Senior Software Engineer (.NET, Node.js, Go)

GR8_TECH builds B2B iGaming platforms for operators who play to lead.
We deliver full-cycle, high-impact tech designed to scale — from seamless integrations and expert consulting to long-term operational support. Our platform powers millions of active players and drives real business growth. Call it what it is: the iGaming Platform for Champions.
With 1000+ GR8 people across locations and time zones, we don’t just ship technology — we help operators build success stories across brands, markets, and geos.
Our ambition drives us. Our people make it real.
If you’re a challenger in spirit and a champion in action — join us.

Why this role exists:
As a Senior Full-Stack .NET Engineer, you will play a critical role in designing, developing, and maintaining enterprise-level applications across our backend stack based on .NET, Node.js, Go and related technologies. You will lead technical discussions, mentor junior team members, and collaborate with cross-functional teams to deliver scalable and robust software solutions that meet business requirements and industry standards. This role offers the opportunity to make a significant impact, shape product direction, and contribute to the growth and success of the team.

What you’ll drive:
Architecture & Execution
Design and implement scalable, efficient, and secure enterprise-level software architectures across our .NET stack.
Write, test, and debug complex code for high-load systems with strict latency and reliability requirements.
Deliver clean code to production in a timely manner, balancing business speed with technical excellence.
Identify and eliminate performance bottlenecks across CPU, memory, I/O, and database layers.
Engineering Quality & Observability
Conduct thorough code reviews to enforce strict code quality, security, and industry best practices.
Develop and enforce testing protocols to guarantee software reliability and flawless production performance.
Implement and monitor production observability frameworks, including logging, metrics, monitoring, and distributed tracing.
Create and maintain concise, meaningful technical documentation for system designs and architecture.
Collaboration & Leadership
Provide guidance and mentorship to junior and mid-level engineers, actively fostering their technical growth.
Partner with Delivery Managers to lead and manage software development projects, ensuring predictable, high-quality delivery.
Collaborate closely with product management, design, and operations teams to align technical execution with business goals.
Communicate effectively with stakeholders, translating complex technical concepts into clear project updates.

What makes you a GR8 fit:
Minimum 5 years of experience in a similar senior engineering role with a track record of leadership, strong technical skills, and successful project delivery.
Deep hands-on expertise in C# and .NET (Core / .NET 6+).
Commercial experience or a strong willingness to learn and work with Golang and Node.js.
Experience designing and evolving high-load backend systems with strict latency and reliability requirements.
Experience working REST API and web services.
Strong understanding of async/await, multithreading, thread safety, memory management, and performance optimization.
Ability to identify and eliminate performance bottlenecks across CPU, memory, I/O, and database layers.
Experience designing and operating microservice-based systems.
Experience working with relational and non-relational databases.
Understanding of transactions, isolation levels, locking, concurrency, indexing strategies, and performance tuning.
Experience working with containerized environments including Docker and Kubernetes.
Understanding of CI/CD pipelines and automated delivery.
Understanding of scalability, load balancing, auto-scaling, and disaster recovery.
Understanding of production observability including logging, metrics, monitoring, and tracing.

Why you’ll love working here:
Benefits Cafeteria — annual budget you allocate to:
Sports • Medical • Mental health • Home office • Languages.
Work-life & support
Paid maternity/paternity leave + monthly childcare allowance.
20+ vacation days, unlimited sick leave, emergency time off.
Remote-first + tech support + coworking compensation.
Team events (online/offline/offsite).
Learning culture with internal courses + growth programs.

Our culture & core values:
GR8_TECH culture is how we win — through trust, ownership, and a growth mindset. We move fast, stay curious, and keep it real, with open feedback, room to experiment, and a team that’s got your back.
FUELLED BY TRUST: we’re open, honest, and have each other’s backs.
OWN YOUR GAME: we take initiative and own what we do.
ACCELER8: we move fast, focus smart, and keep it simple.
CHALLENGE ACCEPTED: we grow through challenges and stay curious.
BULLETPROOF: we’re resilient, ready, and always have a plan.