Middle Java Engineer

This is us At Avenga, we believe that human creativity empowers technology that matters. Operating globally, our 6000+ specialists provide a full spectrum of services, including business and tech advisory, enterprise solutions, CX, UX and Ul design, managed services, product development, and software development. This is the job In Argentina within the fintech industry, we are actively seeking a Middle Java Backend Developer to strengthen our team dedicated to mission-critical distributed systems. You will be responsible for building robust, scalable, and observable platforms designed to handle high transaction volumes (High TPS) and demanding performance standards. This is you 3+ years of professional experience in backend development with Java and working with production distributed systems of high criticality. Advanced proficiency in Java (LTS versions 11, 17, 21) and modern features like Streams, Optional, Records, and Virtual Threads. Strong expertise in Spring Boot (3.x), including Spring WebFlux, Spring Data, and Spring Security. Deep knowledge of Clean Code, SOLID, Design Patterns, and Hexagonal Architectures / DDD. Proven experience with relational databases (PostgreSQL, Oracle, MySQL) and NoSQL databases (MongoDB, Redis, Cassandra). Solid experience with Apache Kafka (partitioning, exactly-once semantics, Avro/Protobuf) and MQ brokers (IBM MQ, RabbitMQ). Expertise in resilience patterns (Circuit Breaker, Bulkhead, Rate Limiting) and solution design for high availability. Proven ability to perform JVM tuning (GC, heap, threads) and optimize systems for high throughput and low latency. Advanced troubleshooting skills in production (thread/heap dumps, GC logs, concurrency issues). Nice-to-have skills: Experience with Docker, Kubernetes, and OpenShift. Familiarity with CI/CD pipelines (Jenkins, GitLab CI, ArgoCD). Knowledge of Cloud platforms (AWS, Azure, GCP) and cloud-native patterns. Advanced testing skills: JUnit 5, Testcontainers, contract testing (Pact), or mutation testing. Experience in the financial or banking sector. This is your role Take full ownership of requirements to analyze, design, and deliver end-to-end development independently. Build and operate systems with high transactions per second (TPS), performing load and stress testing (JMeter, Gatling, k6). Implement comprehensive observability using Micrometer, Prometheus, Grafana, and OpenTelemetry. Diagnose and resolve complex incidents in distributed systems by correlating logs, metrics, and traces. Proactively identify technical improvements, manage technical debt, and identify optimization opportunities. Mentor junior developers while working collaboratively within agile methodologies (Scrum/Kanban). At Avenga, everyone matters. We provide equal opportunities in recruitment, career development, and leadership, regardless of race, ethnicity, gender identity, sexual orientation, disability, age, religion, or any other characteristic. We are committed to fostering a work environment where our diverse community of employees, candidates, and business partners actively shapes our growth. By bringing together people from different backgrounds and experiences, we build a workplace where everyone feels free to be themselves while honoring the boundaries of others. Apply To This Job