Software Engineer (Query Execution)
MongoDB
mid-level
Location
Cork, Ireland
Work Type
Onsite
Seniority
mid-level
Posted
July 17, 2026
Total Compensation
€160,000
Yearly Savings (Comfortable)
€38,000
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Job Description
- Join the MongoDB Server Query team, and help us build a world-class distributed open source query engine
- Our team plays a crucial role in the experience and performance of data processing
- We are responsible for the MongoDB Query Language and the lifecycle of each query, from parsing to optimization to plan selection and finally execution. This also includes our geospatial search and update subsystems
- We have tons of interesting problems to solve with direct impact on users for transactional, time-series and analytical workloads
- We need your help to design and build the heart of a distributed, flexible schema, document database
- Position Expectations:
- 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
- Success Measures:
- In one month, you’ll have fixed a few bugs in a minor version of our latest release series
- In three months you’ll have contributed to the development of a project slated for the next major version
- In six months, you’ll have taken on primary code review responsibilities and are involved in reviewing the design for new features
- In twelve months, you’re making significant contributions to the development of a new major features- Experience with large code bases
- B.Sc in Computer Science or similar field, or equivalent practical experience
- Interest in the theory and practice of database query engines. Hands-on experience or M.Sc./Ph.D in the domain is a plus
- Experience in C++ and in developing database systems is a plus
- Solid computer science fundamentals, with strong competencies in data structures, algorithms, and software design/architecture
- Hands-on experience building industrial-strength software
- 3+ years of experience in data intensive environments
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