Spring is the most popular app development framework for enterprise Java and is an absolute non-negotiable for your Java candidate. non-relational: NoSQL, MongoDB, Cassandra, Redis, DynamoDB, neo4j etc.). Given the flexibility and the breadth of use cases for the Java language, both kinds of database are relevant, depending on the nature of the project in question.Ī flexible Java dev will need to be familiar with both kinds of databases, as well as some of the most prominent database systems for each (relational: MySQL, Microsoft SQL server, PostgreSQL, Oracle etc. There are pros and cons to each and which database you use will depend on the kind of data you have. Relational databases store structured data in rows and columns while non-relational databases store unstructured and semi-structured data in a looser, but more flexible format.
Your Java developer should have a strong grasp of objects and classes in Java, as well as the four key features of OOP: abstraction, encapsulation, polymorphism and inheritance.
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This makes complex problems easier to solve, creates objects that can be reused across programs, and means that code is easier to debug and more secure because the data is encapsulated into objects. Object-oriented programming (OOP) languages are organized around data -or objects -rather than functions and logic, with all programming operations carried out using these objects. In addition to substantive experience, they should be familiar with the principles of system design, core concepts such as scalability, failover, fault tolerance as well as different architecture patterns like client-server, peer-to-peer, microservices, distributed systems etc. This is a difficult skill because it is so open-ended: there are infinite ways to create any given system and no single correct solution.Įxperience is the best teacher in this case, which is why hiring a Java developer with solid systems design and architecture experience is critical. Technical Skills System design and architectureĭesigning and architecting systems is the art of conceptually planning out the components of a system to achieve the desired objectives.
In this blog, we’ll explore the technical and business skills that you need to look for in a prospective Java candidate who will be a real asset to your team. But how can you tell which ones really know their stuff? Known for its simplicity, security, versatility and flexibility it is used for creating applications of all shapes and sizes:ĭue to the popularity of the language, there are millions of Java developers out there. The Popularity of Programming Languages Index ranks Java as the second most popular language in 2021. Java is a cross-platform, object-oriented programming language designed to be used in the distributed environment of the internet.Ĭreated in 1995, it has become one of the most popular programming languages in history.
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