Senior Machine Learning Engineer, Features

Cognitiv; San Mateo (CA); Hybrid; USD 190,000 - 250,000; Full time

Benefits offered by this job

Medical, Dental and Vision

Unlimited PTO

Work-From-Anywhere August

Equity for all employees

Hybrid work model

Job summary

Cognitiv is a leading AdTech company in San Mateo, CA, seeking a senior ML infrastructure engineer to own and evolve data platforms, feature pipelines, and training systems. You will collaborate across engineering, data science, and infrastructure teams on scalable, low-latency solutions that power real-time bidding and AI-driven advertising.

Join Cognitiv to shape feature pipelines, optimize training workloads, and deliver robust, observable platforms with a hybrid work schedule.

Qualifications

• 3-5+ years of hands-on ML infrastructure / data platform experience supporting data-intensive platforms.
• Proficiency in Python, Java, or Scala for building and scaling ML/data pipelines.
• Strong expertise with Spark, Flink, Kafka, and other distributed data processing frameworks.
• Excellent team communication and cross-functional collaboration.
• Willing to work onsite Monday-Wednesday in San Mateo, CA.

Responsibilities

• High-Performance feature engineering & infrastructure for real-time and batch pipelines.
• Advanced embeddings & generative AI integration for core feature store and serving system.
• Model training pipeline optimization to improve speed and throughput.
• Establish monitoring, testing, and CI/CD standards across feature and training infra.
• Collaborate with Modeling & Data Science to translate signals into production features.

Skills

Machine Learning Infrastructure

Python

Java

Scala

Spark

Flink

Kafka

Distributed Systems

Team Collaboration

Tools

PyTorch

Kubernetes

Docker

AWS

GCP

Job description

Domain expertise in AdTech.

Are you ready to revolutionize the advertising industry?

At Cognitiv, we are not just another AdTech company—we are industry trailblazers redefining media buying with our Deep Learning Advertising Platform. Since 2015, we have harnessed the power of cutting-edge deep learning technology and data science to transform how brands connect with their customers. Our mission? To bring intelligence to advertising and deliver unparalleled precision, relevance, and impact at scale.

With our innovative platform, advertisers enjoy unprecedented flexibility—whether it is activating Dynamic Deals through their preferred DSP, leveraging our managed service DSP, or utilizing our industry-first ContextGPT product. As a part of Cognitiv, you will be at the forefront of AI-driven advertising solutions, driving change and achieving remarkable growth in a rapidly evolving industry.

Now, we’re growing!

In this role, you will work at the intersection of large-scale distributed systems, machine learning engineering, and platform architecture. You will own and evolve critical data capabilities within Cognitiv’s advertising ecosystem, with a primary focus on designing and delivering stable, highly scalable feature pipelines, as well as optimizing the performance and reliability of ad model training pipelines.

This is a senior individual-contributor role for an engineer who thrives on solving complex platform problems, raising the technical bar, and building systems that serve many teams at scale. You will partner closely with engineers, product managers, data scientists, infrastructure teams, and downstream data consumers to deliver platforms that are resilient, extensible, and easy to adopt.

This position will be located in San Mateo, CA with a hybrid work schedule of 3 days in office (Mon/Tue/Wed) and 2 days remote optional (Thursday/Friday).

What You\'ll Do

• High-Performance Feature Engineering & Infrastructure: Architect, build, and maintain low-latency, high-throughput feature pipelines — batch, real-time streaming, and point-in-time correct historical features — to power our real-time bidding systems.
• Advanced Embeddings & Generative AI Integration: Leverage LLMs and deep learning models to extract rich contextual and user-level embeddings into the core feature store/serving system, optimizing embedding generation, indexing, and online retrieval for sub-millisecond serving SLAs.
• Model Training Pipeline Optimization: Own and continuously enhance Cognitiv\'s ad model training pipelines, improving training speed, resource utilization, and throughput for large-scale deep learning models.
• System Scalability, Reliability & Efficiency: Establish technical standards for monitoring, testing, and CI/CD across feature and training infrastructure to ensure robust system SLAs/SLOs.
• Partner with Modeling & Data Science: Translate complex signals into production-ready features that directly boost model performance (e.g., CTR/CVR prediction).

