Sierra Internship 2027–2028: Programs, Deadlines & How to Apply

Quick Facts

Last updated: November 2026

Sierra reached a $15.8 billion valuation within three years of founding, making it one of the fastest-growing AI companies in history. Co-founded by Bret Taylor, the current OpenAI Board Chair and former Co-CEO of Salesforce, and Clay Bavor, who spent 18 years at Google leading Labs, AR/VR, and Workspace, Sierra builds autonomous AI agents for the world's largest enterprises. With roughly 51 to 200 employees and a hypergrowth trajectory funded by $1.6 billion from Sequoia, Benchmark, and Google GV, the estimated acceptance rate for early-career roles sits below 5%. Applications are reviewed on a rolling basis and interviews typically wrap by December, so applying early is the strongest move on the board.

What Is a Sierra Internship?

A Sierra internship places you inside a $15.8 billion AI startup building autonomous conversational agents for enterprises including WeightWatchers, SiriusXM, and ADT. Unlike rotational programs at large tech companies, Sierra's early-career tracks put interns and new graduates on production agent development work from day one. The APX Program, modeled after the Google APM program that both co-founders completed, focuses on product strategy and customer engagement. The Agent Engineering track centers on building the core AI agent platform. And the seasonal intern cohort in Agent Development offers hands-on work nearing graduation. Sierra's in-person culture is non-negotiable, the founding team emphasizes values alignment alongside technical ability, and the company's hypergrowth creates strong demand for converted interns. Glassdoor gives Sierra a 4.4 out of 5 overall rating with 5.0 for career opportunities and 4.8 for compensation.

When Do Sierra Internship Applications Open for 2027–2028?

Sierra's early-career hiring follows a seasonal pattern tied to university calendars. For the Fall 2026 intern cohort, postings appeared on Ashby and were filled through rolling review with interviews wrapping by December. The Summer 2027 cycle has started on a similar rhythm: Sierra's Software Engineer Intern, Agent (Summer 2027) posting is dated August 31, 2026 and was listed on its job board on October 11, 2026, with no closing date printed. Based on the prior cycle, expect rolling applications through the fall, onsite interviews from October through December, and offers extended from November 2026 through January 2027. The critical insight: an earlier version of Sierra's FAQ encouraged candidates to apply early, and with a small team of 51 to 200 employees filling a limited number of seats, late applications face significantly fewer open positions.

How to read this page: our dates come from tracking previous recruiting cycles and daily posting data. Treat them as informed estimates based on historical patterns, not confirmed dates. The company's official careers page is always the most current source. If a role is posted there, go by that, even if this page suggests the window hasn't opened yet.

Why You Must Apply the Week Applications Open

Rolling review is the mechanism Sierra described in an earlier version of its FAQ, which read: 'Applications are reviewed on a rolling basis, with interviews wrapping up by December. We encourage you to apply early to avoid missing out.' That wording was not on the FAQ on October 11, 2026, which now says timelines can vary. With a team of roughly 51 to 200 employees and an estimated acceptance rate below 5%, the math is simple: early applicants compete for more open seats with fresher reviewer attention. By December, the funnel closes. So with the Summer 2027 intern posting up since August 31, 2026 and still listed on October 11, 2026, secure a referral through conference networking or alumni connections and submit without further delay, and keep monitoring the Ashby job board and Sierra careers page for later postings. Sierra's founders came from Google and Salesforce, so referrals from those networks carry measurable weight.

Which Sierra Internship Programs Should You Target?

Sierra runs three early-career tracks, each with a distinct focus. The APX Program mirrors the Google APM model that both co-founders completed. Agent Engineering targets software engineers building the core AI platform. And the seasonal internship offers hands-on agent development. The right track depends on whether your evidence skews toward product thinking or technical implementation.

See every open role on Sierra's careers page and the Early Career Program. Note the AI agent focus: Sierra's entire product line centers on autonomous conversational agents for enterprise, so demonstrated experience with LLMs, RAG, and prompt engineering carries outsized weight.

What Are the Eligibility Requirements?

