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Junior Data Engineer, Fintech

Optasia

Athens, Attica, Greece Hybrid permanent

Posted: March 23, 2026

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Quick Summary

We are seeking a Junior Data Engineer to join our team and be part of a dynamic and innovative environment where we can deliver innovative solutions in an exciting and fast-paced industry.

Job Description

Optasia is a fully enabled B2B2X financial technology platform covering scoring, financial decisioning, disbursement and collection. We are committed to enabling financial inclusion for all. We are changing the world our way.

We are seeking for enthusiastic professionals, with energy, who are results driven and have can-do attitude, who want to be part of a team of likeminded individuals who are delivering solutions in an innovative and exciting environment. Data is at the core of Optasia’s growth plan, and the Data Engineering team is a significant contributor to data-driven automated decision making. We are currently leveraging and ingesting data from multiple sources from MNOs into our large-scale big data clusters and we are in the process of optimizing and modernizing our processes and infrastructure as the company scales.

We are looking for a Junior Data Engineer to join our growing Data Engineering team. As part of our team, you will be able to design and implement highly scalable end-to-end batch and streaming data pipelines and contribute to Optasia’s success.

What you will do

• Work closely with Data Architects, ML engineers and Data Analysts for the design, delivery and support of the company’s ETL and ML pipelines
• Develop and maintain our core libraries for batch processing and ingestion of large volumes of data
• Design and develop new processes for real-time streaming of data from multiple sources
• Develop and maintain the fast, accurate and efficient injection of data to the big data infrastructure
• Experiment with and adopt novel data engineering design patterns and technologies

What you will bring

• Bachelor's or Master's degree in Computer Science or Informatics
• Knowledge of data modeling, mining and warehousing techniques
• Good knowledge of one or programming languages, preferably Java, Scala or Python
• Good knowledge of SQL
• Strong analytical skills and attention to detail
• Passion for learning new technologies and eagerness to collaborate with other creative minds

Will be considered a plus

• Hands-on experience with Big Data technologies (Apache Spark, YARN, HDFS, MapReduce)
• Hands-on experience with NoSQL databases
• Experience on mathematical modelling, algorithms development, and machine learning

Why you should apply
What we offer:
👟 Flexible hybrid working
💸 Competitive remuneration package
🏝 Extra day off on your birthday
💰 Performance-based bonus scheme
👩🏽‍⚕️ Comprehensive private healthcare insurance
📲 💻 All the tech gear you need to work smart

Optasia’s Perks:
🎌 Be a part of a multicultural working environment
🎯 Meet a very unique and promising business and industry
🌌 🌠 Gain insights for tomorrow market’s foreground
🎓 A solid career path within our working family is ready for you
📚 Continuous training and access to online training platforms
🥳 CSR activities and festive events within any possible occasion
🍜 Enjoy comfortable open space restaurant with varied meal options every day
🎾 🧘‍️ Wellbeing activities access such as free on-site yoga classes, plus available squash court on our premises

Optasia’s Values 🌟

#1 Drive to Thrive: Fully dedicated to evolving. We welcome all challenges and learning opportunities.
#2 Customer-First Mindset: We go above and beyond to meet our partners’ and clients’ expectations.
#3 Bridge the Gap: Knowledge is shared, information is exchanged and every opinion counts.
#4 Go-Getter Spirit: We are results oriented. We identify any shortcomings that hold us back and step up to do what’s needed.
#5 Together we will do it: We are committed to supporting one another and to understanding and respecting different perspectives, as we aim to reach our common goals.

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