Who You Are
Must haves:

• 3-5+ years of hands-on Machine Learning Infrastructure / Data Platform experience supporting data-intensive platforms, including large-scale data pipelines, streaming systems, and storage layers.
• Proficiency in one or more core programming languages — Python, Java, or Scala — for building, maintaining, and scaling robust ML and data pipelines.
• Strong expertise in modern big data technologies such as Apache Spark, Apache Flink, Apache Kafka, and other distributed data processing frameworks.
• Excellent team communication, cross-functional collaboration, and problem-solving skills, with a track record of partnering effectively with modeling and engineering teams.
• Willing to work onsite Monday/Tuesday/Wednesday in San Mateo, CA.

Nice To Haves

• Domain expertise in AdTech.
• Hands-on experience with PyTorch for model architecture, training pipeline acceleration, or distributed training.
• Proficiency with cloud & infrastructure technologies, including AWS/GCP, as well as containerization and orchestration platforms like Kubernetes (K8s) and Docker.
• Competitive programming background, such as awards or achievements in OI (Olympiad in Informatics) or ACM/ICPC.

Tech Stack: Python, Java, Kafka, Flink, Spark, PyTorch, Kubernetes, AWS

First 30 Days
What Success Looks Like in Your First 30/60/90 Days

• Ramp quickly on Cognitiv\'s feature pipelines, training infrastructure, and RTB systems.
• Build strong context on current architecture, data flows, and known bottlenecks.
• Establish relationships with Modeling, Data Science, and Infrastructure teams.
• Identify early opportunities to improve pipeline reliability, training efficiency, or serving latency.

First 60 Days

• Independently own at least one core feature pipeline, embedding service, or training subsystem.
• Ship a first measurable improvement — e.g., reduced serving latency, faster training throughput, or expanded monitoring/CI-CD coverage.
• Align with Modeling and Data Science on the feature and training roadmap.
• Begin influencing technical direction for feature and training infrastructure.

First 90 Days

• Fully own a core area of the platform, such as embedding generation/retrieval, streaming infrastructure, or training pipeline performance.
• Deliver measurable business impact — e.g., reduced feature or serving latency, faster model training, or improved uptime/SLA adherence.
• Redesign or scale at least one key system to handle growing data volume or model complexity.
• Operate autonomously as a trusted technical partner to Modeling, Data Science, and Engineering.

Salary: $190,000-$250,000 USD Base Salary + Equity

What We Offer
Compensation is based on experience, skills, and other factors. Base salary is just one part of your total rewards at Cognitiv—you’ll also receive equity and a comprehensive benefits package.

Highlights Include

• Medical, Dental and Vision plan for US employees & Extended Health Benefits for Canadian employees
• 12 weeks paid parental leave + 4 weeks WFH
• Unlimited PTO + Work-From-Anywhere August
• Career development with clear advancement paths
• Equity for all employees
• Hybrid work model & daily team lunch
• Health & wellness stipend + cell phone reimbursement
• 401(k) & RRSP with employer match
• Parking (CA, WA, Vancouver offices) & pre-tax commuter benefits
• Employee Assistance Program
• Comprehensive onboarding (Cognitiv University)
• …and more!

What You’ll Find at Cognitiv

• Festiv – We make work fun with cross-team games, events, and creative team bonding.
• Responsiv – You’ll be close to clients and leadership, influencing real outcomes.
• Inclusiv – Diversity and individuality are celebrated across all levels.
• Inventiv – We reward curiosity and embrace bold ideas.
• Transformativ – We support your growth with training, mentorship, and flexibility.
• Collaborativ – We operate across coasts, connected by purpose and teamwork.

Cognitiv is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive workplace for all.

Note on AI Use: Cognitiv may use AI technology to assist with certain administrative aspects of the hiring process, such as note-taking, interview documentation, and reporting. However, every resume and application is reviewed directly by our recruiting team. AI tools are used solely for operational support and do not influence candidate evaluation or hiring decisions.