Software Engineer , Query Execution

Overview

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.

Our global team is growing fast and is based in locations across North America and Europe. We support office‑based and remote work and align projects with convenient work hours for each time‑zone. 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.

We are looking for candidates based in Dublin for a hybrid working model.

• 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
• Experience in C++ and developing database systems is a plus
• Interest in the theory and practice of database query engines
• Hands‑on experience or M.Sc./Ph.D. in the domain is a plus

• 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

• Within one month: fixed a few bugs in a minor version of our latest release series
• Within three months: contributed to the development of a project slated for the next major version
• Within six months: taken on primary code review responsibilities and involved in reviewing the design for new features
• Within twelve months: making significant contributions to the development of a new major feature