Senior Java Developer

The company
Upstream, the leading mobile technology company, provides innovative solutions that offer seamless and secure mobile Internet access to 1.2 billion consumers in high growth markets. Upstream’s Zero-D service provides free access to the internet essentials to 250 million users in Latin America and Africa even when they have run out of data. Its award-winning security platform, Secure-D, in 2019 alone, processed over 1.7 billion mobile transactions, detecting and blocking over 98,000 malicious apps in 20 countries. Upstream’s all-in-one digital marketing platform, One-D, simplifies the digital user acquisition journey by managing the entire recruitment process, including partners and digital marketing channels, and safeguards mobile subscribers against all fraudulent activity. Its team counts 330 people of over 25 nationalities, working from nine offices around the globe. Upstream works with more than 60 mobile operators in over 45 countries in Latin America, Africa, the Middle East and SE Asia.

The role
We are looking for an enthusiastic Senior Java Developer to join our Software Development team in Athens, Greece.
As a Senior Java Developer you will be part of a very competent team that works on mission – critical applications contributing in all phases of the development process. You will be responsible for Java application development, supporting business objectives while providing expertise in full software development lifecycle, from concept and design, to testing.

Your main responsibilities will be:

• Write well designed, testable, efficient software modules.
• Ensure designs are in compliance with specifications and that specifications cover all needed aspects of the implementation.
• Prepare and produce releases of software components.
• Provide support for production systems.
• Create/ review design documentation and provide feedback on test plans.
• Support continuous improvement by investigating alternatives and technologies and presenting these for architectural review.
• Support and coach junior developers.

• BSc/MSc in Computer Science, Engineering or equivalent.
• 5+ years of full time professional Java Development experience is required.
• Hands on experience in designing and developing applications using Java platforms.
• 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. JMS).
• Experience designing and developing HTTP web services.
• Excellent knowledge of SQL.
• Working knowledge of Maven, Git and Continuous Delivery principles.

• Apache Camel
• RabbitMQ, Kafka
• Hazelcast, EhCache
• High-availability clustering

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

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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Upstream is an equal opportunity employer. The Company does not discriminate on the basis of race, color, 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.