Software Engineer 3

About the Role We’re looking for a Software Engineer 3 to help build the next-generation inference platform that supports embedding models used for semantic search, retrieval, and AI-native experiences in MongoDB Atlas. You’ll join the broader Search and AI Platform organization and collaborate with ML researchers and engineers from our Voyage.ai acquisition. Together, we’re building infrastructure for real-time, low-latency, and high-scale inference — fully integrated with Atlas and designed for developer-first experiences. As a Software Engineer 3, you’ll focus on building core systems and services that power model inference at scale. You’ll own key components of the infrastructure, work across teams to ensure tight integration with Atlas, and contribute to a platform designed for reliability, performance, and ease of use. This role is based in Palo Alto, CA or Seattle, WA with an in-office or hybrid work model. What You’ll Do Design and build components of a multi-tenant inference platform integrated directly with MongoDB Atlas, supporting semantic search and hybrid retrieval. Collaborate with AI engineers and researchers to productionize inference for embedding models and re‑rankers – enabling both batch and real‑time use cases. Contribute to platform capabilities such as latency‑aware routing, model versioning, health monitoring, and observability. Improve performance, autoscaling, GPU utilization, and resource efficiency in a cloud-native environment. Work across product, infrastructure, and ML teams to ensure the inference platform meets the scale, reliability, and latency demands of Atlas users. Gain hands‑on experience with tools like vLLM and container orchestration with Kubernetes. Who You Are 2+ years of experience building backend or infrastructure systems at scale. Strong software engineering skills in languages such as Go, Rust, Python, or C++, with an emphasis on performance and reliability. Experienced in cloud-native architectures, distributed systems, and multi-tenant service design. Familiar with concepts in ML model serving and inference runtimes, even if not directly deploying models. Knowledge of vector search systems (e.g., Faiss, HNSW, ScaNN) is a plus. Comfortable working across functional teams, including ML researchers, backend engineers, and platform teams. Motivated to work on systems integrated into MongoDB Atlas and used by thousands of developers. Nice to Have Experience integrating infrastructure with production ML workloads. Understanding of hybrid retrieval, prompt-driven systems, or retrieval-augmented generation (RAG). Contributions to open-source infrastructure for ML serving or search. MongoDB is committed to providing any necessary accommodations for individuals with disabilities within our application and interview process. To request an accommodation due to a disability, please inform your recruiter. 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. MongoDB’s base salary range for this role is posted below. Compensation at the time of offer is unique to each candidate and based on a variety of factors such as skill set, experience, qualifications, and work location. Salary is one part of MongoDB’s total compensation and benefits package. 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 below and the benefits in this paragraph are only applicable to U.S.-based candidates. $101,000—$198,000 USD #J-18808-Ljbffr