Back End Software Engineer

Uni Systems Group; Brussel Hoofdstad; Hybrid; EUR 65,000 - 90,000; Full time

Job summary

Uni Systems is seeking a skilled Back End Software Engineer to join the UniQue team in Belgium. You will build and maintain back-end web apps, APIs, and services, aligning with client needs and security standards.

You will design scalable data stores, implement authentication/authorization, and participate in CI/CD pipelines with containerized deployments on Kubernetes. A strong focus on performance, testing, and documentation is expected.

Qualifications

• Master’s degree or higher with substantial IT experience, or equivalent
• 7+ years IT experience with a Bachelor’s degree
• 12+ years IT experience with secondary education access to higher education
• Proficiency in Python and back-end development
• Strong understanding of RESTful API design and web services

Responsibilities

• Develop and maintain back-end web applications, services, and business logic
• Design, develop, and optimize APIs and server-side functionality
• Integrate front-end components with back-end systems and databases
• Create scalable, secure data storage solutions and apply security best practices
• Ensure performance, scalability, and reliability through optimization
• Develop documentation and CI/CD pipelines, including automated tests

Skills

Python back-end

RESTful APIs

OpenAPI/Swagger

Git workflows

Docker

Kubernetes

OAuth2 / OIDC / JWT

OpenTelemetry

SQL databases

NoSQL databases

i2 tech stack

OpenID Connect

Education

Master’s degree (EQF 7)

Bachelor’s degree (EQF 6) + 7+ years IT

Secondary education + 12+ years IT experience

Tools

Spring Boot

Hibernate

Node.js

Docker

Kubernetes

OpenAPI/Swagger

OpenTelemetry

Job description

At Uni Systems, we are working towards turning digital visions into reality. We are continuously growing and we are looking for a Back End Software Engineer to join our UniQue team.

What will you be doing in this role?

• Develop and maintain back-end web applications, services, and business logic.
• Design, develop, and optimize APIs and server-side functionality.
• Integrate front-end components with back-end systems and databases.
• Design and implement efficient, scalable, and secure data storage solutions.
• Apply security best practices, including input validation, authentication, authorization, secure storage, logging, and monitoring.
• Ensure application performance, scalability, and reliability through continuous optimization.
• Participate in the design and development of scalable software solutions.
• Maintain clean, organized, and high-quality code following established coding standards.
• Analyze, troubleshoot, and resolve application issues through code review, monitoring, and debugging.
• Perform unit and integration testing, validate code changes, and ensure software quality.
• Deliver solutions that meet functional and non-functional requirements and user expectations.
• Create and maintain technical documentation.
• Configure and support cloud-based back-end services, including serverless functions, storage services, and managed Kubernetes environments.
• Implement and maintain authentication and authorization mechanisms to secure APIs and services.
• Develop and maintain automated unit and integration tests within CI/CD pipelines.

What do you need to succeed in this position?

• Minimum Master’s degree (EQF Level 7) with at least 5 years of IT experience, a Bachelor’s degree (EQF Level 6) with at least 7 years of IT experience, or a secondary education diploma granting access to higher education with at least 12 years of professional IT experience.
• Proficiency in back-end development with Python and experience working with frameworks such as Spring Boot, Hibernate, and Node.js.
• Strong understanding of the full web development lifecycle, programming concepts, development tools, and best practices.
• Experience with Application Performance Monitoring (APM) tools such as Dynatrace, Splunk, and Elastic APM, with knowledge of OpenTelemetry for metrics, logs, and distributed tracing.
• Strong experience with relational databases, including PostgreSQL, Oracle, and MySQL, with the ability to write complex SQL queries and design efficient database structures.
• Knowledge of NoSQL databases such as MongoDB, CouchDB, and Cosmos DB, including consistency and performance considerations.
• Experience with version control systems and development workflows, including GitFlow, trunk-based development, and exposure to legacy systems using SVN.
• Experience designing, developing, documenting, and securing RESTful APIs and web services, including the use of OpenAPI/Swagger.
• Knowledge of containerization and orchestration technologies such as Docker and Kubernetes.
• Understanding of authentication and authorization standards, including OAuth 2.0, OpenID Connect (OIDC), JWT, and EU Login.
• Experience working with and strong understanding of the i2 technology stack.

One of the following or an equivalent certification:

• AWS Certified Developer
• Associate, Microsoft Azure Developer Associate, or CNCF Certified Kubernetes
• Application Developer (CKAD).

At Uni Systems, we are providing equal employment opportunities and banning any form of discrimination on grounds of gender, religion, race, color, nationality, disability, social class, political beliefs, age, marital status, sexual orientation or any other characteristics. Take a look at Diversity, Equality & Inclusion Policy for more information.