We are looking for a Senior Java Developer to work on-site on high-criticality, high-performance, and business-impact projects, with a focus on credit systems, financial risk, and Artificial Intelligence-based solutions. The professional will work in a demanding, results-oriented environment with strong technical responsibility and close interaction with business areas. We seek someone with solid software engineering education, analytical ability, systemic vision, and maturity to participate in strategic architectural decisions. **On a day-to-day basis:** * Develop and maintain robust, scalable, and secure backend systems focused on credit and financial risk * Write clean, testable, and sustainable code, with emphasis on performance, resilience, and maintainability * Actively participate in technical and architectural decisions, considering long-term impact * Work within agile squads, ensuring continuous delivery of business value * Integrate Artificial Intelligence solutions into existing systems * Handle sensitive financial data, ensuring consistency, traceability, and security * Assume technical ownership of deliverables, adopting a customer-focused, owner mindset **What we expect from you:** * Solid experience with Java 8 or later * Strong command of Object-Oriented Programming (OOP) * Consistent application of SOLID principles and Design Patterns * Experience with microservices architecture * Development of RESTful APIs * Experience with messaging systems (Kafka and/or RabbitMQ) * Use of distributed caching (Redis) * Code versioning with Git * Experience with CI/CD pipelines (Jenkins, GitLab CI or similar) * Automated testing practices (JUnit, TDD) * Knowledge of application security (OWASP Top 10) * Advanced SQL knowledge * Experience with PostgreSQL and Oracle databases * Data modeling for financial systems * Experience handling large volumes of data and highly concurrent environments * Practical experience with AWS services, including: * EC2, RDS, S3, Lambda * SNS, SQS * CloudWatch * Infrastructure-as-Code knowledge is considered a plus * Desired experience in credit systems, including: * Credit limits * Exposure * Collateral * Leverage * Knowledge of financial risk management * Experience in the equity markets, derivatives, or financial products * Understanding of pre-trade and post-trade workflows * Ability to translate complex financial business rules into technical solutions * Practical experience applying Artificial Intelligence in corporate environments * Using AI for process automation, data analysis, decision support, and development assistance * Integrating AI solutions with Java backend systems * Python for integration with AI solutions * Consuming Large Language Model (LLM) APIs * Using AI orchestration frameworks (e.g., LangChain or similar) * Experience with vector databases (FAISS, OpenSearch, Pinecone or similar) * Knowledge of Prompt Engineering * Using AI to enhance productivity and code quality **Note:** We are not seeking an academic or research-oriented AI profile, but rather professionals who apply AI practically and integrally within the business context. Differentiators * Java and/or AWS certifications * Experience with credit models or scoring systems * Knowledge of machine learning applied to financial risk * Experience in highly critical, fault-intolerant financial environments * Experience with event-driven architecture **Benefits:** * Profit and Results Sharing Program (PLR); * Meal and Food Allowance; * Health Insurance; * Dental Insurance; * Daycare/Babysitter Allowance; * Transportation Voucher; * WellHub; * TotalPass; * Personal Support Program (EAP); * Optional plans such as Private Pension and Life Insurance; * Pharmacy Discount; * Nutrition Program; * Pregnancy Program; * Extended Maternity and Paternity Leave – Citizen Company.