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17 ir engineer jobs at 13 companies in Fairfield, CA

2mo
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Vision Systems Engineer
San Francisco, California, United States
OnsiteFull Time
Exploration Technology Group
Exploration Technology Group: Designs and builds hardware for space and defense missions.
5+ YOE5+ years in IR sensor systems, EO payloads, or space imaging; strong Kalman filtering, tracking, data association; CNNs/ML for real-time embedded inference; MATLAB/Python with production C++ experience.
Kalman filters (EKF, UKF), multi-target tracking, data association (JPDA, MHT), MATLAB, Python, C++, CNNs, embedded FPGA and GPU, radiometric modeling, Monte Carlo, hardware-in-the-loop
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7h
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Senior Security Engineer II
San Francisco, California, United States
$149k-$235k/yr HybridFull Time
Braze
BrazeNASDAQ: BRZE: Platform for personalized customer engagement and cross-channel messaging.
5+ YOESeveral years owning cloud security in production (including on-call), hands-on AWS and GCP, self-managed Kubernetes, Python and Terraform coding, detection/IR experience, and strong architecture and IAM skills.
AWS, GCP, Kubernetes, MongoDB, CrowdStrike, Tenable, Python, Terraform, SIEM
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2mo
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Senior Staff Applied AI Engineer - Context Retrieval
Mountain View or San Francisco
$229k-$343k/yr HybridFull Time
Databricks
Databricks: A unified platform for data analytics and artificial intelligence.
10+ YOE10+ years software engineering; deep IR and retrieval systems experience; expertise in LLM-era retrieval and agentic systems; experience building 0→1 retrieval stacks and multi-source data retrieval.
BM25, Lucene, Elasticsearch, OpenSearch, FAISS, ScaNN, HNSW, embeddings, nDCG, MRR, Recall@K, RAG, Python, Java, SQL
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1mo
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Applied Research Engineer
San Francisco, California, United States
$145k-$196k/yr HybridFull Time
Drata
Drata: Automated security and compliance platform for businesses.
3+ YOE3+ years in applied research, NLP/IR/ML; 1+ year production AI/ML; strong IR; RAG; Python; communicate findings.
Python, Jupyter Notebook, Vector databases, Information retrieval, RAG, LLM evaluation, ranking models, cross-encoders
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1mo
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Senior Applied Research Engineer 2
San Francisco, California, United States
$192k-$260k/yr HybridFull Time
Drata
Drata: Automated security and compliance platform for businesses.
6+ YOE6+ years in applied research/data science/ML (NLP/IR), 2+ years building/ shipping production AI, strong IR/RAG, Python, research-to-prod collaboration; bonus in compliance/docs domains.
Python, Vector databases, Embedding models, LLMs, RAG
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1mo
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Senior Applied Research Engineer
San Francisco, California, United States
$167k-$226k/yr HybridFull Time
Drata
Drata: Automated security and compliance platform for businesses.
5+ YOE5+ years in applied research, data science, or ML focusing on NLP/IR; 2+ years building production AI/ML systems; strong IR/RAG experience; Python proficiency; ability to communicate findings; bonus in compliance/doc-heavy domains.
Python, Jupyter, Vector Databases, LLMs, RAG, Cross-Encoders, Learning-to-Rank, Evaluation Metrics, Notebooks
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1mo
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Senior Research Engineer
San Francisco, California, United States
$175k-$250k/yr OnsiteFull Time
Mem0
Mem0: Provides persistent memory layers for artificial intelligence applications.
Experience with RAG/IR, model training and fine-tuning (LLMs/encoders), strong Python and PyTorch skills, familiarity with vLLM and serving frameworks, evaluation at scale, orchestration of low-latency data pipelines, and clear stakeholder communication.
Python, PyTorch, vLLM
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3mo
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Senior/Staff Software Engineer (Search & Retrieval)
New York or San Francisco
$160k-$220k/yr OnsiteFull Time
Actively AI
Actively AI: AI agents for automated enterprise revenue and sales operations.
5+ YOE5+ years in search or retrieval systems; strong IR or ML background; real-time indexing and hybrid retrieval; strong evaluation; holistic retrieval architecture.
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2w
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Security Engineer II
Dublin, California, United States
$125k-$213k/yr HybridFull Time
Ross Stores
Ross StoresNASDAQ: ROST: Discount retail chain selling brand-name apparel and home fashions
7+ YOE7+ years information security experience (5+ with a large organization). Strong knowledge of endpoint, cloud, SIEM, EDR/XDR/MDR, log management, threat detection/response and automation. BLS: bachelor's degree preferred or senior certification; strong analytical, organizational and project estimation skills.
