# Backend Software Engineer

**Company:** [SquareDev](http://jobs.workable.com/companies/wQZ5ptvWTa31vomire9Cix.md)
**Location:** Athens, Greece
**Workplace:** hybrid
**Employment type:** Full-time
**Department:** Consulting

[Apply for this job](http://jobs.workable.com/view/4e58e5b2-8f38-42ac-b1db-a823d2aebe95)

## Description

### **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, 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 **Back-End Software Engineer** to develop and maintain secure, scalable server-side applications. Working alongside front-end developers and cross-functional teams, you will implement core business logic, design data storage solutions, and ensure software quality through robust testing and documentation practices.

## Requirements

**The ideal candidate will be responsible for:**

-   Develop and maintain back-end applications, implementing business logic and integrating server-side functionality with front-end components.
-   Design and implement scalable data storage solutions and RESTful APIs.
-   Apply security best practices across authentication, authorization, input validation, and secure logging.
-   Optimize applications for performance and scalability, including cloud service configuration (serverless, storage, managed Kubernetes).
-   Write clean, well-structured code and maintain code integrity across the codebase.
-   Perform unit and integration testing, debug and fix issues, and validate code changes prior to deployment.
-   Set up and query monitoring tools to troubleshoot problems and identify areas for improvement.
-   Produce and maintain technical documentation for all developed components.

**To excel in this role, you'll need:**

-   Proficiency in back-end programming languages (Java, PHP) and frameworks such as Spring Boot, Hibernate, and Node.js.
-   Experience with APM tools (Dynatrace, Splunk, Elastic APM) and familiarity with OpenTelemetry for observability.
-   Solid knowledge of relational databases (PostgreSQL, Oracle, MySQL) including complex SQL, and experience with NoSQL stores (MongoDB, CouchDB, CosmosDB).
-   Familiarity with Git workflows (GitFlow, trunk-based development) and legacy SVN systems.
-   Experience designing and documenting secure RESTful APIs using OpenAPI/Swagger standards.
-   Knowledge of containerization and orchestration technologies (Docker, Kubernetes).
-   Understanding of authentication and authorization standards (OAuth 2.0, OpenID Connect, JWT).
-   Strong English communication skills, French is an asset.

**Nice to have:**

-   One of the following or an equivalent: AWS Certified Developer – Associate, Microsoft Azure Developer Associate, or CNCF Certified Kubernetes Application Developer (CKAD).