Sr Full Stack Engineer

What you’ll do

• Own features end-to-end: from API design and database migrations through React UI and data visualization, all the way to monitoring and on-call support
• Build and harden integrations with third-party ad platforms (Meta, Google, TikTok) — design for reliability across APIs you don’t control
• Evolve and modernize a production Flask + React application that serves hundreds of customers — improve architecture incrementally while shipping continuously
• Design and build data-rich UIs: charts, dashboards, and interactive tools that help marketers understand complex experimental results
• Collaborate closely with scientists and data engineers to translate statistical outputs into product experiences customers can act on
• Use AI development tools as part of your daily workflow to accelerate delivery, explore solutions, and raise the ceiling on what you can ship
• Participate in on-call rotation and own the operational health of the systems you build
• Review code across the team and help set the bar for quality, clarity, and maintainability

Qualifications

• 5–10+ years of experience building and shipping production web applications and APIs
• Strong across the full stack: you can build a well-structured API endpoint, write a database migration, and implement the frontend that consumes it
• Proficiency in Python and React (or strong equivalents with willingness to ramp); experience with Flask, SQLAlchemy, or similar frameworks is a plus
• Experience working in and improving large, established codebases — you’ve navigated legacy systems, made pragmatic tradeoffs between refactoring and shipping, and left things better than you found them
• Comfort with cloud-native environments (GCP preferred): you understand how to deploy, monitor, and operate services in production
• Experience with relational databases (MySQL/PostgreSQL) and data-heavy applications
• Track record of working effectively with AI development tools (Claude, Cursor, Copilot, or similar) — you’ve integrated them into your workflow and can articulate how they change the way you build software
• Strong product sense: you think about what customers need, not just what the ticket says
• Excellent communication skills — you can explain technical tradeoffs clearly and work effectively with scientists, product managers, and other engineers

For Staff level

• Demonstrated ability to lead technical direction for a system or product area, making architectural decisions that hold up as the team and product scale
• Experience driving cross-team or cross-system initiatives — you’ve coordinated changes across multiple services or repositories and managed the sequencing
• A track record of mentoring other engineers and raising the technical bar of the team through code review, design guidance, and leading by example
• Comfort operating with ambiguity: you can take a loosely defined problem, break it down, build the plan, and drive it to completion without heavy oversight

Bonus Points

• Earlier stage startup experience
• Experience with ad platform APIs (Meta Marketing API, Google Ads API)
• Experience with data visualization or experimentation platforms
• Experience with third-party data integrations and ETL workflows

What We Offer

• Flexible PTO
• Equity
• Top of the line health, dental, and vision insurance
• WFH stipend
• Events & Offsites
• Free Lunch (SF, NYC, Seattle offices)
• New Parent Leave