Top Tech Jobs & Startup Jobs in San Francisco Bay Area, CA

Develop and fine-tune vision-centric large language models and visual encoders, build evaluation benchmarks, collect and prepare visual training data (including for RLHF), prototype architectures for production VLMs, publish research, and mentor junior researchers within a small applied ML research team.

Lead technical strategy and build production-scale ads ranking and bidding models using large-scale ML and agentic development loops. Design training, evaluation, and feedback pipelines that learn from online behavior and experimentation, ensure reliability, fairness, and compliance, and partner with product, science, and infra teams to drive metrics and mentor engineering talent.

Lead end-to-end technical delivery for advertiser and seller platforms, designing scalable, reliable APIs and data-intensive systems. Apply and integrate ML/GenAI with strong validation and guardrails, measure impact, partner cross-functionally, and mentor senior engineers to raise technical quality and production readiness.

Lead data-driven strategy for Pinterest Ads by translating business needs into analytical solutions, ensuring data quality, connecting product and financial performance, advising cross-functional leaders, and elevating data science practices across the organization.

Manage a portfolio of client accounts for a CTV ad-tech platform: launch, optimize, and analyze campaigns; drive revenue through upsell and retention; develop account plans; advise clients and agencies; collaborate with internal teams; mentor junior staff; and use AI and data to speed optimizations and deliver measurable ROAS.

Lead product design for Pinterest's Design Innovation team, evolving design language, creating high-quality, accessible experiences and prototypes, collaborating cross-functionally, mentoring designers, and exploring AI-powered interactions to drive product and system-level impact.

As a PhD Fall Machine Learning Intern at Pinterest, you will develop user features, conduct research in AI and ML, and gain experience in production ML systems while collaborating on recommendation systems and computer vision projects.

Manage full-cycle accounting for international subsidiaries including multi-currency journals, intercompany settlements and FX analysis. Drive automation-first initiatives and deploy AI-enabled workflows. Oversee statutory filings, local GAAP to US GAAP reconciliations, support audits, ensure SOX compliance, partner with FP&A and Treasury, and execute special projects.

Own quality for web platform features across UI, APIs, and backend services. Design and execute manual and exploratory tests, build and maintain automated test suites (frontend, API, contract testing), integrate tests into CI/CD, investigate failures, track defects, and advocate quality best practices.

Lead architecture and implementation of AI/ML production systems for Growth: APIs, data pipelines, evaluation and monitoring. Partner with ML/research teams to productize models, build cross-team foundations (eval, content quality, agent platforms), manage latency/cost/quality tradeoffs, ship at scale, and mentor engineers as a peer Staff IC.