Senior Software Engineer

Babel Street develops AI and data analytics solutions for identity intelligence and risk operations. The Senior Backend Software Engineer builds and operates scalable backend services and data systems, and helps apply AI-assisted development tools across engineering workflows.

Responsibilities:

• Backend Engineering: Design, implement, test, and maintain backend services and data-processing pipelines using C# and .NET
• Data Processing and Search: Build and optimize systems for ingesting, indexing, storing, querying, and serving large datasets using Elasticsearch and SQL Server
• Performance and Scalability: Identify bottlenecks and improve service performance, query efficiency, reliability, and scalability
• Production Ownership: Own services throughout their lifecycle, from technical design and implementation through deployment and ongoing operation
• On-Call Support: Participate in an on-call rotation supporting systems that operate 24/7. Use metrics, logs, and alerts to investigate incidents, resolve issues, and implement improvements that reduce recurrence
• Technical Collaboration: Contribute to architectural discussions, lead design and code reviews, and mentor other engineers
• Development Practices: Evaluate and recommend improvements to our technology, tooling, and engineering workflows
• AI-Assisted Development: Use coding agents and AI-assisted tools for implementation, testing, and refactoring while maintaining accountability for code quality, security, and correctness
• Security and Compliance: Develop and maintain software in accordance with FedRAMP security and compliance requirements

Requirements:

• 10+ years of professional software development experience building and supporting enterprise applications
• Strong proficiency in C# and .NET, including designing, building, and troubleshooting production backend services
• Hands-on experience designing, operating, and optimizing Lucene-based search platforms, preferably Elasticsearch, including index design, mappings, query tuning, and cluster maintenance
• Strong SQL Server and T-SQL skills, including relational schema design, stored procedures, indexing, and query performance tuning
• Experience building, maintaining, and scaling data-intensive backend services
• Experience deploying and supporting production workloads on AWS or Google Cloud Platform
• Experience troubleshooting production systems using metrics, logs, and alerting
• Ability to work independently, collaborate effectively on a distributed team, and communicate technical decisions clearly
• Experience delivering software in an agile development environment
• Hands-on experience implementing and maintaining FedRAMP security controls for production software and cloud infrastructure
• Hands-on experience deploying, operating, and scaling backend services on Google Cloud Platform (GCP)
• Experience using AI coding assistants or agentic development tools for implementation, testing, and refactoring
• Experience with distributed systems and high-volume data-processing pipelines
• Experience mentoring engineers and leading technical improvements