Constantin Lungu

• Developed backend applications within Sherlock ecosystem ensuring scalability, performance and maintainability while collaborating closely with the domain experts;

• Designed and implemented Sherlo-query, a reusable query abstraction library adopted across multiple backend services, enabling dynamic, type-safe SQL query generation, reducing duplicated query logic, and improving maintainability.

• Designed, implemented, and integrated a centralized IAM (Identity and Access Management) solution across the Sherlock ecosystem, providing secure authentication, role-based authorization, and fne-grained access control for multiple backend services and user roles;

• Conducted continuous refactoring and codebase improvements, enhancing system reliability, consistency across all services, readability and long-term maintainability;

• Diagnosed and resolved complex production issues and bugs, ensuring high system availability and stability;

• Supported infrastructure related task within access permissions including deployments, confguration and environment troubleshooting

•Performed full-stack development when required, implementing Angular UI enhancements and bug fxes alongside backend development.

• Integrated Azure-based identity using Azure AD B2C (OAuth2, Spring Security) across multiple backend services

• Built integrations withMicrosoft Graph API for user management and email delivery

• Debugged containerized services during cloud migration and deployment to greenfeld environments

• Worked in close collaboration with the Data Services (cloud/platform) team, operating with read-only access, contributing to issue investigation, troubleshooting, and alignment between application and infrastructure layers Acquired skills knowledge: Spring, Java 17, 21, Angular, TypeScript, MSSql, PostgreSQL, Azure, Codex, ChatGPT, Impala, Grafana, CI/CD, AssertJ, Copilot, Grafana, TestContainers, Wiremock, AssertJ

• Worked in a retail/telecommunication project;

• Implemented and designed a solution for managing and reporting of the reviews for the products in the platform, along side with exporting the reports in different formats (.xls, .csv) and sending emails in different scenarios;

• Integrated new payment system supporting credit and installments, boosting monthly user growth by 20%;

• Maintained and provided fxes for other services in the ecosystem; Acquired skills and knowledge: Java 8 ,11, Kotlin, Spring Framework, PostgreSQL, Kafka, GraphQL, ElasticSearch, Grafana, Kibana, Redis, Docker and Kubernetes, TestContainers, Wiremock, AssertJ

• Worked in a fast-paced startup environment with tight deadlines and complex business rules governed by European Banking Authority regulations;

• Collaborated with developers and implemented payment systems solutions for integration in Eurozone (SEPA Instant, SEPA Credit Transfer, SEPA Direct Debits);

• Maintained production environment safe through monitoring, fxing production incidents and responding to alerts;

• Designed and implemented backend services, including REST APIs and asynchronous event-driven workflows, ensuring scalability, reliability, and alignment with business requirements;

• Updated a number of legacy systems that the business depended on, like debt collection services and payment systems in SEPA Area;

Acquired skills and knowledge: Java 8, 11, Kotlin, PostgreSQL, Google Cloud Platform, Spock, Event Driven Architecture, E2E Testing, TeamCity, Docker and Kubernetes, Gradle