Senior Software Engineer, Java
UpstreamGerakas Municipal Unit, Attica, Greece
Posted December 8, 2025
Full Time
About the Company
Upstream is a global mobile‑technology leader that delivers end‑to‑end digital solutions to more than 1.2 billion consumers, helping businesses expand their digital reach and optimize the customer experience. The company specializes in performance‑driven, omnichannel marketing, combining data‑rich engineering with creative expertise to create seamless digital journeys that increase engagement and revenue. Upstream’s portfolio includes digital subscriptions, operator and carrier‑billing protection, mobile commerce, cybersecurity, ad‑fraud prevention, and digital acquisition services, all tailored for fast‑growing markets. With partnerships across telcos, insurance, education, FMCG, and retail in over 45 countries—including Latin America, Africa, the Middle East, and Southeast Asia—Upstream distinguishes itself by marrying deep telecom integration with cutting‑edge digital strategy in emerging markets.
Job Description
We are a leader in mobile technology, providing innovative solutions to 1.2 billion consumers. We help businesses grow their digital reach & toolkits to optimize user experience, increase engagement, attract new customers, and boost their revenues.
Requirements
- BSc/MSc in Computer Science, Software Engineering or equivalent
- 5+ 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
- Experience with asynchronous messaging technologies (e.g. RabbitMQ, Kafka)
- Experience designing and developing HTTP web services
- Excellent knowledge of SQL and RDBMS concepts
- Working knowledge of Maven, Git and Continuous Delivery principles
Benefits
- Competitive base salary
- Benefits directly dependent on the candidate’s qualifications and skills
