Senior Java Back-end Developer

Description

If you are a technical leader who serves as a reference in software engineering, enjoy untangling complex architectural challenges, work with cutting-edge technologies, and guide a highly engaged team toward excellence, this is the place for you! Paytrack is a pioneering *scale-up* delivering outstanding results, growing at an accelerated pace within a dynamic ecosystem offering ample room to structure, create, test, adapt, and expand. Here, you’ll have real autonomy to propose new solutions, receive broad recognition, and leave a significant mark on our history—and your own career journey. Our ambitious goals for the coming years depend heavily on the maturity of our software engineering, particularly regarding the resilience, scalability, and security of our financial and travel integrations. As a **Senior Java Back-end Developer**, you will serve as the technical reference for one of our *squads* focused on the corporate travel journey, designing and evolving the core logical engines that power our business. ### **About the Area and the Team** The Technology and R&D team at Paytrack is the heart of our SaaS software. We don’t just build CRUD applications—we build highly available, concurrent distributed systems that integrate complex travel policies, real-time reservation flows, payment gateways, financial back-office systems, and API-based connections with major global partners. We operate in a modern, 100% cloud-native, microservices-oriented ecosystem where technical discussions are mature, horizontal, and performance-focused. ### **️ Our Tech Stack** * **Backend:** Java 21 (Spring Boot and Quarkus) * **Cloud:** AWS (100% Cloud) * **Databases:** PostgreSQL, MySQL, and NoSQL (Redis/MongoDB) ### **What You’ll Do (Responsibilities)** In this Senior-level role, you’ll share responsibility for the architectural evolution and technical quality of the *squad*: * **Architecture and Product Evolution:** Design high-performance, scalable, and secure product solutions; lead root-cause investigation and definitive resolution of complex production issues. * **Technical Excellence and Best Practices:** Ensure and enforce clean code (Clean Code), highly testable, resilient, and maintainable back-end code across the team—strictly applying SOLID principles. * **Mentoring and Code Review:** Lead the team’s code reviews, providing mature feedback to elevate the technical bar for junior and mid-level developers, acting as a mentor to the team. * **Leadership in Technical Discussions:** Lead logical and infrastructure-related discussions, proposing design patterns (*Design Patterns*), messaging strategies, data modeling approaches, and database query optimization techniques. * **Integration and System-Wide Perspective:** Ensure efficient and secure integration between internal and external systems; communicate directly with customer support, support channels, and business partner areas to anticipate technical impacts. * **Commercial/Agile Governance:** Actively participate in and guide team rituals (*Dailys, Retrospectives, Sprint Reviews*) from the perspective of delivery predictability and technical debt mitigation. ### **The Profile We’re Looking For** We seek a senior professional with a problem-solving mindset, strong systems thinking, and alignment with our values: * **Macro Vision and Investigative Ability:** Skill in addressing the root cause of complex architectural problems while understanding how changes impact the entire ecosystem. * **Ownership Mindset and Accountability:** Absolute commitment to the quality, stability, and security of deliverables deployed to customer environments. * **Proximity-Based Technical Leadership:** Passion for sharing knowledge, explaining the "why" behind architectural decisions, and supporting the team’s technical growth. * **Embracing Change and Resilience:** Flexibility to technically guide the team through the fast-paced dynamics of a rapidly growing company continuously evolving its products. ### **✔️ Requirements** **Essential (What You Must Have):** * Proven, hands-on experience building robust back-end systems using **Java** (modern versions such as Java 17 or 21), with deep expertise in concurrency, *streams*, memory optimization, and design patterns. * Strong experience with the **Spring Boot** ecosystem (Web, Data, Security) and modern, cloud-native high-performance frameworks such as **Quarkus**. * Advanced proficiency in persistence and ORM using **Hibernate / JPA**, with emphasis on performance optimization, transaction control, and query *tuning*. * Solid experience designing, architecting, and securing **RESTful APIs** in distributed microservices environments. * In-depth knowledge of relational databases (**PostgreSQL** or **MySQL**) including writing complex queries, indexing, and modeling best practices, plus experience with NoSQL solutions (**MongoDB** or **Redis**). * Full mastery of automated testing strategy and implementation (unit, integration, and load tests) using **JUnit** and **Mockito**. * Demonstrated experience in high-performance Agile environments and familiarity with container tools (**Docker**), version control with **Git**, and CI/CD pipeline concepts. **Nice-to-Have (What Sets You Apart):** * Practical experience with event-driven architectures using large-scale messaging and streaming tools such as **Kafka** or **RabbitMQ**. * Solid knowledge of advanced authentication, authorization, and API protection protocols (**JWT, OAuth2, Mutual TLS**). * Experience or knowledge of **AWS** cloud infrastructure services (e.g., ECS, Lambda, RDS, S3, CloudWatch). * Sharing of **GitHub** repositories or technical articles demonstrating your contributions and passion for the engineering community. ### **What You’ll Find at Paytrack** * **Ownership and Active Voice:** Real autonomy to propose new architectural directions, approve cutting-edge tools, decide on structural refactoring, and directly influence product strategy. * **Strong Engineering Culture:** A horizontal culture that eliminates bureaucracy, encourages innovation, and gives you direct exposure to modern tech stacks (Java 21 + Quarkus + 100% Cloud AWS). * **High-Impact Opportunity:** Design and sustain the engine processing millions in corporate transactions for Brazil’s largest companies. * **Inclusion and Diversity:** We are a creative and diverse scale-up. All our positions are inclusive and open to people with disabilities (PCD)—your uniqueness adds technical value to our team! ### **Ready to Be the Technical Reference Behind a Market-Leading Platform?** If you bring senior-level technical expertise, passion for clean architecture, and want to accelerate engineering outcomes at a major tech company, you belong with us. **Apply now and help shape history at Paytrack!**