Senior Software Engineer

About the Role 

We are seeking a Senior Backend Software Engineer to build and evolve the data systems that power Babel Street’s enterprise applications. 

In this hands-on role, you will design, build, and operate backend services that ingest, process, index, store, and serve large volumes of data. You will collaborate with other engineers to plan feature enhancements, make architectural decisions, and deliver reliable, scalable solutions from design through production. 

You will also use AI-assisted and agentic development tools to improve engineering productivity and help strengthen our practices for incorporating these tools into everyday development. 

This position is ideally near our Somerville, MA office but remote candidates will be considered. Eastern or Central time zones are preferred. 

Why This Role Matters 

You will help Babel Street transform vast, fast-moving streams of data into intelligence that customers use to make critical decisions. The backend systems you build will power this transformation by ingesting, processing, indexing, and serving data at the speed and scale those decisions demand. 

You will help shape how Babel Street applies agentic development across the software lifecycle. You will work with engineers across the organization to make coding agents effective, secure, and reliable. 

Key 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. 

Required Qualifications 

• 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. 

Preferred Qualifications 

• 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. 

Benefits at Babel Street (just to name a few...)

• Health Benefits: Babel Street covers 85-100% monthly premium costs for Medical, Dental, Vision, Life & Disability insurances – for you and your family!
• Retirement Plans: Babel Street offers both a Traditional and Roth 401(K) with a very competitive match.
• Unlimited Flexible Leave: We trust our employees to manage their own time and balance their personal and work lives.
• Holidays: Babel Street provides employees with 12 paid Federal Holidays
• Tuition Reimbursement: We are committed to investing in our employees. One way we do that is with our Tuition Reimbursement Program for continuing education.                 

Babel Street is an equal opportunity/affirmative action employer. All qualified applicants will receive consideration for employment without regard to sex, gender identity, sexual orientation, race, color, religion, national origin, disability, protected Veteran status, age, or any other characteristic protected by law. Further, Babel Street will not discriminate against applicants for inquiring about, discussing or disclosing their pay or, in certain circumstances, the pay of their co‐worker, Pay Transparency Nondiscrimination. In addition, Babel Street's policy is to provide reasonable accommodation to qualified employees who have protected disabilities to the extent required by applicable laws, regulations and ordinances where a particular employee works. Upon request, we will provide you with more information about such accommodations.