Backend Developer

AppTweak; Brussel Hoofdstad; Hybrid; EUR 60,000 - 90,000; Full time

Benefits offered by this job

Meal vouchers

Eco-vouchers

Health insurance

RTT days

Flexible hybrid work

Job summary

AppTweak is seeking a Back End Developer to join a multidisciplinary squad in Brussels. You will develop and maintain data fetch workers and databases, build APIs, and optimize data pipelines. The role offers hybrid work with 3 days/week in the office and opportunities to learn from experienced engineers.

You will work under the Engineering Manager, collaborate with senior backend/frontend engineers and designers, and contribute to scalable solutions across AWS, Docker, Kubernetes, and databases.

Qualifications

• Bachelor's or master's degree in computer science or engineering.
• 2+ years of experience building data models and optimizing queries for performance at scale.
• Knowledge of relational (PostgreSQL) and non-relational databases (MongoDB).
• Knowledge of Docker.
• Proficiency in at least one backend language (Ruby, Python, Go…).
• Building and maintaining APIs or services, writing tests, Git and code review.
• Debugging and monitoring live systems, handling incidents, and performance work beyond queries.

Responsibilities

• Architect and build scrapers and ETL pipelines ingesting data powering AppTweak.
• Architect and build APIs to expose data.
• Monitor and optimize message queue systems.
• Monitor and optimize databases.

Skills

PostgreSQL

MongoDB

Docker

AWS

Kubernetes

Git

API development

Education

CS/Engineering degree

Tools

PostgreSQL

MongoDB

Docker

AWS

Kubernetes

Git

Job description

We're looking for a motivated Back End Developer to join our team as we continue to scale.

You’ll be responsible for helping us to bring AppTweak to the next level! For that, you will work in a multi-skilled team responsible for part of the AppTweak tool and infrastructure. You will take care of the development and maintenance of data fetch workers and our databases.

Under the direct supervision of the Engineering Manager, you’ll work in a multidisciplinary squad (ASO Squad) alongside senior backend and frontend engineers and product designers. You’ll also receive support from the Backend Chapter and Backend Tech Lead. This environment offers an excellent opportunity to learn from experienced colleagues, strengthen your technical skills, and grow as an engineer.

Location: Brussels, hybrid setting (min. 3 days per week at the office).

What you'll do

As a Back-end developer, we expect you to have a first understanding of the current tech environment and database structure.

In your role, you will help us make the right decisions by understanding business requirements and translating these into strong scalable solutions.

You will also take part in the systems implementation with the rest of your team.

Your focus will be on:

• Architecture and build scrapers and ETL pipelines that ingest the data that power AppTweak;
• Architecture and build API's that make those data available;
• Monitor and optimize our message queue systems;
• Monitor and optimize our databases.

Must-have

• Bachelor or master's degree in computer science or engineering.
• 2+ years of experience working with databases, building data models and optimizing queries for performance at scale.
• Knowledge of relational (PostgreSQL) and non-relational databases (MongoDB)
• Knowledge of Docker.
• Proficiency in at least one backend language (Ruby, Python, Go…)
• Building and maintaining APIs or services, writing tests, Git and code review
• Debugging and monitoring live systems, handling incidents, and performance work beyond queries

Nice-to-have

• Experience with AWS and Kubernetes.
• Knowledge of OLAP databases (Clickhouse).
• GitHub profile or link to open source work - we'd like to see any project you're proud of (personal or professional).

Don't tick every box? We'd still like to hear from you. We hire for potential and we'll help you grow.

AppTweak welcomes applicants of every gender, age, background and identity. If you need any adjustment during the hiring process, just let us know.

[Please note you will need a Belgian valid visa/work permit to be eligible for the role].

Technologies we use

• We're mainly relying on three different languages:
  • Ruby in the backend (for APIs and crawlers).
  • Typescript in the frontend (for our React SPA).
  • Python (mainly used by our Data Science team).
• Everything is hosted on AWS and running on K8s, and we have created a robust CI system to develop and deploy our code quickly.

What's in it for you

• Grow your career with one of Belgium's top tech scale-ups.
• Competitive and optimized salary package, structured to make the most of what you earn.
• Meal vouchers and eco-vouchers.
• Complementary Health Insurance Plan.
• 12 RTT days per year, on top of regular holidays.
• Flexible, hybrid work setup.
• Opportunities for continuous learning and creative thinking.
• Quarterly team-building events and a yearly company-wide retreat.
• One volunteer day every quarter to give back to the community.
• Serious about food. From themed lunches to spontaneous kitchen moments, food is genuinely part of how we connect at AppTweak.

Who are we?

At AppTweak, we are a team of more than 120 people, spread across Brussels, San Francisco, London, Tokyo, Seoul, Bengaluru, Ho Chi Minh, and Berlin.

We build the platform that helps mobile leaders win in the app stores. More than 2,000 customers, like Uber, Zynga, and The North Face trust us to do that.

We started in Brussels in 2014. It began with a small team and a simple bet: the best ASO insights come from people who go deeper into app store data than anyone else.

We move fast, we speak up and support each other to do better. We keep learning, even on the days we are already good at our jobs. None of that happens by accident, but because people here take ownership. They show up for each other too, across offices and timezones.

If that sounds like the kind of place you want to grow, we would love to hear from you!

At AppTweak, our first spoken language is English, from our Belgian HQ, to our teams all over the world.

To ensure a smooth review process, please submit your application in English.