Software Engineer III

Overview

As an Engineer in GMNST, you will contribute to the card transaction platform by building core features on a distributed, hybrid-cloud system. You’ll work in an agile team, writing code, tests, and APIs while embracing innovative approaches. The role centers on high-performance, low-latency fintech software that supports 24/7 global transactions. You’ll collaborate across locations to explore new technologies and analyze stakeholder needs, helping shape secure, scalable payments infrastructure.

Responsibilities

• Build core features for the card transaction system on a distributed, hybrid-cloud platform
• Contribute to agile development, writing code, unit tests, and working with API specs and automation
• Develop using Java technologies (Vertx, Spring MVC, Spring Data, Spring Boot) and RESTful microservices
• Foster innovation and experimentation within the team and culture
• Collaborate with peer technology and development teams across locations
• Identify opportunities to adopt new technologies
• Engage with stakeholders to understand and analyze requirements

Key requirements

• Computer Science, or equivalent degree or industry experience
• Extensive software development experience in a professional environment
• Strong OOP concepts, concurrency, exception handling
• Data structures and algorithms, OS fundamentals, Advanced Java concepts
• Proficiency in Java and Go; experience building high-performance systems
• Hands-on experience with distributed microservices and service mesh ecosystems (Envoy, Linkerd, Istio)
• Experience with cloud-native design and platforms (Docker, Kubernetes, OpenShift)
• Experience with NoSQL and distributed messaging (Redis, Kafka, Couchbase, Cassandra)
• CI/CD tools experience (Jenkins, GitHub)
• DevOps and Scrum experience
• Strong communication skills
• Willingness to learn and explore new technologies

• strong communication
• collaboration across teams
• problem solving
• Java
• Go
• Vertx

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