Software Engineer 3 – Query Optimization

MongoDB is hiring a Software Engineer 3 – Query Optimization to join its Server Query team in Boston, Suffolk County, US. You will design, implement, and fine‑tune the core distributed query engine that powers MongoDB’s open‑source database.

Key Responsibilities

• Develop and maintain the MongoDB Query Language parser, optimizer, and execution planner.
• Design algorithms for cost‑based optimization, plan selection, and runtime execution across distributed clusters.
• Enhance geospatial search, update subsystems, and other specialized query features.
• Collaborate with cross‑functional teams (storage, networking, security) to ensure end‑to‑end performance.
• Write high‑quality, test‑driven C++ code and contribute to open‑source components.
• Participate in code reviews, performance profiling, and debugging of production issues.

Required Qualifications

• Bachelor’s or higher in Computer Science, Engineering, or related field.
• 5+ years of professional software development experience, primarily in C++.
• Strong understanding of query processing, compiler techniques, and distributed systems.
• Experience with database internals, query optimizers, or similar complex systems.
• Proficiency in Linux development environments and version control (Git).

Preferred Skills

• Graduate degree or research experience in databases, compilers, or algorithms.
• Familiarity with MongoDB, other NoSQL/SQL databases, or open‑source query engines.
• Knowledge of profiling tools, benchmarking, and performance tuning.
• Experience with geospatial indexing and search algorithms.

What We Offer

• Competitive salary of $103,615.37 per year.
• Comprehensive health, dental, and vision benefits.
• Generous paid time off and flexible work arrangements.
• Opportunities for career growth within a fast‑expanding global team.

Frequently Asked Questions

What does a Software Engineer 3 – Query Optimization do at MongoDB?

You will design, implement, and optimize the core query processing pipeline, including parsing, optimization, plan selection, and execution for MongoDB’s distributed database.

What experience is required for this role?

At least 5 years of professional C++ development, strong knowledge of query processing, compilers, and distributed systems, plus a degree in Computer Science or a related field.

What are the benefits of working at MongoDB in Boston?

MongoDB offers a competitive salary, comprehensive health benefits, flexible work options, generous PTO, and strong career advancement opportunities within a global team.