Backend Engineer: APIs & Data Pipelines (Hybrid)

AppTweak; Brussel Hoofdstad; Hybrid; EUR 55,000 - 75,000; Full time

Benefits offered by this job

Meal vouchers

Health insurance

RTT days

Flexible hybrid

Learning opportunities

Team events

Volunteer day

Job summary

AppTweak is seeking a motivated Back End Developer to scale our data platform and infrastructure in Brussels. You’ll work in a multidisciplinary squad, building data fetch workers, ETL pipelines, and APIs, while optimizing DBs and message queues. Hybrid work: at least 3 days per week in the office.

You’ll collaborate with frontend engineers, data scientists, and the Backend Chapter to translate business needs into robust, scalable solutions and own meaningful parts of the system.

Qualifications

• Bachelor or master's degree in computer science or engineering.
• 2+ years experience with databases, 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 that ingest the data that power AppTweak.
• Architecture and build APIs that make those data available.
• Monitor and optimize our message queue systems.
• Monitor and optimize our databases.

Skills

Databases experience

PostgreSQL

MongoDB

Docker

Backend language (Ruby/Python/Go)

APIs

Debugging & monitoring

Git/CI

Education

Bachelor's or Master's in CS/Engineering

Tools

AWS

Kubernetes

Clickhouse

GitHub

Job description

AppTweak is seeking a motivated Back End Developer to scale our data platform and infrastructure in Brussels. You’ll work in a multidisciplinary squad, building data fetch workers, ETL pipelines, and APIs, while optimizing DBs and message queues. Hybrid work: at least 3 days per week in the office.

You’ll collaborate with frontend engineers, data scientists, and the Backend Chapter to translate business needs into robust, scalable solutions and own meaningful parts of the system.