Senior Fullstack Software Engineer, Startpage

System1•Los Angeles, CA

3d•$133,000 - $183,000•Onsite

About The Position

Startpage is expanding beyond search results into broader consumer products for people who want privacy without sacrificing a modern experience. The Senior Fullstack Software Engineer will join the small, North America-based Startpage Consumer team and own features from first commit through production across the web frontend, backend services, and data pipeline. The role involves shaping architecture as the product grows and reducing technical debt. The team ships weekly, bringing work to millions of monthly users within days. The engineer will work across new desktop and web consumer products, the search results page, real-time decisioning, the homepage and engagement features, traffic quality and abuse prevention, and data instrumentation and reporting. This is an onsite role at the headquarters at 4235 Redwood Ave., Los Angeles, CA 90066. The team uses AI coding agents as a core part of its engineering work; engineers direct and evaluate agent output while owning architecture, reviews, and outcomes.

Requirements

Daily, hands-on use of agentic coding tools, including running agents in loops, writing evaluations, coordinating multi-agent workflows, and knowing when to take over manually.
At least 5 years of professional web development experience, with production ownership across both frontend and backend.
Strong Python skills, plus JavaScript or TypeScript, React, and modern CSS and HTML.
Hands-on experience with Docker, Kubernetes, Helm, and Redis.
Experience with CI/CD and monitoring tooling, and AWS or a comparable cloud platform; willingness to be paged for systems shipped.
Solid automated testing habits.
SQL fluency and a habit of checking feature metrics after launch.
Clear written communication with a distributed team and outside vendors.
Care for performance, including understanding the impact of a 100 ms regression on a search results page.

Nice To Haves

Desktop browser or mobile app experience, especially Chromium, Electron, or a shipped native app.
Prior search or privacy product experience.
Experience with advertising or recommendation systems, especially serving machine-learning models at low latency.
Experience with bot detection, fraud, or abuse prevention.
Experience with SEO-driven site generation at scale.
Familiarity with EU privacy regulation.

Responsibilities

Design, build, and ship features end to end, from APIs and data models through to the user interface.
Use AI coding agents by providing tools, context, and guardrails; run agents in loops against specifications; coordinate agents in parallel; and critically review their output.
Turn interactive product prototypes into production code while preserving their intent and removing elements that do not hold up.
Own production services on Kubernetes, including deployments, monitoring, participation in the on-call rotation, and meeting latency and uptime targets.
Shape architecture decisions and lead technical-debt reduction to keep the codebase easy to change.
Protect user privacy through design decisions, including avoiding tracking, minimizing data retention, and preventing third-party calls from leaking queries.
Write automated tests.
Instrument features, review results in Sigma and Snowflake, and propose iterations based on data.
Work with external partners and agencies to keep web and app experiences consistent.
Write clear tickets, pull requests, and design notes, and review teammates' work the same day.