Senior Software Engineer

Green Castle Digital d.o.o.

Beograd | Hibrid

12.07.2025.

.NET C# SQL JavaScript CSS HTML Oracle AWS Cloud senior

Job Title: Senior Software Engineer
Location: New Belgrade
Work Pattern: Hybrid (Ideally 3 days a week on-site)
Reports to: Technical Lead

About Greencastle Digital:

Greencastle Digital launched a new Development Centre in Belgrade in January 2025. We are a forward-thinking company operating within the dynamic betting and gaming industry. Our mission is to bring together the brightest minds in digital technology, product development, customer experience, and marketing to deliver cutting-edge solutions for clients across Europe.

About the Role:

We are seeking an experienced Senior Software Engineer to join our team in Belgrade. In this role, you will play a key part in developing high-quality software solutions that drive our business forward. You will work closely with cross-functional teams, contribute to architectural decisions, and ensure that our platforms are scalable, reliable, and efficient.

This position requires a combination of strong technical expertise, problem-solving skills, and the ability to collaborate effectively with team members and stakeholders.

Key Responsibilities:

Software Development: Design, develop, and maintain robust and scalable software applications using .NET and C#.
Technical Collaboration: Work closely with the Tech Lead and other team members to implement technical solutions that meet business requirements.
Code Quality: Write clean, efficient, and testable code while adhering to best practices and coding standards.
Frontend Development: Contribute to frontend tasks using JavaScript, HTML, and CSS, ensuring UI consistency and responsiveness.
Cloud Integration: Assist in deploying and managing applications on AWS Cloud services.
Database Management: Develop and optimize database queries and procedures using Oracle and SQL, handling large datasets and real-time data.
Design & Architecture: Participate in designing and modelling the architecture and subsystems of the platform.
Continuous Improvement: Stay updated with the latest industry trends and technologies to enhance our products and processes.
Documentation: Create and maintain technical documentation for development processes and features.

Required Qualifications

Experience:

Minimum of 6 years of hands-on software development experience.

Expertise in .NET and C#:

Strong proficiency in .NET and C#.
Solid understanding of SOLID principles and design patterns.

Frontend Development Skills:

Mid-level proficiency in JavaScript, HTML, and CSS.
Understanding of modern frontend development concepts such as Single-Page Applications (SPA) and Progressive Web Applications (PWA).

Cloud Knowledge:

Beginner to mid-level understanding of AWS Cloud services.
Basic experience with deploying applications on the cloud.

Database Skills:

Practical knowledge of Oracle and SQL databases.
Experience working with large datasets and real-time information.

Design & Architecture:

Ability to contribute to the design and modelling of platform architecture and subsystems.

Additional Skills:

Strong problem-solving abilities and attention to detail.
Excellent communication and teamwork skills.
Ability to work in an agile development environment.

What We Offer:

Innovative Environment: Be part of a groundbreaking team in a newly established Development Centre.
Professional Growth: Opportunities for continuous learning and career advancement.
Collaborative Culture: Work in a supportive environment that values collaboration and innovation.
Flexible Work Pattern: Enjoy a hybrid work environment with a balance of remote and on-site collaboration.

How to Apply:

If you're passionate about technology and eager to contribute to innovative projects in a collaborative, fast-paced environment, we'd love to hear from you!

Please submit your resume and a cover letter detailing your relevant experience and why you're interested in joining Greencastle Digital.