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Threenitas

Boutique software design, development, and marketing

Full-Stack Developer Trainee Intern

InternshipUpdated on 10/17/2026
No salary listed
Bachelor's
Athens, Greece
Hybrid
Software EngineeringFull-Stack Engineering

About the job

Requirements
  • Familiarity with object-oriented languages and university-level programming skills.
  • Enjoy coding, regardless of the programming language.
  • Familiarity with any database management system, such as MySQL, PostgreSQL, or SQL Server, and SQL.
  • A special attention to detail and desire to understand how technologies work, not just how they are used.
  • A problem-solving mentality and understanding that coding is a skill that requires practice to acquire.
  • Prior experimentation with backend frameworks such as .NET 5/6, Java Spring Boot, Node.js, and/or JavaScript frameworks such as Angular.
  • Undergraduate studies in Computer Science, Engineering, Mathematics, Physics, or a relevant field.
  • Interest in technology and keen interest in applying technology to improve people's everyday lives.
Responsibilities
  • Learn to build web-based applications such as content-management platforms and web APIs supporting mobile apps and cloud-based solutions.
  • Design, implement, and deliver products as part of the engineering team.
  • Work on real-world problems and project challenges that reach thousands of users.

About the company

Threenitas S.A. is a boutique software development house that designs, builds, and supports integrated software system solutions. It also provides implementation and operational support for digital marketing projects. The company works by analyzing client needs, designing architecture, developing and integrating software modules, deploying solutions, and delivering ongoing maintenance and support. What sets Threenitas apart is its focus on end-to-end, architecture-driven delivery from a small team of experts, a proven track record of more than 450 completed projects, and several award-winning efforts showcased in its portfolio. Its goal is to deliver reliable, well-structured software systems and sustained operational support that help clients achieve their business and marketing objectives, while forming long-term partnerships.

Company Size

11-50

Company Stage

N/A

Total Funding

N/A

Headquarters

Attica, Greece

Founded

2010

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Simplify's Take

What believers are saying

  • Threenitas launched DANNEMANN Group's website in January 2025, showing active client wins.
  • HR Nation platform updates in 2025 expand enterprise workflow relevance.
  • Updated site content on July 31, 2026 suggests ongoing commercial momentum.

What critics are saying

  • No funding data is public, limiting scale against larger European integrators.
  • Career pages still show trainee roles in 2025, hinting constrained growth investment.
  • Award dependence masks execution risk if mobile demand softens in 2026.

What makes Threenitas unique

  • Threenitas won Mobile Agency of the Year 2025 for the second straight year.
  • Its 450-plus projects and 50 awards signal deep Greek execution depth.
  • Official site spans software development, AI, HR platforms, and digital marketing support.

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Benefits

  • Hybrid Work Options
  • Remote Work Options
  • Flexible Work Hours