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.

Requirements

- 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.

Highlights

Sao Paulo, Brazil
Hybrid / remote work format