Anti-virus/malware protection, Advanced Threat Protection, Log Collection & Analysis, User Behavior Analytics, Vulnerabilities Management, SIEM, EDR, XDR, MDR, IR, File Integrity Monitoring, Endpoint Security, mobile security
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1mo
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Staff Applied Research Engineer
San Francisco, California, United States
$221k-$299k/yr HybridFull Time
Drata
Drata: Automated security and compliance platform for businesses.
10+ YOE10+ years in applied research or ML; 2+ years producing AI/ML systems; strong IR/NLP knowledge; Python proficiency; experience communicating research; bonus in compliance domain.
Python, Vector databases, LLMs, RAG, Machine Learning
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2mo
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Senior Scientist I Analytical Development
South San Francisco, California, United States
$112k-$135k/yr OnsiteFull Time
Alumis
AlumisNASDAQ: ALMS: Develops precision medicines for patients with autoimmune diseases.
5+ YOEBS/MS in chemistry or pharmaceutical sciences with 5+ years in analytical development; experience with UPLC/HPLC, LC-MS, KF, dissolution; CMOs/CTLs; early to late-stage drug development.
UPLC, HPLC, LC-MS, KF, dissolution, IR, particle size analysis, solid-state characterization
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1w
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Manager III, Applied Science, PXT Central Science
Boston or Bellevue or Seattle or Arlington or San Francisco
$184k-$286k/yr OnsiteFull Time
Amazon
AmazonNASDAQ: AMZN: Global online retail and cloud computing technology provider.
3+ Mgmt3+ years managing scientists/ML engineers; deep ML, NLP, IR knowledge; experience with causal inference, building production ML systems, and leading hiring and talent strategy.
machine learning, NLP, Information Retrieval, computer vision, deep learning, large language models, LLMs, Generative AI
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3w
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Cost Segregation Manager
Portland or Irvine or Los Angeles or Orange County or San Francisco or Walnut Creek or Woodland Hills
$115k-$136k/yr RemoteFull Time
Aprio
Aprio: Provides business advisory, accounting, and tax services globally.
6+ YOEBachelor's in engineering (or related), 6+ years cost segregation experience, strong tax depreciation and IRS rule knowledge, leadership experience, up to 30% travel, excellent communication and analytical skills, proficiency with Microsoft Office and AI tools.
Microsoft Office, Claude, Copilot
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2mo
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Manager, Forensic Technology
San Francisco or Santa Clara
OnsiteFull Time
KPMG
KPMG: Global professional services network providing audit, tax, and advisory.
5+ YOE5+ years digital forensics/IR experience, bachelor’s in CS/engineering/forensics, DFIR tool proficiency, scripting/programming (Python,Rust,C++,C#,Java), relevant certifications, ability to travel, U.S. work authorization required.
Digital Forensics and Incident Response (DFIR), Python, Rust, C++, C#, Java, Artificial Intelligence (AI)
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2mo
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Senior Associate, Forensic Technology
Los Angeles or Sacramento or San Diego or San Francisco or Santa Clara or Washington or Chicago or New York or Dallas or Houston
OnsiteFull Time
KPMG
KPMG: Global professional services network providing audit, tax, and advisory.
3+ YOE3+ years digital forensics/IR experience, Bachelor\u0002s in CS/engineering/forensics or equivalent, DFIR investigations on iOS/macOS/Windows, scripting/programming (Python,Rust,C++,C#,Java), travel as needed, US work authorization required.
Digital Forensics and Incident Response (DFIR), Python, Rust, C++, C#, Java, Magnet, Cellebrite, Artificial Intelligence (AI)
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1w
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Senior Manager, SIRT
Seattle or San Francisco or Irvine
$175k-$272k/yr OnsiteFull Time
Twitch
TwitchNASDAQ: AMZN: Operates a global live streaming platform for interactive content.
5+ YOE5+ MgmtLead security incident response team; 5+ years managing incident handlers or 2+ years management plus 3+ years hands-on IR; experience with threat intelligence, detection engineering, cloud/host/network/app security, automation using scripting languages; strong communication.
Go, Python, Ruby, Bash
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2mo
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Chemistry - Graduates - AI Training - San Francisco, US
San Francisco, California, United States
$60/hr RemoteContract, Part Time
Prolific
Prolific: Platform connecting researchers and AI developers with verified participants.
Degree in chemistry/chemical engineering/biochemistry or related field, laboratory or industry experience, deep chemistry knowledge, familiarity with safety/GHS/SDS and regulatory frameworks, strong analytical and communication skills, and a PayPal account for payment.
SMILES, NMR, IR, Mass Spec, PayPal
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