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Java Backend Engineer

TechBiz Global GmbH
Argentina
Tiempo completo
hace 1 día
At TechBiz Global, we are providing recruitment service to our TOP clients from our portfolio. We are currently looking for a skilled Java Backend Engineer to join one of our clients' teams. You will play a key role in building an Applicant Tracking System (ATS) integrated with REST APIs and FIX APIs. You will work closely with product managers, architects, and front-end engineers to design, develop, and optimize scalable backend services for high-performance applications.

Key Responsibilities
  • Design and implement backend services and APIs in Java (Spring Boot / Jakarta EE) for ATS functionality.
  • Develop and maintain RESTful APIs for integrations with external systems and internal services.
  • Implement and optimize FIX protocol-based APIs for financial/trading system integrations.
  • Ensure low-latency, high-availability, and secure backend architecture.
  • Write clean, maintainable, and well-documented code following industry best practices.
  • Collaborate with DevOps to deploy and monitor services in production environments (AWS, GCP, Azure, or on-prem).
  • Optimize database performance (SQL/NoSQL) and design schemas for ATS workflows.
  • Conduct code reviews, unit testing, and integration testing to maintain code quality.
  • Troubleshoot and resolve performance, scalability, and reliability issues.
  • Stay updated on emerging technologies, protocols, and best practices in API development and backend engineering.


  • Bachelor’s or Master’s degree in Computer Science, Engineering, or related field.

  • 3–5 years of professional experience** in backend development with Java.

  • Strong expertise in Spring Boot, Hibernate/JPA, and RESTful APIs.

  • Hands-on experience with FIX protocol (QuickFIX/J or similar libraries).

  • Solid knowledge of multithreading, concurrency, and low-latency system design.

  • Experience with databases (PostgreSQL, MySQL, MongoDB, Redis, etc.).

  • Proficiency in Git, CI/CD pipelines, Docker, Kubernetes.

  • Strong understanding of security principles (OAuth2, JWT, SSL, encryption).

  • Excellent problem-solving, debugging, and analytical skills.


Nice to Have

  • Experience with financial systems, trading platforms, or ATS solutions.

  • Knowledge of messaging systems (Kafka, RabbitMQ, Redpanda, Chronicle Queue, etc.).

  • Exposure to cloud services (AWS/GCP/Azure).

  • Familiarity with microservices architecture and event-driven systems.

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