Joblaze summary

The Senior Software Engineer at MongoDB focuses on enhancing the performance and reliability of the distributed query system, engaging in tasks such as implementing execution algorithms and developing new query language features. Proficiency in C++ and a solid understanding of data structures and algorithms are essential, along with experience in systems programming. This role is ideal for seasoned engineers with a background in software development, particularly those interested in database technologies. MongoDB fosters a collaborative environment, emphasizing personal growth and a supportive culture.

Joblaze insights

Listed about 3 months ago — first seen on Joblaze July 15, 2026. Last confirmed on MongoDB's careers page October 30, 2026.
This exact title is also open at 5 other locations at MongoDB: Belgium, Bulgaria, Netherlands, Spain, Sweden.

Quick facts

Is the Senior Software Engineer, Query Execution role remote?: It's hybrid — MongoDB expects some on-site time in Ireland.
How much experience is required?: At least 5 years of relevant experience for this Senior Software Engineer, Query Execution role.
Where is the role based?: MongoDB is hiring for this position in Ireland.
What's the tech stack?: Joblaze extracted these technologies from the posting: C, C++, Rust.
Does MongoDB sponsor work visas for this role?: Yes — the posting indicates visa sponsorship is available for the right candidate.
What seniority level is this role?: MongoDB targets senior candidates for this position.
Is this full-time or contract?: Full-time for this Senior Software Engineer, Query Execution role at MongoDB.

From the original posting

The MongoDB Query Execution Team is hiring software engineers who want to join us in developing a high performing, reliable and modular distributed query system. Our engineers work on implementing and maintaining execution algorithms, building new query language features, tuning database performance, and more to power our customers' critical workloads.

This role can be based out of our Dublin office or remotely in Ireland. Relocation can be supported.

Position Expectations

Understand and improve current functionality of the MongoDB query engine
Contribute high quality C++ code and give and solicit feedback in code reviews
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 constructively with peers to deliver excellent technical solutions

Candidate Profile

5+ years of experience in systems programming

Experience in databases and/or data management systems is a huge plus, but not a requirement

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, preferably in C++, C, Rust or a similar compiled language
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

Success Measures

In three months you’ll have 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 our latest stable release series
In six months, you’ll have taken on code review responsibilities and are independently delivering complex functionality and squashing bugs independently
In twelve months, you’re leading the development of a new major feature and are helping to mentor new engineers on the team

MongoDB is an equal opportunities employer.

Req ID: 2273491237

Standard company text repeated across MongoDB's postings is omitted here.

Senior Software Engineer, Query Execution

Position Expectations

Candidate Profile

Success Measures

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