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Backend Area

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Backend Opportunities made for you!

All jobs

Meet Rebeca and the opportunities you can have as a .NET Developer

Meet Raffaele and the opportunities you can have as a Java Developer

.NET Technical Path

  • JUNIOR

    Fundamentals of C# and .NET.

    .Net Framework/Core: basic syntax, data types, and control flow.

    Understanding of Databases: SQL and the ability to perform CRUD operations.

    Version Control: Knowledge of Git.

    Basic Principles of Object-Oriented Programming (OOP)

  • PROFESSIONAL

    Proficiency in C# and .NET Framework/Core. 

    Strong skills in complex SQL queries and familiarity with ORMs like Entity Framework.   

    Experience with RESTful service implementation.

    Experience writing tests with NUnit or xUnit.

    Understanding of SOLID principles.

  • SENIOR

    Advanced knowledge in .NET framework/Core.

    Expertise in scalable and high-performance systems.

    Ability to design system architecture and understand complex software design patterns.

    Proficiency with cloud platforms: Azure, AWS, or Google Cloud.

    Experience in setting up and maintaining CI/CD pipelines.

Java Technical Path

  • JUNIOR

    Fundamentals of Java language.

    Good understanding of Object-Oriented programming principles.

    Know how to manage interfaces, classes, and objects.

    Build your first web app with Spring or Spring Boot.

    Basic knowledge of unit testing frameworks (e.g., JUnit, Mockito).

  • PROFESSIONAL

    Proficiency in Java language.

    Proficient with Spring and functional programming.

    Good knowledge of object-relational mapping and NoSQL database.

    Familiarity with common design patterns (e.g., Singleton, Factory, Observer) and SOLID principles.

    Extensive testing approach by leveraging diverse testing libraries.

  • SENIOR

    Mastery of the Java language, including advanced features.

    Proficiency in design patterns, architectural patterns, and best practices (e.g., CQRS, Hexagonal Architecture, Clean Code).

    Understand JVM memory management, garbage collector and its optimization.

    Expertise in managing complex concurrency scenarios and solving synchronization and thread-safety issues.

People who make it happen: .NET & Java Developers Stories

  • Daniel - .NET developer

    "ERNI gives the opportunity to choose projects that allow you to continue your learning path. Is a good company to gain experience and gives you opportunities to grow if you want."

  • Fernando - Java developer

    "ERNI offers me the opportunity to be part of a very exciting project in MedTech and offers me the prospect that future projects may be equally interesting." 

.NET Community

  • Meetups & Internal sessions


  • Twitch sessions


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About ERNI Spain

ERNI is a Swiss Software Engineering company leader in building complex, customized software solutions. It’s more than 25 years of using technology to have a positive impact on people's lives.

We build digital solutions that connect the physical world (devices & connectivity) with the digital one (software solutions, connected, or consuming their data). Our teams are focused on prioritize the software lifecycle & to ensure that our code is both clean and secure. Our maturity in building high-impact software solutions approaches us whatever industry looking for quality and sophistication (e.g. Gaming, FMCG or Validation & Inspection..).

Our leadership in the Health-Tech (Diagnostic Medical Devices, Pharma, Health Care and more) and in all industries around Smart Devices (Robots, Cars, 3D Printers, Machinery), in a powerful combination with the way we growth people, let us create a growing, learning and challenging set up for ERNIans.

Founded in 1994
Coworkers 300