Senior Fullstack Software Engineer, Startpage

• Design, build and ship features end to end, from API and data model through to the UI
• Drive your work with AI coding agents: give them the tools, context and guardrails they need, run them in loops against a spec, orchestrate several agents in parallel on one problem, and review what they produce with a critical eye
• Turn interactive prototypes from product into production code, keeping the intent and cutting what does not hold up
• Own services in production on Kubernetes: deploys, monitoring, the on-call rotation, and the latency and uptime targets a search product demands
• Shape architecture decisions and lead tech-debt reduction so the codebase stays fast to change
• Protect user privacy in every design decision: no tracking, minimal data retention, and no third-party calls that leak queries
• Write automated tests as a matter of course
• Instrument features and read your own results in Sigma and Snowflake; propose the next iteration from the data
• Work with outside partners and agencies so web and app experiences stay consistent
• Write clear tickets, PRs and design notes; review teammates’ work the same day, * Small North America-based team, weekly releases
• Product work starts as a clickable prototype; engineers are expected to push back on it before building
• Agents do the typing; engineers own the architecture, the review and the outcome
• Data over opinion: every feature ships with instrumentation and a success metric
• Jira for tracking, GitHub for code, Sigma and Snowflake for analytics, Slack for the day to day

• Daily, hands-on use of agentic coding tools: you can run agents in loops, write the evals that keep them honest, coordinate multi-agent workflows, and know when to take the keyboard back
• 5+ years of professional web development, owning both frontend and backend in production
• Strong Python, plus JavaScript or TypeScript, React, and modern CSS and HTML
• Hands-on with Docker, Kubernetes, Helm and Redis
• CI/CD and monitoring tooling, and AWS or a comparable cloud platform; comfortable being paged for what you ship
• Solid automated testing habits
• SQL fluency and the habit of checking your own feature’s numbers after launch
• Care for performance: you know what a 100 ms regression costs on a search results page
• Clear written communication with a distributed team and outside vendors, * Desktop browser or mobile app experience, especially Chromium, Electron or a shipped native app
• Prior search or privacy product experience
• Ads or recommendations systems, especially serving ML models at low latency
• Bot detection, fraud or abuse prevention
• SEO-driven site generation at scale
• Familiarity with EU privacy regulation

• Competitive salary + bonus + equity
• Generous PTO + 11 company holidays
• Open sick time
• 100% covered Medical, Dental, Vision for employees
• 401k with match
• Health & Dependent Care Flex Spending Account
• Paid professional development
• Leadership & growth opportunities
• Virtual company and team building events

The U.S. base salary range for this full-time position is $133,000 - $183,000 + bonus + equity + benefits. Our salary ranges are determined by role, level, and location. The range displayed on each job posting reflects the minimum and maximum target for new hire salaries for the position across all US locations. Within the range, individual pay is determined by work location and additional factors, including job-related skills, experience, and relevant education or training. Your recruiter can share more about the specific salary range for your preferred location during the hiring process. Please note that the compensation details listed in U.S. role postings reflect the base salary only, and do not include bonus, equity, or benefits. System1’s headquarters is located in Marina del Rey, CA with an additional office in Bellevue, WA.