Senior Backend Developer

Help build the engine behind a high-growth iGaming and sports betting platform. Our client is investing heavily in technology to create a world-class betting and gaming experience – real-time markets, instant payouts, and a seamless journey for players. They are looking for a Senior Backend Developer who thrives on complex systems, high traffic, and the satisfaction of building something that has to work – perfectly – under pressure. If you like low-latency, high-availability systems and you want your work to be directly tied to the product's success, this is the role. The Opportunity You will help architect and build the backend services that power betting, gaming, wallets, payments, and player account management. This is not a legacy maintenance role – you will be at the heart of new feature development, platform evolution, and technical decision-making. You'll work closely with other senior engineers, product, and DevOps to push performance, reliability, and scalability every day. What You Will Do Design, build, and maintain backend services and APIs that power core betting, gaming, and player account functionalities. Develop low-latency, highly available services that comfortably handle spikes of traffic around big sporting events. Contribute to a modern microservices architecture with clear service boundaries, resilience, and observability built in. Integrate with third-party providers (payments, risk, KYC, data feeds, trading, content) and ensure these integrations are reliable and secure. Help define technical standards, patterns, and best practices for backend development across the team. Write clean, maintainable, and well-tested code; participate actively in code reviews and design discussions. Drive performance tuning, capacity planning, and optimisation across services and data stores. Implement and improve logging, monitoring, and alerting to keep downtime to an absolute minimum. Mentor other engineers, providing guidance on architecture, design, and engineering best practice. Support production systems when needed, helping to diagnose and resolve complex issues quickly and permanently. Tech Environment You do not need every one of these, but you must bring deep experience with a modern backend stack and be willing to work across the environment: Languages: Java, Kotlin, Go, C#, or Node.js / TypeScript Architecture: Microservices, RESTful APIs, event-driven systems Data: Relational databases (e.g. PostgreSQL, MySQL), NoSQL, caching (Redis, Memcached) Messaging / Streaming: Kafka, RabbitMQ, or equivalent Cloud & DevOps: AWS, GCP, or Azure; Docker, Kubernetes, CI/CD pipelines Practices: TDD/BDD, automated testing, continuous delivery, Git-based workflows, trunk-based development What You Bring Strong experience as a Backend / Server-Side Engineer, with several years operating at Senior level. Proven success designing and running high-volume, mission-critical systems in production. Solid understanding of distributed systems, concurrency, performance optimisation, and fault tolerance. Ability to design clean APIs and data models aligned with product requirements and long-term scalability. Experience with observability – metrics, tracing, logging – and using data to improve reliability and performance. Comfort working in an agile, product-driven environment where priorities can move quickly. Clear communication skills and the ability to collaborate with engineers, product, and non-technical stakeholders. Experience in iGaming, sports betting, online gaming, payments, fintech, or another high-transaction / regulated environment is a significant advantage. Why This Role? You build what players feel: The systems you develop directly impact user experience, speed, and trust. Technical challenge: High throughput, low latency, and always-on systems – this is real engineering, not just CRUD. Room to grow: Move towards principal engineer, lead roles, or specialised architecture paths as the platform and team expand. Modern stack and mindset: Work with current technologies and a team that is open to improvement and innovation. Competitive offer: Strong salary, benefits, and hybrid working from Toronto. Interested? If you are a Senior Backend Developer who enjoys working on complex, high-scale systems and wants to be at the heart of an ambitious iGaming and sports betting platform, we would like to review your profile. Please send your CV and a short overview of the most complex or highest-scale backend system you have worked on, including your role and impact.