Professional knowledge — Object Oriented Design Principles: DRY, SOLID, etc. — Software Development Process Methodologies: YAGNI, KISS. — Design Patterns: GOF Design Patterns: Builder, Singleton(all possible problems and solutions), Factory Method, Abstract Factory, Adapter, Decorator, Template method. — Architectural Design Patterns: MVC, DAO. — Software Development Process Methodologies: Agile/Scrum, Waterfall. — Software Architectural Design: Monolith, Microservices. — Web services: RESTful. — Java: OOP, Collections, Multithreading (Moore law, cache lines, volatile, atomic operations, synchronization, object monitor, etc), Generics, Serialization, Annotations, Streams. — JVM Architecture: Classloaders (All types and phases), Runtime Data Area, Execution Engine. — Garbage Collector: Architectural design, working process, different types (Serial GC, Concurrent GC, Parallel GC, G1). — Databases: RDBMS (MySQL), Indexes, ACID. — Frameworks/technologies/other: Spring, Spring boot, Spring Data, Spring Security, Hibernate, Maven, JDBC, JSP, JSF, Primefaces, Servlets, Liquibase, SQL, DB Index Types: Clustered, Nonclustered, DB Transaction properties: ACID (Atomicity, Consistency, Isolation (Read uncommitted, Read committed, Repeatable reads, Serializable), Durability, XML, DOM, XPath, XSL, HTML, CSS, Javascript, Git.