Software Engineer, Java

Upstream

Gerakas, Attica, Greece Hybrid permanent

Posted: January 26, 2026

Required Skills

Job Description

The company

We are a leader in mobile technology, providing innovative solutions to 1.2 billion consumers. In an ever-increasing digital world we help businesses grow their digital reach & toolkits to optimize user experience, increase engagement, attract new customers and boost their revenues.

Think of performance marketing but on steroids as our top-notch marketeers and engineers build digital journeys through an omnichannel marketing approach like no other. Currently we work with the biggest names in Telco, Insurance, Education, FMCGs and Retail in over 45 countries in Latin America, Africa, the Middle East and South-East Asia.

The role

We are looking for an enthusiastic Software Engineer, Java, to join our Software Development team in Athens, Greece.

You will be part of a very competent team that works on mission – critical applications, contributing to all phases of the development process. You will be responsible for Java application development, supporting business objectives while providing expertise in the full software development lifecycle, from concept and design to testing.

Your main responsibilities will be:

• Develop on high-volume, low-latency applications for mission-critical systems, delivering high-availability and performance.
• Write well-designed, testable, efficient software modules.
• Ensure designs comply with specifications and that specifications cover all needed aspects of the implementation.
• Create/review design documentation and provide feedback on test plans.

Requirements:
• BSc/MSc in Computer Science, Software Engineering or equivalent.
• 3+ years of full time professional experience in designing and developing applications using the Java ecosystem.
• Solid background in Object Oriented Analysis and Design.
• Experience with popular Java frameworks and technologies such as Spring Framework, JPA/Hibernate, JEE.
• Good knowledge of SQL and RDBMS concepts.
• Experience with HTTP APIs.
• Basic understanding of concurrency concepts.
• Working knowledge of Maven, Git and CI/CD principles.

Experience in the following will be extra appreciated:

• Asynchronous messaging technologies, such as RabbitMQ, Kafka.
• Horizontally scalable, distributed, microservices architectures.
• NoSQL databases such as Redis, Elasticsearch.
• Caching technologies, such as Hazelcast, EhCache.

You will be an excellent fit for our team if you are:

• Strong team player with good communication skills.
• Eager to work with leading-edge technologies.
• Analytical thinker with attention to detail.
• Reliable and dedicated professional with clear thinking and strong attention to detail.
• Able to multitask and thrive in a dynamic environment as well as balance and prioritize activities to ensure critical items are addressed.

Benefits:
We offer a competitive base salary and benefits, directly dependent on the candidate’s qualifications and skills. The real excitement comes from working closely with a dynamic, smart, agile and highly motivated team in a competitive and fast paced environment.

Upstream is an equal opportunity employer. The Company does not discriminate on the basis of race, colour, creed, pregnancy, religion, gender, national origin, age, disability, marital, or any other legally protected status. The Company also makes reasonable accommodations for disabled employees. Finally, the Company prohibits the harassment of any individual based on their protected status. This policy applies to all areas of personnel actions including recruitment, hiring, training, promotion, compensation, benefits, transfer, and social and recreational programs.

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