Sierra's early-career roles share a few common requirements, though specifics vary by track:

• Enrollment: the Software Engineer Intern, Agent (Summer 2027) posting listed on October 11, 2026 asks for students pursuing a bachelor's or master's degree in computer science or a related field and says the intern program is open to students graduating December 2027 to June 2028. Sierra's FAQ says you are eligible for the Internship program if you are graduating in 2028 and for New Grad opportunities if you are graduating in 2027. The APX (New Grad 2027) posting is open to students graduating from undergraduate or master's programs by June 2027. The Fall 2026 intern cohort targeted students graduating December 2026 through June 2027.

• Background: driven to turn AI theory into practice. Strong CS fundamentals with exposure to AI/ML concepts. No stated school requirements, but APX alumni come from Stanford, Harvard, and University of Michigan.

• Values alignment: Sierra evaluates candidates against five core values: Trust, Customer Obsession, Craftsmanship, Competitive Intensity, and Family. From their hiring page: 'We'll evaluate not only your capabilities, but also how well you align with our values.'

• Location: all programs require onsite presence. APX is San Francisco only. The Agent Engineering new grad posting and the Software Engineer Intern, Agent (Summer 2027) posting each list San Francisco with New York as a secondary location, as read on October 11, 2026. Sierra provides relocation assistance.

• Work authorization: Sierra sponsors visas but cannot guarantee sponsorship for every candidate. Relocation assistance is available for candidates outside the Bay Area.

Does Sierra Have a GPA or School Requirement?

Sierra has not published a GPA cutoff or school requirement. However, APX alumni profiles show backgrounds from Stanford, Harvard, and University of Michigan, suggesting a preference for strong CS programs. The more reliable signal is demonstrated AI experience: building agents, shipping ML-powered products, or contributing to open-source AI projects. Sierra's interview process weights values alignment and technical ability over transcript metrics, and their co-founders have emphasized hiring for potential and intensity.

What Skills Does Sierra Look For, and How Do You Build Them?

Read across Sierra's intern posting, APX program description, Agent Engineering listing, and interview question reports on Exponent and Glassdoor, and the pattern is clear. AI and ML fundamentals appear in every track, coding proficiency in Python is universal, and system design for AI agents is the differentiating skill that separates Sierra from generic SWE intern roles. But the technical bar is only half the evaluation. Sierra scores every candidate against five core values, and Glassdoor's 56% positive interview experience rate suggests the process is demanding. Bring the coding, then frame every story around how you turned AI theory into practice under intensity.

How Is Demand for AI Agent Engineering Interns Moving Right Now?

Build These Skills Before You Apply

And every skill in that chart maps to a remote Externship where you finish a real project you can point at in interviews.

How close is the overlap? The Wayfair project is agent-engineering work that produces the build-and-explain evidence Sierra's technical and values-based interviews probe for, and the TruBridge project delivers the data-analysis story a behavioral round wants.

What Is the Sierra Application and Interview Process Like?

Sierra's interview process runs through several stages, with values alignment evaluated alongside technical ability:

1. Find open roles on Sierra Careers and Ashby. Check the Early Career Program page for APX, Agent Engineering, and internship postings. The Software Engineer Intern, Agent (Summer 2027) posting was listed on Ashby on October 11, 2026, so apply without waiting. Secure a referral through conference networking or alumni connections before submitting.

2. Resume screen. Sierra's team reviews your skills, experience, and alignment with the role. AI/ML background, CS fundamentals, and values fit are the primary filters. APX alumni come from Stanford, Harvard, and Michigan, so calibrate accordingly.

3. Technical assessment (take-home or online). Problem-solving and coding ability. Reported question types include graph traversal, dependency detection in Excel-like spreadsheets, and grid search algorithms at LeetCode medium-to-hard difficulty. Sierra may also probe prompt engineering approaches.

4. Onsite interviews at a Sierra office (in-person). Multiple sessions including technical coding rounds, system design for AI agents (for example, 'Design an AI agent for a streaming service'), and behavioral questions aligned with Sierra's five values. Glassdoor rates the interview difficulty at 3.2 out of 5.

