Senior AI/ML Engineer
Company: Vectra
Location: Campbell
Posted on: January 21, 2026
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Job Description:
We’re an early-stage startup on a mission to reinvent
cybersecurity with AI-native infrastructure. Our vision is to help
defenders move faster than adversaries by combining large-scale
data, modern AI, and intelligent automation. We’re backed by
top-tier investors and working with design partners across critical
infrastructure and enterprise security. If you’re excited about
building from the ground up and shaping the future of AI in
cybersecurity, we’d love to talk. We are hiring multiple AI/ML
Engineering positions at various levels of seniority. This is a
hybrid role with the expectation of working in our San Jose office
3 days per week. About the Role We’re hiring an AI/ML Engineer to
design, build, and deploy machine learning systems at the heart of
our platform. You’ll work on problems like dynamic threat
detection, LLM-powered agent reasoning, RAG pipelines, and
adversarial behavior modeling. You’ll collaborate across research,
backend, and security teams to ship high-impact features fast. If
youre a hands-on ML engineer who loves shipping smart systems in
messy real-world domains, this is for you. What You’ll Do • Build
and fine-tune models for threat detection, anomaly detection, and
behavioral modeling (supervised, unsupervised, and
semi-supervised). • Implement and optimize LLM-powered agents that
reason over structured and unstructured security data. • Develop
RAG pipelines that combine embeddings, vector search, and context
injection. • Work with streaming and historical security data
(logs, events, alerts) to train and evaluate models. • Collaborate
with backend and platform teams to deploy models in scalable,
low-latency environments. • Continuously improve model performance,
robustness, and explainability. What We’re Looking For • 3 years of
hands-on experience in applied ML or MLOps (or PhD with practical
implementation). • Strong ML fundamentals (classification,
clustering, anomaly detection, embedding techniques). • Experience
working with real-world noisy data, ideally in time series, logs,
or graph-structured form. • Experience with LLMs (e.g., OpenAI,
Mistral, Llama), embeddings, and vector databases. Well-versed in
techniques for long context (chunking, sliding window, hierarchical
summarization). • Solid skills in Python, PyTorch or TensorFlow,
and ML pipelines. • Strong collaboration and ownership mindset—you
write clean code, ask great questions, and iterate quickly. •
Someone who is looking for a hybrid work environment, with a
minimum of 3 days in the San Jose office. Nice to Have •
Familiarity with cybersecurity data (SIEM logs, alerts, EDR
telemetry, threat reports). • Experience with agent frameworks
(LangChain, AutoGen, CrewAI) and agent protocols. • Exposure to
adversarial machine learning or explainability techniques. • Infra
skills for ML (Docker, K8s, GPU scheduling, model serving). Why
Join Us? • Founding-level equity and full-stack ownership. • Work
on hard, meaningful problems at the intersection of AI and
security. • High agency, fast learning, direct access to customers
and users. • Backed by seasoned operators and security leaders.
Keywords: Vectra, San Ramon , Senior AI/ML Engineer, IT / Software / Systems , Campbell, California
