Staff Software Engineer, Agent Platform

Fdetimes; Foster City (CA); Hybrid; USD 180,000 - 260,000; Full time

Benefits offered by this job

Health insurance

401(k) match

Paid time off

Flexible Time Off

Job summary

Replit is hiring for a senior backend/infra engineer to build high-throughput services that power the Agent experience and scale the platform. You will bridge gaps between AI and UX teams, shaping end-to-end tooling and infrastructure for rapid product iteration.

The role blends systems engineering with developer experience, requiring autonomy, collaboration, and a passion for durable, scalable software across frontend/backend and Linux systems. Foster City hybrid work engages in-office M/W/F.

Qualifications

• 8+ years professional experience building backend services, systems and platforms.
• Self-directed and autonomous with strong ownership.
• Collaborative, team-oriented with a strong sense of shared ownership.

Responsibilities

• Build high-throughput backend applications and services, like streaming chat between user and agent.
• Design a collaborative "Multiplayer Computer" that lets humans and AI agents work together on shared shells, filesystems, and state—conflict-free and in real time.
• Develop infrastructure (frontend & backend) that empowers product engineers to rapidly ship delightful user experiences.
• Design and build durable, well-crafted interfaces between the Agent and internal systems, as well as external agentic systems (MCP)

Skills

Backend services

Self-directed

Collaborative

Ownership

Tools

OT/CRDTs

Git

Event Sourcing

Job description

Replit is the agentic software creation platform that enables anyone to build applications using natural language. With millions of users worldwide, Replit is democratizing software development by removing traditional barriers to application creation.

About Replit

Replit is building the world’s most ubiquitous AI coding agent. Replit Agent can be used by anybody to bring their ideas to life. Whether it’s an app for yourself, the next great startup idea, or a tool to make you more productive at work, Replit Agent can help build it. Replit is also the leader in secure vibe coding. We protect apps, give users features to manage security risks, and help them vibe code more safely.

About the Role

In this role you will build powerful tools that help product engineers iterate rapidly on the Agent experience and directly enhance the core Agent itself. You’ll bridge the gap between the AI team (working on the core Agent logic) and the UX team (crafting delightful Agent experiences), enabling both groups to excel within their specialties.

This role blends systems engineering, developer experience and product engineering. We tackle complex challenges across the full stack, from browser-based interfaces to high-performance backends to Linux systems engineering. We’re looking for engineers who have a keen sense of the product experience and how to power it with performant systems.

On this team, you’ll have the opportunity to grow your skills across our infrastructure and product, and to lead end-to-end efforts with meaningful impact. We value diverse perspectives and encourage candidates from all backgrounds and experiences to apply.

You Will

• Build high-throughput backend applications and services, like streaming chat between user and agent.
• Design a collaborative "Multiplayer Computer" that lets humans and AI agents work together on shared shells, filesystems, and state—conflict-free and in real time.
• Develop infrastructure (frontend & backend) that empowers product engineers to rapidly ship delightful user experiences.
• Design and build durable, well-crafted interfaces between the Agent and internal systems, as well as external agentic systems (MCP)

Required Skills and Experience

• 8+ years professional experience in building backend services, systems and platforms
• Someone who values simplicity and pragmatism—you think radically but ship incrementally.
• Self-directed and comfortable working autonomously.
• Collaborative and team-oriented with a strong sense of shared ownership.

Preferred Qualifications

• Experience across the full-stack.
• Experience building AI powered tooling or products.
• Experience with collaborative editing technologies such as Operational Transforms (OT), CRDTs, or the inner workings of Git.
• Experience with event sourcing systems.

What We Value

• Problem-solving mindset: Ability to approach complex operational challenges systematically and devise effective solutions
• Self-directed and autonomous: Capable of working independently while collaborating effectively with cross-functional teams
• Strong communication skills: Ability to explain complex technical concepts to both technical and non-technical audiences
• Continuous learning: Passion for staying current with industry best practices and new technologies
• Focus on automation: Strong belief in automating repetitive tasks and building self-healing systems

This is a full-time role that can be held from our Foster City, CA office. The hybrid role has an in-office requirement of Monday, Wednesday, and Friday.

Full-Time Employee Benefits Include

Competitive Salary & Equity

401(k) Program with a 4% match (US Only)

Health, Dental, Vision and Life Insurance

Short Term and Long Term Disability

Paid Parental, Medical, Caregiver Leave

Flexible Time Off (FTO) + Holidays

Commuter Benefits (In-Office & US Only)

Monthly Wellness Stipend

Autonomous Work Environment

In Office Set-Up Reimbursement (In-Office Only)

Quarterly Team Gatherings

In Office Amenities (In-Office Only)

Want to learn more about what we are up to?

• Self-driving Company
• Replit Agent at Scale
• AI Adoption
• Build Open-Source Apps

Interviewing + Culture at Replit

• Operating Principles
• Reasons not to work at Replit

To achieve our mission of making programming more accessible around the world, we need our team to be representative of the world. We welcome your unique perspective and experiences in shaping this product. We encourage people from all kinds of backgrounds to apply, including and especially candidates from underrepresented and non-traditional backgrounds.