Software Engineer, Java
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Before you apply
LocationGerakas, Attica, Greece
Typefull-time
SeniorityMid
Experience3+ yrs
DepartmentEngineering
Company size51–200 people
PostedMay 26, 2026 · 5mo ago
Verified live2d ago
May no longer be actively hiring
Posted by the company on May 26, 202646% of this company's open roles have been listed for 90+ days
At a glanceSummarised by Seekless from the posting.
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
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
Experience with asynchronous messaging technologies, such as RabbitMQ, Kafka
Experience with horizontally scalable, distributed, microservices architectures
Experience with NoSQL databases such as Redis, Elasticsearch
Experience with caching technologies, such as Hazelcast, EhCache
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.
The Company prohibits the harassment of any individual based on their protected status.
Skills
Java
Spring Framework
JPA
Hibernate
JEE
SQL
RDBMS
HTTP
Maven
Git
CI/CD
RabbitMQ
Kafka
Redis
Elasticsearch
Hazelcast
EhCache
The company
Upstream is a global leader in mobile marketing automation and digital service innovation, enabling Mobile Network Operators (MNOs) and brands to grow revenue, improve customer engagement and succeed in the digital economy. With over two decades of experience and operations spanning 45+ markets across Africa, Latin America, Asia, Europe, and the Middle East, we are a trusted partner to more than 60 MNOs worldwide.
Headquartered in Athens, Greece, and with regional hubs in London, Dubai, Johannesburg, Lagos, São Paulo and Rio de Janeiro, Upstream combines global expertise with deep local insight. Our end-to-end approach encompasses strategy, creative development, technical deployment, campaign execution, and ongoing optimization, ensuring seamless, scalable, and performance-driven service delivery.
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.
Responsibilities
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.
Nice to have
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.
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Legal
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.