Senior Backend Engineer (Node.js)

Location: Warsaw, Poland

Company

hirify.global operates a large-scale mobile app measurement and SaaS platform processing more than 200 billion mobile app events daily across a global infrastructure.

What you will do

• Design, develop, and maintain scalable backend systems and data flows for accounts, apps, users, and onboarding.
• Help decouple legacy data stores, build resilient domain models, and adopt modern patterns such as GraphQL Federation.
• Write tested, production-grade code and own features from design through deployment and operation.
• Participate in architecture, design, and code reviews while contributing to the team roadmap.
• Collaborate with product managers, team leads, and engineers across SaaSLab and AFOS.
• Improve availability, security, operational excellence, and production issue resolution, including on-call participation.

Requirements

• 5+ years of software development experience with strong backend engineering skills.
• Experience building and operating production-grade distributed systems and high-scale cloud architectures.
• Strong understanding of software design, system architecture, and development best practices.
• Ability to own complex problems from design through production and work effectively across functions.
• Proficiency in written and verbal English.
• B.Sc. in Computer Science or equivalent practical experience.

Nice to have

• Experience with Domain-Driven Design and SaaS platform domains such as identity, access management, billing, multi-tenancy, or API gateways.
• Experience with core entity systems, identity or account management, and SaaS onboarding flows.
• Experience with Node.js, GraphQL, Neo4j, platform or infrastructure teams, or ad-tech systems.
• Experience working with hyper-scale systems or a recommendation from an hirify.global employee.

Culture & Benefits

• Work within a diverse, multicultural global organization operating from 25 offices across 19 countries.
• Engineering culture focused on ownership, collaboration, quality, curiosity, and continuous improvement.
• Equal-opportunity workplace supporting diversity and innovation.
• Access to modern tools, technologies, and AI-powered software development practices.