Senior Software Engineer (Server Networking Security, Rust)

MongoDB; Ireland; On-site; EUR 110,000 - 140,000; Full time

Job summary

MongoDB is seeking a Senior Engineer for the Server Ingress Security team in Ireland. You will design and implement security services in Rust, focusing on correctness, performance, and operability, while building Atlas Network Protection layer security features.

You will collaborate with Server, Atlas, Drivers, SRE, and Product Security teams to ensure integration with the MongoDB ecosystem and help define the team's roadmap.

Qualifications

• Excellent verbal and written technical communication; collaborate effectively.
• Understanding of network protocols, TLS, and connection lifecycle.
• 5+ years building production-quality systems in Rust; backend experience preferred.
• Strong systems fundamentals: multithreading and performance profiling.
• Experience with security-sensitive domains is a plus.

Responsibilities

• Design, implement, and operate production-ready security services in Rust with a focus on security and performance.
• Develop ingress networking and security solutions for database service reliability.
• Diagnose test failures and performance regressions and implement fixes.
• Lead development and project management for features within the Ingress Security domain.
• Collaborate with Server, Atlas, Drivers, SRE, and Product Security teams for seamless integration.
• Collaborate with Product Management and Engineering leadership to define the team's roadmap.

Skills

Technical communication

TLS / network protocols

Multithreading

Rust

Performance profiling

Security concepts

High availability

Education

B.Sc. in Computer Science or related field

Job description

Overview

Come join the Server Ingress Security team, where we are rearchitecting MongoDB Server’s ingress networking to make MongoDB clusters even more secure. This new team is building the Atlas Network Protection layer, a set of performant, security‑critical services that harden MongoDB’s pre‑authentication attack surface and provides the ability to respond rapidly to emergent threats. We are looking for talented Senior Engineers to join the team and be founding members, where you will play a crucial role in our multi‑year roadmap. Our team champions a strong culture of inclusivity, diversity, and collaboration. If you want to work on a collaborative team that applies security and systems engineering fundamentals to protect a popular database at scale, join us!

Responsibilities

• Design, implement, and operate production‑ready security services in Rust, with a focus on security, correctness, performance, and operational excellence.
• Develop ingress networking and security solutions that ensure the security, availability, and performance of a database service.
• Diagnose test failures and performance regressions, and implement fixes.
• Lead development and project management for features and initiatives within the Ingress Security domain.
• Collaborate across Server, Atlas, Drivers, SRE, and Product Security teams to ensure the Atlas Network Protection layer integrates seamlessly with the broader MongoDB ecosystem.
• Collaborate with Product Management and Engineering leadership to define the team’s roadmap.

Success Measures

1. In the first month: Understand the high‑level architecture of the Atlas Network Protection layer, set up your development environment, and resolve a few bugs.
2. In three months: Contribute substantially to the Rust development of a current project or milestone, take on code review responsibilities, and participate in reviewing designs for new features.
3. In six months: Independently lead the development of a new feature and help mentor new engineers on the team.
4. In twelve months: Drive significant improvements to the security, performance, or operational capabilities of the Ingress Security stack, and contribute to the long‑term technical roadmap of the team.

Qualifications

• Excellent verbal and written technical communication skills, with a strong desire to collaborate with colleagues.
• Understanding of network protocols, TLS, and connection lifecycle management.
• Bonus points for experience working hands‑on in security‑sensitive or networking‑adjacent domains.
• Strong time management skills and the ability to realistically assess project complexity.
• Experience with large backend/compiled codebases and performance‑sensitive software, preferably in Rust.
• Strong systems fundamentals, including multi‑threaded programming and performance profiling.
• Bonus points: familiarity with security concepts such as attack surface reduction, input validation, memory safety, and defense‑in‑depth architectures.
• 5+ years of experience building production‑quality systems software.
• B.Sc. in Computer Science or a related field, or equivalent practical experience, with strong competencies in data structures, algorithms, and software design/architecture.
• Interest in the theory and practice of high‑availability, security‑critical systems.