Senior Software Engineer, Java

Johannesburg, GautengFull-time2026-11-02

Core

Designing and developing mission-critical Java applications for Mobile Network Operators (MNOs) across the full software development lifecycle.

Role type

Senior Software Engineer (Java)

Builds

Mission-critical applications for MNOs

Domain

Telecom / Mobile Marketing Automation

Deliverable

production ML models | product features

Required skills

Java, Spring Framework, JPA/Hibernate, RabbitMQ, Kafka, HTTP web services, SQL, RDBMS, Maven, Git, Continuous Delivery

Preferred skills

NoSQL databases (Redis, Elasticsearch, Couchbase), Caching technologies (Hazelcast, EhCache), Microservices architectures

Responsibilities

Write well-designed, testable, efficient software modules; Ensure designs comply with specifications; Prepare and produce releases of software components; Provide support for production systems; Create/review design documentation and test plans; Investigate alternatives and technologies for architectural review; Support and coach junior developers

Seniority

Senior, hands-on IC

About Upstream

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.