Senior Backend Developer (Node.js)

CrustLab is more than a software development company. It’s a powerhouse of innovation, expertise, and technical excellence for all things iGaming.

What does it mean?

At our core, we craft gambling software (sportsbooks and casino platforms included) with a touch of gaming and sports. But we also excel at developing Fintech and Blockchain-based solutions.

Serving clients across the globe, CrustLab doesn’t just code web or mobile apps, but handles product development comprehensively, from ideation and design to maintenance.


Our talented team is driven by ambition and passion for continuous growth.
We just love the challenge of turning original visions into reality.

Requirements

• Minimum 4 years of experience working in a Node.js environment.
• Proficiency in strongly typed languages, with a particular focus on TypeScript.
• Hands-on experience with both relational and non-relational databases (e.g., MongoDB).
• Experience in implementing various communication protocols, including building REST and gRPC-based APIs, as well as handling synchronous (WebSockets) and asynchronous communication (Message Queues, including Kafka, RabbitMQ, or similar).
• Proficiency in working with containers and a basic understanding of orchestration tools like Kubernetes.
• Solid knowledge of architectural patterns, such as Hexagonal Architecture, Modular Monolith, and the Outbox Pattern.
• Ability to take full ownership of a given module or area, including code quality and reliability.
• Skills in AI-assisted programming and effective collaboration with AI coding agents.
• Basic experience with cloud platforms such as AWS, Azure, or GCP.
• Practical application of Test-Driven Development (TDD) in daily work. We emphasize writing tests as an integral part of the development process, not just as an afterthought. We expect proficiency in creating various types of tests (unit, integration) and experience with tools like Testcontainers.
• Language skills: Fluency in Polish and at least B2 proficiency in English.

You will be focusing mainly on

• Full Lifecycle Involvement: Participating in all phases of the software development life cycle,
• System Architecture: Collaborating with the team to design system architecture,
• Feature Development: Implementing new features based on user stories and assigned tasks,
• Progress Tracking & Documentation: Monitoring work progress in JIRA and documenting all implemented changes,
• Code Quality & Review: writing well-designed, testable, and efficient code & conducting and participating in code reviews,
• Maintenance: Troubleshooting and fixing bugs identified in the production environment,
• Agile Collaboration: Working within the Scrum framework, including active participation in project meetings with the team, clients, and Project Managers,
• Growth & Mentorship: Developing personal skills and supporting team growth through knowledge sharing, mentoring, recommending new tools, and seeking best-in-class solutions.

What we offer