge through code reviews
• Communicate clearly and enjoy working closely with teammates

Nice to have

• Fluency in Dutch is a plus
• Experience with Quarkus or similar modern Java frameworks
• Familiarity with frontend technologies such as Angular
• Experience working with cloud-native architectures or distributed systems
• Experience using AI tools to improve software development workflows

Why Harmoney?

• A flat, down-to-earth culture with approachable leadership, real ownership, and plenty of room to make an impact
• An intellectually challenging environment where you work with a modern tech stack and solve complex, real-world problems
• Become part of a warm, inclusive, and energetic team that enjoys learning from each other
• Great package: competitive salary + a wide range of benefits including company car/mobility budget, net allowance, pension plan, hospitalisation & group insurance, meal & eco vouchers, smartphone budget, phone subscription and 32 days of annual leave
• Flexible remote working based on trust, open communication and client/company/team needs
• Long-term freelance collaboration also possible