Senior Back-End Engineer (Node.js)
Remote · Warsaw, Mazovia, Poland
Job Summary
Senior Backend Engineer to design and build backend microservices for a unified enterprise platform for a B2B telecom customer. Responsibilities include building backend modules (Identity/RBAC/MFA, number search, purchase and porting, onboarding automation, CDR and billing pipelines), integrating with external carrier and third-party APIs (Operator Connect, number/porting providers, ServiceNow, payment systems), implementing event-driven workflows (Kafka, Temporal), developing automated tests, participating in code reviews, following CI/CD practices, collaborating with Business Analysts to refine requirements, and coordinating with Frontend Engineers on API contracts. Requires 5+ years of backend development with Node.js and TypeScript, strong microservices and API design experience (REST/GraphQL), PostgreSQL and data modeling, third-party API integrations, Kafka, Temporal, Docker/Kubernetes (EKS), AWS, and English at B2 level or higher. Nice-to-have: AWS certifications, Node.js certifications, telecom/VoIP experience. Relocation program available and remote-work culture emphasized.
Required Qualifications
- 5+ years backend development experience with Node.js and TypeScript
- Strong background in microservices architecture and API design (REST and GraphQL)
- Relational databases experience (PostgreSQL) and data modeling
- Experience with external API integrations (telecom, VoIP/SIP)
- Hands-on experience with event-driven systems (Kafka)
- Experience with workflow orchestration tools (Temporal.io)
- Containerization and orchestration with Docker and Kubernetes (EKS)
- AWS cloud services experience
- English proficiency at B2 level or higher
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