Role Overview

Join the MongoDB Query Execution Team as a Senior Software Engineer, Query Execution in Dublin, Ireland. This is your chance to develop a fast, modular distributed query system powering critical workloads for nearly 60,000 customers, including 75% of the Fortune 100. Work on execution algorithms, new query language features, performance tuning, and more. Based in our Dublin office or remotely in Ireland, you'll contribute to MongoDB Atlas, the leading cloud-native, multi-cloud database across AWS, Google Cloud, and Azure.

MongoDB is redefining databases for the AI era, enabling innovators to modernize legacy systems and unleash AI applications. As a modern developer data platform, MongoDB empowers rapid innovation at market speed. This role offers hands-on impact on NoSQL database technology used by AI-native startups and enterprises worldwide.

Key Responsibilities at MongoDB

• Understand and improve current functionality of the MongoDB query engine for optimal performance.
• Contribute high-quality C++ code and actively give/receive feedback in code reviews.
• Identify, design, implement, test, and support new features for query performance and robustness.
• Build query language enhancements and diagnostics for performance issues.
• Integrate query systems with other MongoDB products, tools, and distributed systems.
• Tune database performance to support customers' most critical workloads.
• Work constructively with peers to deliver excellent technical solutions.
• Lead major feature development and mentor new engineers within 12 months.
• Fix bugs in stable releases and contribute to upcoming major versions.

Qualifications & Requirements

• 5+ years in systems programming, building industrial-strength software.
• Experience with large codebases in C++, C, Rust, or similar compiled languages.
• Solid CS fundamentals: data structures, algorithms, software design/architecture.
• Database or data management systems experience (huge plus, not required).
• B.Sc in Computer Science or equivalent practical experience.
• Interest in database query engines; hands-on experience or M.Sc./Ph.D a plus.

Success measures include contributing to major releases in 3 months, independent delivery in 6 months, and leading features/mentoring in 12 months.

Salary & Benefits

Competitive salary estimated at $120,000 - $180,000 USD base (adjusted for Ireland market), plus equity. Enjoy Competitive Equity, Wellness Programs, MongoDB University courses, Global Family Leave, fertility assistance, parental leave, affinity groups, and more. MongoDB commits to employee wellbeing, supportive culture, and accommodations for disabilities. As an equal opportunity employer, we foster diversity and inclusion.

Why Join MongoDB?

MongoDB is the most widely available, globally distributed database, powering the next era of software. With offices worldwide and a Leadership Commitment guiding decisions, we prioritize innovation, collaboration, and impact. Work on cutting-edge NoSQL, query optimization, and distributed query systems that disrupt industries.

Our cloud-native MongoDB Atlas supports multi-cloud deployments, helping organizations embrace AI and modernize workloads. Join a team where your C++ expertise drives real-world change for Fortune 100 companies and startups. Experience a enriching culture with personal growth opportunities, from code reviews to leading major features.

Dublin offers vibrant tech hub vibes, or go fully remote in Ireland. Be part of redefining databases for the AI era—apply now to power innovation at MongoDB!

How to Apply

Ready to build the future of MongoDB query execution? Submit your application with REQ ID: 4263321371. Highlight your C++ systems programming, database experience, and passion for query engines. Our recruiters will contact you for next steps, including accommodations if needed. Don't miss this Senior Software Engineer role in Dublin—apply today and join MongoDB's mission to empower innovators worldwide.

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