Flávio Lehmann

Achievements: - Reduced incident detection and response time by ~70% by designing and implementing a full observability stack with Prometheus and Grafana, enabling proactive alerting and near-zero downtime for client-facing services. - Reduced partner integration setup time from days to hours by building a containerized API simulator that replicated competitor APIs, enabling integration testing with zero code changes. - Increased manual transaction traffic by 5% by designing a hybrid data synchronization architecture combining asynchronous batch jobs and RabbitMQ event-driven updates to maintain accurate federal bank agency data at scale. Context: Continued working within the Identity Verification platform, focusing on improving system reliability, observability, and scalability for high-volume partner integrations. Technologies: - Java / Spring Boot - PostgreSQL - RabbitMQ - Docker / Kubernetes - Grafana / Prometheus / Alertmanager - PagerDuty / Incidents.io - REST APIs - CI/CD pipelines - Automated testing (unit / integration) Activities: - Designed and implemented backend services supporting high-volume identity verification workflows. - Improved system observability by defining dashboards, alerts, and monitoring strategies for critical services. - Contributed to architectural improvements to increase platform reliability and scalability. - Collaborated with cross-functional teams to troubleshoot incidents and deliver platform enhancements.

Achievements: - Reduced partner customer onboarding time from 2–3 days to under 5 minutes by building production-critical identity verification services, significantly improving registration throughput and partner integration efficiency. Context: Worked in Trustly’s Identity Verification team, building and maintaining partner-facing APIs responsible for customer identity and account verification during onboarding flows. Technologies: - Java / Spring Boot - PostgreSQL - RabbitMQ - Docker / Kubernetes - Grafana / Prometheus / Alertmanager - PagerDuty / Incidents.io - REST APIs - CI/CD pipelines - Automated testing (unit / integration) Activities: - Developed and maintained backend services and REST APIs for Trustly’s Identity Verification platform. - Implemented partner-facing endpoints used for customer identity and account verification during onboarding flows. - Supported production services through monitoring dashboards and operational alerts. - Collaborated with engineers and product teams to deliver new verification features.

Achievements: - Helped deliver a critical project milestone by coordinating 12 trainee developers during an internal training program, enabling the team to complete the delivery on time and secure the renewal of the client contract. - Expanded the company’s talent pipeline by proposing and organizing an additional training cohort in a neighboring city, resulting in the hiring of 4 new interns. Context: Continued working on large-scale workforce and scheduling platforms for military clients while also contributing to internal initiatives related to developer training and team growth. Technologies: - Java / Spring - Angular - PostgreSQL / Oracle / MySQL - REST APIs - Docker - Jenkins (CI/CD) - Automated testing Activities: - Designed and implemented backend and frontend features for enterprise workforce management systems. - Contributed to architecture discussions and technical decisions across projects. - Mentored interns and trainees participating in internal engineering training programs. - Collaborated with cross-team stakeholders to deliver client requirements and platform improvements.

Achievements: - Increased unit test reliability by introducing mutation testing with PiTest, raising average test coverage across services from ~80% to ~95% and improving overall test effectiveness. Context: Worked on enterprise systems for military clients focused on workforce and schedule management, integrating data from multiple legacy systems across distributed environments. Technologies: - Java / Spring - Angular - PostgreSQL / Oracle / MySQL - REST APIs - Docker - Jenkins (CI/CD) - Automated testing Activities: - Developed backend services and frontend features for enterprise workforce management systems. - Integrated data from multiple legacy systems used by distributed client environments. - Authored scripts to migrate and standardize legacy databases into modern schemas. - Collaborated with engineering teams to deliver platform improvements and new client features.

Achievements: - Automated production order flow for a local factory by designing and implementing a service order management system, eliminating manual coordination and saving ~30 minutes per day for employees on the production line. - Stabilized and organized a disorganized student development team by introducing Trello-based task management and agile practices, improving delivery visibility and increasing on-time task completion to 90%. Context: Worked on real-world software projects for local businesses through a university extension program, applying classroom knowledge to develop practical solutions for operational and management workflows. Technologies: - Java / Spring - Angular - MySQL - REST APIs - Docker - Automated testing Activities: - Developed backend and frontend features for business management systems used by local companies. - Collaborated with a small development team to design and deliver client-facing solutions. - Participated in requirement discussions and translated business needs into software features.