Staff Software Engineer, Agent Platform

The job

LIVE Employer public job feed (private-sector employer) Source: the employer's public careers feed · Data: listed 2026-04-14

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.

Explore around this job

Field: Technology Sub-niche: Software engineering All jobs at Replit Jobs in California Jobs in Foster City, CA Foster City city guide California state guide San Mateo County economy

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About the role

This is a — role in the Technology field (Software engineering) at Replit.

We could not match this job title to one occupation in the official wage statistics, so no pay estimate is shown. Pay is not in the source listing; ask the employer for the range and compare in the 240 job niches.

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How to prepare and behave

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• Have code, data work or projects you can show, and be ready to think aloud: many technical interviews test how you reason, not only the answer.

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The city

The job is in Foster City, CA. Below is what the official statistics say about living and working there.

How Foster City compares. Among the 145 largest places in California, Foster City is #131 by population, #140 for rent (#1 = cheapest), #10 for college degrees (#1 = most), #10 for remote work (#1 = most). Its county, San Mateo County, is #2 of 58 counties for average pay ($196,441).

The place in numbers

Foster City has 32,792 residents (ACS 2020–2024), about 0.1% of the population of California. It covers 4 square miles of land, which works out to roughly 8,659 people per square mile. The median age is 39.5, 4% older than the state median (39.5 against 37.9).

Housing

The median gross rent is $3,501 a month (rent plus utilities), 72% above the state median ($3,501 against $2,036). Over a year that is 21.1% of the median household income. US housing guidance treats housing as affordable when it takes 30% of income or less, so the typical household is under that line. The median home value is $1,838,200, which is 9.2 times the median household income ($199,143); a ratio above 5 usually means buying is out of reach without savings or a second income. 50.8% of households own their home, 9% below the state average (50.8% against 55.9%).

Work and pay

The San Francisco-Oakland-Fremont, CA metropolitan area has 2,373,920 jobs in the BLS wage survey, and the median pay across all occupations is $74,260 a year, 46% above the national median ($74,260 against $50,980). The biggest occupation groups are office and administrative support (226,320 jobs, median $62,120); management (223,100 jobs, median $176,340); business and financial operations (207,030 jobs, median $112,960). The area is most specialised in computer and mathematical (1.9 times) and life, physical, and social science (1.8 times), where the share of workers is well above the national share. The best-paying groups with at least 5,000 jobs are management ($176,340) and computer and mathematical ($167,770). In 2026M09 the unemployment rate of San Mateo County was 3.9%. 67.2% of residents aged 16 and over are in the labour force. The city lies in San Mateo County; its jobs, pay by industry and GDP are on the county page.

Getting around

Among workers, 51.8% drive alone, 2.9% use public transit, 1.7% walk, 34.2% work from home. 20.6% of workers commute 45 minutes or more, 6% above the state average (20.6% against 19.4%). Remote work is more common than in the state as a whole, which widens the set of employers a resident can work for without moving.

People and education

73.8% of adults aged 25 and over hold a bachelor's degree or higher, 99% above the state share (73.8% against 37.1%). 49.5% of residents were born outside the United States, 83% above the state share (49.5% against 27.0%). The poverty rate is 4.1%, 66% below the state rate (4.1% against 12.0%).

Climate

The warmest month is Sep, averaging 61°F (16.0°C), and the coolest is Jan at 51°F (10.7°C). About 515 mm (20 inches) of precipitation falls in a year; Dec is the wettest month (115 mm) and Jul the driest (2 mm). These values come from NASA satellite-based climatology on a grid of about 50 km, so they describe the wider area, not a weather station in the city.

Nearby cities to compare

Closest cities in this guide: San Mateo (3 miles, rent 12% lower); Redwood City (4 miles, rent 15% lower); Belmont (4 miles, rent 18% lower); San Carlos (5 miles, rent 18% lower). Rent differences are against Foster City; use the Compare tab to put any two cities side by side.

Full guide to Foster City →California guideAll jobs in Foster City

Official links for Foster City

• Official website of Foster City: fostercity.org
• Census Bureau data profile for Foster City
• Official website of San Mateo County: smcgov.org
• Official state website: ca.gov
• BLS Economy at a Glance: California

These links go to official sources and open in a new window. The first one is the government's or company's own site as listed in Wikidata (property "official website"); check it before relying on it.

Where to live

The job city has no coordinates we can place on the map, so no housing comparison is shown. Use the 250 largest cities table to compare rent and income.

Career paths

We could not match this title to one occupation, so here are the other sub-niches in Technology, where your skills may carry over:

Cybersecurity (713) Data, analytics and AI (3366) Cloud, IT and infrastructure (1040) Product management (836)

Distances

This job has no single city we can place on the map (remote, flexible or unmatched location), so no distance table is shown. Browse all Technology jobs with distances from any of the 20 largest cities.

The employer

Replit is the employer in this listing. See all its open jobs here →

We do not hold headcount or revenue for this employer. Check its careers site and, if it is listed on a stock exchange, its public filings (SEC EDGAR search).

What it is like to work at a company (culture, schedules, benefits) is not in the source data, so we do not describe it. Read the description and ask the questions under "How to prepare".

Other open jobs at Replit

Similar jobs

Same sub-niche: Software engineering

More jobs in Foster City, CA

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FAQ

What is the Staff Software Engineer, Agent Platform job at Replit?

A private-sector role in technology (software engineering) listed 209 days ago. The full description is on this page and on the employer's page.

Where is this job?

Foster City, CA. A remote or flexible location is listed; confirm with the employer which states are accepted.

How do I apply?

Use the "View this job and apply on the employer's page" button. AtiveSite does not receive applications.

How much does it pay?

The listing does not publish pay, and we could not match the title to one official occupation.

What is the cost of living there?

Median rent in Foster City is $3,501 a month and median household income $199,143 (ACS 2020–2024).

How old is this listing?

It was posted on 2026-04-14 (209 days ago). Jobs older than 90 days are not shown.

Are there similar jobs?

Yes: browse software engineering jobs in California.

Sources and terms

• Job data: Replit careers page public feed (listing dated 2026-04-14). The job disappears from this site when it disappears from the source.
• Wages and projections: BLS OEWS (May 2025) and Employment Projections 2025–35.
• City and county figures: Census Bureau ACS 2020–2024, BEA, BLS QCEW and LAUS, NASA POWER climatology; distances from Census Gazetteer coordinates.

AtiveSite is not affiliated with or endorsed by the employer or any government agency, and does not process applications. Verify every detail with the employer before acting.

Sources

• BLS OEWS (wages and employment by occupation, May 2025)
• BLS Employment Projections 2025–35
• BLS Local Area Unemployment Statistics
• BLS JOLTS
• BLS State and Metro Area Employment
• Census Bureau American Community Survey (via Census Reporter)
• BEA GDP by state and Regional Price Parities
• IRS 2026 tax adjustments
• U.S. Department of Labor, minimum wage by state
• Tax Foundation state income tax rates 2026
• USAJOBS
• USCIS
• U.S. Department of State, visas
• NASA POWER climatology
• GeoNames / Census Gazetteer (coordinates)