Software Engineer, RLE

About Handshake

Handshake is the career network for the AI economy. 20 million knowledge workers, 1,600 educational institutions, 1 million employers (including 100% of the Fortune 50), and every foundational AI lab trust Handshake to power career discovery, hiring, and upskilling, from freelance AI training gigs to first internships to full-time careers and beyond. This unique value is leading to unparalleled growth; in 2025, we tripled our ARR at scale.

Why join Handshake now:

• Shape how every career evolves in the AI economy, at global scale, with impact your friends, family and peers can see and feel

• Work hand-in-hand with world-class AI labs, Fortune 500 partners and the world’s top educational institutions

• Join a team with leadership from Scale AI, Meta, xAI, Notion, Coinbase, and Palantir, among others

• Build a massive, fast-growing business with billions in revenue

We’re hiring a Staff Software Engineer to lead the architecture and evolution of our Reinforcement Learning Environments (RLE) platform—the systems that define how frontier AI models learn real-world work.

This is a high-impact, technical leadership role responsible for system design, cross-team alignment, and setting the long-term technical direction of RLE.

Location: San Francisco, CA (in-office, 5 days/week)

• Define and drive architecture for scalable, extensible RLE systems and data pipelines

• Lead development of platform capabilities enabling rapid domain creation

• Partner with Research, Product, and Ops to shape strategy and execution

• Set standards for reliability, observability, performance, and data quality

• Mentor engineers and elevate engineering excellence across the team

• Identify and solve systemic bottlenecks in scaling environments and data generation

• 8+ years of experience in distributed systems, backend infrastructure, or ML platforms

• Deep expertise in system design, data modeling, and scalable architectures

• Strong proficiency with Type Script, backend systems, and modern web stacks

• Proven experience operating high-scale production systems in cloud environments

• Track record of technical leadership and cross-functional influence

• Experience with RL infrastructure, simulation systems, or evaluation frameworks

• Background supporting applied AI/ML research teams

• Experience building platform-level abstractions used across multiple teams

• RLE becomes a foundational, trusted platform across teams and use cases

• New domains scale rapidly with minimal engineering overhead

• Systems demonstrate step-function improvements in model quality and reliability

• Engineering velocity and system robustness increase across the organization

Handshake delivers benefits that help you feel supported—and thrive at work and in life.

The below benefits are for full-time US employees.

• Ownership:
  Equity in a fast-growing company
• Financial Wellness: 401(k) match, competitive compensation, financial coaching
• Family Support:
  Paid parental leave, fertility benefits, parental coaching
• Wellbeing:
  Medical, dental, and vision, mental health support, $500 wellness stipend
• Growth: $2,000 learning stipend, ongoing development
• Office:
  Commuting support, free lunch, and gym in our SF office
• Time Off:
  Flexible PTO, 15 holidays + 2 flex days
• Connection:
  Team outings & referral bonuses