Software Engineer 3, Atlas Vector Search

Join the Vector Search team and help build a cutting-edge vector database on top of MongoDB. Our team is responsible for the syntax and implementation of MongoDB’s $vectorSearch aggregation, which enables approximate nearest neighbor queries over high‑dimensional vectors.

We are a small team with a large and rapidly growing customer base, providing engineers an opportunity to make a highly‑visible, broad impact. When scaling search to billions of vectors, performance is paramount. We’re looking for engineers who enjoy solving complex and open‑ended problems that directly impact users’ performance.

This role is based in San Francisco, CA with a hybrid work model.

Responsibilities

Implement new features within MongoDB’s $search and $vectorSearch aggregation operators

Work cross‑functionally with product teams to define new query and index syntax

Identify and address performance bottlenecks in filter queries and nearest‑neighbor search

Lead projects and own subsystems

Perform code reviews with peers, review technical designs, and mentor junior developers

Qualifications

3+ years of experience working on large‑scale back‑end systems

Experience writing high‑performance applications in Java or another JVM language

A growth mindset and the desire to learn quickly through taking on challenges, reflecting on outcomes, and incorporating feedback

Passionate about optimization, code quality, and problem solving

Bonus: experience with Apache Lucene, vector databases, or high‑throughput web services

Success Measures

In 3 months you’ll have a solid high‑level understanding of what our team does and how we operate

You’ll have contributed to the development of an existing project and completed several small improvements or bug fixes

In 6 months you’ll be reviewing code and project designs, and be an active participant in team meetings

In 12 months you’ll have a thorough understanding of the systems our team owns and have led a small project. You’ll have proposed small improvements to our code, product, or team processes

Benefits
MongoDB’s base salary range for this role is $109,000—$215,000 USD. Other benefits for eligible employees may include equity, participation in the employee stock purchase program, flexible paid time off, 20 weeks fully‑paid gender‑neutral parental leave, fertility and adoption assistance, 401(k) plan, mental health counseling, access to transgender‑inclusive health insurance coverage, and health benefits offerings. Please note, the base salary range listed is only applicable to U.S.‑based candidates.

MongoDB, Inc. provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type and makes all hiring decisions without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws.

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