# Software Engineer 3 - Query Optimization

**Company:** [MongoDB](https://hotfix.jobs/companies/mongodb)
**Location:** Atlanta, GA, Boston, MA, New York, NY
**Role:** Backend Engineering
**Salary:** $106k – $209k/yr
**Experience:** 3+ years
**Skills:** Query Optimization, Database Systems, Data Structures, Algorithms, Software Design, Software Architecture, Large Codebases, Query Engines, Performance Tuning, Distributed Systems
**Posted:** 2026-05-20

> Build and optimize MongoDB's distributed query engine, focusing on query parsing, optimization, plan selection, and execution for transactional, time-series, and analytical workloads. Requires 3+ years in data-intensive environments and strong CS fundamentals.

## Job Description

## Responsibilities
- Understand and improve current functionality of the MongoDB query engine
- Identify, design, implement, test, and support new features related to query performance and robustness, query language enhancements, diagnostics for query performance problems, and integration with other products and tools
- Work with other engineers to coordinate seamless changes in a feature-rich, large code base
- Work with other teams including client drivers, cloud services, enterprise tools, support, consulting, education, and marketing to coordinate changes or contribute to their projects

## Requirements
- 3+ years of experience in data intensive environments
- Hands-on experience building industrial-strength software
- Solid computer science fundamentals, with strong competencies in data structures, algorithms, and software design/architecture
- Experience with large code bases
- B.Sc in Computer Science or similar field, or equivalent practical experience

## Nice-to-Haves
- Experience in developing database systems
- Interest in the theory and practice of database query engines; hands-on experience or M.Sc./Ph.D in the domain is a plus

## Success Measures
- In three months: contributed to the development of a project slated for the next major version, as well as fixed a few bugs in a minor version of the latest stable release series
- In six months: taken on code review responsibilities and involved in reviewing the design for new features
- In twelve months: making significant contributions to the development of a new major features

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