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.

• 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.

• 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.