Staff Software Engineer, Agent Platform
Replit
Listing collected from Replit's career site. NextChapter is independent of Replit.
Foster City, CA · $250k–$365k a year · Posted April 14, 2026
Just laid off? Start here: a plan for the first weeks
More in California job market · All Staff Software Engineer jobs (832) · Technology & Software · Engineering jobs
More roles at Replit
- Chief of Staff, Office of the President · Foster City, CA
- AI Agent Security Architect · Foster City, CA
- Head of Marketing Strategy & Operations · Foster City, CA
- Software Engineer, Enterprise · Foster City, CA
- Security Engineer - Vuln Management (Infra) · Foster City, CA
- Engineering Manager, UX · Foster City, CA
Similar jobs
- Flight Software Engineer - Level 3 or 4 (Active Secret) - AHT · Northrop Grumman · Redondo Beach, CA
- Software Engineer, Bachelors Degree, New College Grad (Santa Clara) · Applied Materials · Santa Clara, CA
- Principal Firmware Engineer · Lunar Energy · Mountain View, CA
- Software Engineer/Principal Software Engineer - Java · Northrop Grumman · San Diego, CA
- Staff Firmware Engineer · Lunar Energy · Mountain View, CA
- Global Software Support Engineer III - (E3) · Applied Materials · Santa Clara, CA
Where Foster City, CA ranks
Where Foster City, CA placed in our monthly rankings, month by month. Each month stays online at its own address.
November 2026
- #1Best cities for pay after cost of living$209k · of 100
- #1Best cities for pay after cost of living in the West Coast$209k · of 39
- #1Best cities for pay after cost of living in California$209k · of 32
- #1Best cities for director and executive jobs in the West Coast38% · of 71
- #1Best cities for data and analytics pay after cost of living$232k · of 28
- #1Best cities for technology pay after cost of living$209k · of 80
Rankings about engineering jobs
- Best cities for software and engineering jobs #1 San Francisco (3,412 openings)
- Best cities for engineering pay after cost of living #1 San Mateo ($216k)
- Most requested AI skills in engineering jobs #1 AI tools in daily work (6.1%)
- AI tools named most often in engineering jobs #1 Claude (1.7%)
- Employers with the most engineering jobs #1 Amazon (2,992 roles)
Pay compared with the market
This listing pays about $307,500 a year. Across 426 open staff software engineer listings that state pay, the middle half runs $225,000 to $271,000 and the median is $242,500. That is 27% above the median, above the middle half of those listings.
Listed pay is what employers advertise, not what people are paid.
Staff Software Engineer salaries by state · Check your own pay
How AI is used in this kind of work
Among software developers, AI is already used for some of the tasks. Measured exposure for software developers: 29% (some).
Share of this job’s tasks that AI is already used for at work, from real usage. It is not a forecast of job loss, and a low number means no use seen yet. Source: Anthropic Economic Index.
Skills this job asks for
Say which you have and which you want to build. We use it to match you to jobs like this one.
About the job
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 https://replit.com/blog/self-driving-company
- Replit Agent at Scale https://replit.com/blog/evaluating-and-improving-agent-at-scale
- AI Adoption https://replit.com/blog/ai-adoption
- Build Open-Source Apps https://replit.com/build/open-source-app-builder
Interviewing + Culture at Replit
- Operating Principles https://blog.replit.com/operating-principles
- Reasons not to work at Replit https://blog.replit.com/reasons-not-to-join-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.