Senior Software Engineer

Job Title: Senior Software Engineer - React

Location: New Belgrade

Work Pattern: Hybrid (Ideally 3 days a week on-site)

Reports to: Technical Lead

About Greencastle Digital

Greencastle Digital has launched a new Development Centre in Belgrade, which opened 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

• Frontend Software Development: Design, develop, and maintain robust and scalable software applications using React, Next.js & TypeScript.

• 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.

• Backend Development: Work very closely with the backend team using .NET and C#, and collaborate on integration between APIs and frontend services.

• Cloud Integration: Assist in managing applications on Microsoft Azure Cloud and AWS Cloud services.

• 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 React, Next.js & TypeScript:

• Strong proficiency in React, Next.js & TypeScript.
• Solid understanding of SOLID principles and design patterns.
• Understanding of modern frontend development concepts such as Single-Page Applications (SPA) and Progressive Web Applications (PWA).

Backend Development Skills:

• Understanding of some basic architecture of .NET and C# based applications.

Cloud Knowledge:

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

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.