Fullstack Engineer

Why are you looking for a job?

If your answer ticks all the boxes, this could be the start of a great collaboration.

• You have a curious mind - You won't understand what we're talking about if you don't 🤔
• You want to learn more around technology - You won't survive if you don't 😱
• You want to make the world a bit better - We don’t like you if you don’t 😎

We happen to be just like that as well. We like hacking things here and there (you included) and create scalable solutions that bring value to the world.

SquareDev? 🐿️

We use state-of-the-art technology to build solutions for our customers and our partners' customers. We make sure we stay best-in-class by participating in research projects across Europe, collaborating with top universities and enterprises on AI, Data, and Cloud.

About QnR Group

SquareDev is a member of the QnR Group, a leading technology organization specializing in end-to-end custom software solutions, Artificial Intelligence, Cybersecurity, SAP S/4HANA, SAP Business One, ServiceNow, and FinTech solutions.

As part of QnR Group's ongoing expansion — both in Greece and internationally — we are continuously hiring across a wide range of tech roles. Successful candidates may be hired by QnR Group, or another company within the Group, depending on the role and project.

Role overview

We are looking for a Fullstack Software Engineer who can own features across the entire technology stack, from crafting intuitive user interfaces to engineering server-side logic and database layers. You will act as a bridge between front-end and back-end disciplines, contributing to cohesive, end-to-end software solutions built for scale and security.

Requirements

The ideal candidate will be responsible for:

• Develop and maintain features across the full stack: user interfaces, API consumption, server-side business logic, and database interactions.
• Design and implement RESTful APIs, ensuring they are well-documented and securely built.
• Apply security best practices including input validation, authentication, authorization, and secure data storage.
• Ensure applications are responsive, cross-browser compatible, and optimized for performance.
• Deploy and manage applications on cloud platforms using CI/CD pipelines and containerization technologies.
• Bridge communication between front-end and back-end teams to ensure cohesive system integration.
• Participate in the design and delivery of scalable, maintainable software architectures.
• Perform unit and integration testing, debug issues across the stack, and produce technical documentation.

To excel in this role, you'll need:

• Proficiency in front-end languages (JavaScript, HTML, CSS) and frameworks (Angular, React, Vue, Bootstrap) with experience in modern build tools (Webpack, Vite).
• Back-end proficiency in Java, Node.js, or PHP, with hands-on experience in Spring Boot, Hibernate, and REST API development.
• Solid experience with both relational (PostgreSQL, Oracle) and non-relational (MongoDB) databases, including schema design and query optimization.
• Knowledge of cloud services (AWS, Azure) and experience with Infrastructure-as-Code tools (Terraform, CloudFormation, Azure Bicep).
• Experience with containerization and orchestration technologies (Docker, Kubernetes).
• Understanding of authentication standards (OAuth 2.0, OpenID Connect, JWT) and API documentation practices (OpenAPI/Swagger).
• Familiarity with Git workflows (GitFlow, trunk-based) and legacy SVN systems.

Nice to have:

• One of the following or an equivalent: AWS Certified Developer – Associate or Microsoft Azure Developer Associate.