Junior Software Development Engineer in Test

Company

Onum is a data optimization and analytics company based in Madrid. We specialize in real-time data analysis to enable rapid decision-making regarding cybersecurity, network performance, and infrastructure management. Onum helps you optimize your data analytics costs by reducing data, avoiding vendor lock-in, and aligning the value of each dataset with actions taken.

About the Role

As a Junior Software Development Engineer in Test (SDET) at Onum, you'll play a key role in ensuring the quality of our analytics and optimization platform. You'll be part of a cross-functional engineering team working closely with developers, product managers, and QA engineers to execute test cases, build test automation, and contribute to the reliability and quality of our product.

This is an ideal role for someone early in their career with a strong desire to learn, grow technically, and make a real impact on the quality of our software systems.

Responsibilities

Testing & Automation Support :

• Write and maintain basic automated test scripts using existing testing frameworks.
• Execute manual and automated test cases across APIs, UI, and data pipelines.
• Assist in identifying, documenting, and tracking defects, working with developers to understand and reproduce issues.
• Participate in testing activities throughout the software development lifecycle, including regression and exploratory testing.

Learning & Development :

Collaboration :

Process Contribution :

Qualifications

Nice to Have

Our Values

Own it : We take full ownership from input to outcome, lead by doing and following through, and hold ourselves accountable by listening, learning, and stepping up when things go wrong.

No Mask : We speak clearly, directly, and respectfully, stay humble by learning from our mistakes, and build trust through radical clarity.

United : We collaborate fluidly across functions and teams, lift each other up by sharing the load, and genuinely enjoy working together.

Move Boldly : We stay curious, sharp, and technically bold, learning in motion, challenging the status quo with intention, and focusing our talent on solving the highest-impact problems.