Lead Software Engineer

Java 17+ (21 a plus); strong OO fundamentals, collections, streams, basic concurrency. Spring Boot — REST controllers, @Service / @Repository layering, validation, profiles, externalized configuration, Actuator. Spring Data JPA / Hibernate — entity modeling, relationships (@OneToMany, @ManyToOne), basic fetch strategies (lazy vs eager), simple queries / criteria, Flyway or Liquibase awareness. Spring Security basics — securing REST endpoints, JWT / OAuth2 client wiring, method security, password handling. Persistence — working knowledge of MySQL (queries, indexes, joins) and at least awareness of MongoDB (documents, basic queries, aggregation); production exposure to one is required. API & integration basics — REST, OpenAPI/Swagger, JSON handling (Jackson), basic messaging (Kafka / RabbitMQ / JMS) awareness. Build & test — Maven or Gradle; JUnit 5, Mockito, Spring Boot Test, ideally Testcontainers.