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Mixpanel is a leading product intelligence and analytics platform trusted by over 29,000 companies. The Experimentation team owns products that help teams test, ship, and observe their work: Experiments, Feature Flags, Session Replay, and Heatmaps. These products extend Mixpanel from understanding user behavior to acting on it, and are central to the company's growth strategy.
As a Senior Software Engineer on this team, you will own the technical design and delivery of features across the full stack—from React frontend experiences to Python backend services to high-throughput systems like flag evaluation and replay ingestion. You'll work on a small, senior team with significant influence over the technical direction of products critical to Mixpanel's growth.
Key responsibilities include:
- Own technical design for complex features end to end, from backend services and data models to frontend experiences
- Make well-reasoned technical decisions balancing speed, quality, cost, and product considerations
- Drive reliability, observability, and operational excellence for production services, addressing tech debt proactively
- Partner with the AI Engine team to integrate AI into experiment design, execution, and analysis
- Collaborate with Product Platform and other teams on SDKs, shared infrastructure, and architectural decisions
- Mentor engineers through code reviews, pairing, and 1:1 support
- Serve as an escalation point for complex bugs and on-call incidents
- Work with Support and Solutions Engineering on customer escalations and technical questions
- Partner with Product and Design to identify and lead future work beyond the current roadmap
Requirements:
- Bachelor's degree in Computer Science, Mathematics, a related field, or equivalent practical experience
- 5+ years of professional software engineering experience with a proven track record of delivering quality solutions with speed
- Experience building and operating production systems end to end, with real ownership of reliability and correctness
- Expert-level depth in at least one area (systems, web, or data infrastructure) with broad understanding of full-stack architecture
- Experience owning technical design for complex projects and managing multiple concurrent workstreams
- Strong cross-functional collaboration skills; work effectively with other teams and stakeholders with little guidance
- Sound judgment in setting priorities, selecting technologies, and making tradeoffs that factor in technical, product, and business considerations
- Track record of mentoring other engineers and contributing to team growth
- Strong technical communication, ideally with experience in asynchronous remote environments
- Desire to help teams build and decide faster in the AI era
Bonus qualifications:
- React / TypeScript experience
- Django / Python experience
- Experience with experimentation, feature flagging, or session replay products
- Experience building high-throughput, low-latency services
- Familiarity with analytics or observability platforms
- Experience building with LLMs, AI agents, or tool-use frameworks
- Comfort using AI coding tools (Claude Code, Cursor, etc.)
