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We are seeking a Senior Backend Engineer to take ownership of mission-critical backend systems that power real-time, high-throughput applications. In this role, you will design, build, and operate scalable services in a cloud-native AWS environment, with a strong focus on performance, reliability, and clean architecture.
Responsibilities
Backend Engineering: Design, implement, and maintain scalable backend services using Node.js (Express) and TypeScript.
System Design: Own technical decisions, service boundaries, API design, and reliability patterns for backend components.
Cloud & Infrastructure (AWS): Design, deploy, and operate backend services on AWS, leveraging managed services for scalability, reliability, and security.
Database Ownership: Design schemas, write and optimize SQL, and improve PostgreSQL performance (indexes, query plans, migrations).
Real-Time Functionality: Build and operate real-time features using WebSockets (socket.io), ensuring stability under load.
Performance and Scalability: Improve throughput and latency, and proactively address bottlenecks across services, infrastructure, and the database.
Quality and Testing: Write and maintain unit and integration tests, and raise overall engineering quality.
Debugging and Incident Support: Troubleshoot complex production issues across the stack and AWS infrastructure, and implement long-term fixes.
Collaboration: Work closely with product owners and engineering teams to deliver high-impact features with predictable execution.
Continuous Improvement: Contribute to better tooling, standards, and engineering practices across the backend team.
Requirements
Proven experience as a Senior Backend Engineer (or backend-focused fullstack engineer) delivering production systems at scale.
Strong expertise in Node.js and Express with TypeScript.
Strong proficiency in PostgreSQL, including schema design, migrations, data modeling, and query optimization.
Hands-on experience with WebSockets and real-time systems (preferably socket.io).
Solid experience with AWS, including deploying and operating backend services using services such as EC2, ECS/EKS, RDS, S3, CloudWatch, and IAM.
Understanding of cloud-native concepts such as scalability, high availability, observability, and security.
Strong problem-solving skills and ability to work independently on ambiguous, complex tasks.
Solid communication and collaboration skills in a fast-paced, cross-functional environment.
Experience with CI/CD pipelines and DevOps practices.
Nice to Have
Experience with Infrastructure as Code (Terraform, CloudFormation, or CDK).
Experience with React.js and state management (Mobx is a plus) for occasional frontend contributions.
Experience with crypto transactions.
Familiarity with testing frameworks like Jest or Mocha.
Experience working in Agile/Scrum teams.
Senior Backend Engineer (AWS, Node.js, TypeScript, PostgreSQL, Real-Time) • Bucharest, Bucharest, .RO
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