Aivaras Šaltanovas

• Responsible for implementation and maintenance of AWS cloud infrastructure, built from scratch using AWS CDK, supporting a multi-environment setup. • Designed a flexible, domain-agnostic entity model for ordering and booking flows across retail, service, and booking-based businesses. Aimed for future flexibility needs, avoiding locking the system into a rigid product/variant structure. • Implementing the full ordering lifecycle flow, covering order confirmation, placement, completion, receipt generation, and time-based booking logic. • Stepping beyond backend work to build server-rendered UI using Go templates, turning Figma designs into simple yet effective views with a mix of Bootstrap, custom CSS and plain JS. Technologies: Go, AWS CDK, PostgreSQL, sqlc, Bootstrap, Github Workflows

• Joined a newly formed team building a modern event-driven payment processing platform (Visa/Mastercard-like) to process transactions between acquirers and issuers. • Owned the full design and end-to-end implementation of the team’s core settlement process, covering settlement creation, initiation, and reporting. • The settlement process was built to operate within the platform’s event-driven distributed architecture (Kafka-based), consuming & producing events, as well as scheduling time-based triggers for executing settlement actions. • Practiced TDD, maintaining >90% test coverage. Contributed to a strong testing culture by developing integration-rich tests supported by Testcontainers, WireMock, and LocalStack. • Presented new product capabilities during biweekly demos, clearly explaining its functionality and impact to both technical and non-technical stakeholders. Technologies: Kotlin, Ktor, Kafka, CockroachDB, jOOQ, Liquibase, Testcontainers, WireMock, Localstack, GitLab CI/CD, Kubernetes

• Architected a robust API from the scratch, seamlessly integrating with various eCommerce platforms, including Ecwid, Mozello, and others. The Strategy pattern became my biggest friend in dealing with different platform behaviors in a clean and maintainable way. • Tackled many common backend challenges, such as race conditions, idempotent operations, and backward-compatible API and database changes. Notably led a complex backward-compatible data migration, introducing inheritance mapping and splitting a legacy table into multiple subtype tables without downtime or data loss. • Brought a zero-tested production service under control by raising test coverage to ~80%. • Led migrations of all team repositories from Bitbucket to GitLab and backend services from AWS ECS to Kubernetes, ensuring zero downtime and no disruption to existing workflows. • Took the lead in crafting comprehensive developer documentation for kevin.'s API, empowering both internal teams and external clients. • Provided top-tier technical support for VIP clients. Collaborated closely to troubleshoot and optimize their integration experiences. Technologies: Kotlin, Spring Boot, Micronaut, MySQL, Flyway, Bitbucket CI/CD, Terraform