5. Offer. If successful, receive an offer with details on compensation, start date, and relocation support. Sierra provides relocation assistance for candidates outside the Bay Area.

So the two skills to drill are clear: LeetCode medium-to-hard fluency for the coding rounds (graph traversal, grid search, dependency detection), and four to six STAR stories tied to Sierra's five values: Trust, Customer Obsession, Craftsmanship, Competitive Intensity, and Family. Sierra's hiring page states: 'Excellence is about more than just functional expertise.' That sentence is the interview in miniature.

What Students on Reddit Say

Community discussion about Sierra is growing as the company scales. Here is what candidates and observers are saying, all paraphrased.

How Do You Stand Out at a $15.8B AI Startup With Under 200 Employees?

Three moves, with the Summer 2027 intern posting listed on Ashby on October 11, 2026. First, apply without waiting: rolling review plus an estimated sub-5% acceptance rate means timing is the sharpest edge, and a referral from the Google, Salesforce, or Stanford networks that Sierra draws from doubles your odds. Second, build agent-engineering evidence you can show, not just describe: Sierra's entire product is autonomous AI agents, so a project where you built an agent using RAG, prompt engineering, or LLM orchestration is the strongest signal. Third, prepare values-aligned stories with real deliverables, because Sierra evaluates every candidate against five core values and Glassdoor's 56% positive interview experience rate tells you the bar is high. 'Tell me about a time you demonstrated craftsmanship' needs a shipped artifact, not a hypothetical. And the hypergrowth math is in your favor: a company that grew from zero to $15.8 billion in three years needs converted interns, so interview like the full-time seat is already on the table.

What Other Companies Should You Consider?

Sierra competes for AI talent with the biggest names in the industry. If you are building an AI-internship list, these are the obvious neighbors:

Our tech internships summer 2027 guide maps the whole landscape, timeline by timeline.

FAQ

Does Sierra offer summer internships?

Sierra runs an Early Career Program with APX (product) and Agent Engineering (software) tracks, plus seasonal intern cohorts. The Fall 2026 Agent Development internship was confirmed, and a Software Engineer Intern, Agent (Summer 2027) posting dated August 31, 2026 was listed on Sierra's job board on October 11, 2026. Check sierra.ai/early-career-program for updates.

When do Sierra internship applications open for summer 2027?

The Software Engineer Intern, Agent (Summer 2027) posting went up on the Ashby ATS on August 31, 2026 and was still listed there and on the Sierra careers page on October 11, 2026, with no closing date printed. Applications are reviewed on a rolling basis, with interviews wrapping by December. Apply early; an earlier version of Sierra's FAQ encouraged it, though that wording was not on the FAQ on October 11, 2026.

How much does a Sierra internship pay?

Sierra has not published intern compensation. Based on comparable AI startup benchmarks, estimated pay is $55 to $75 per hour ($11,000 to $15,000 per month). Full-time SWE median total compensation is $325,000 per Levels.fyi.

Does Sierra sponsor visas for interns?

Yes, Sierra sponsors visas but cannot guarantee sponsorship for every candidate. From their FAQ: 'We'll do our best to support your visa process.' Relocation assistance is also available.

What is the Sierra interview process like?

You apply, complete a take-home or online technical assessment, then attend in-person onsite interviews at a Sierra office. Onsites include coding rounds (LeetCode medium-to-hard), system design for AI agents, and behavioral questions aligned with Sierra's five values. Glassdoor rates the difficulty at 3.2 out of 5.

How competitive is Sierra to get into?

Extremely competitive. Sierra has 51 to 200 employees at a $15.8 billion valuation. The estimated acceptance rate for early-career roles is below 5%. The company is discussed alongside FAANG in r/csMajors as a top-tier employer.

Is the Sierra internship remote or in-person?

All Sierra early-career roles require onsite presence. APX is San Francisco only. The Agent Engineering new grad posting and the Software Engineer Intern, Agent (Summer 2027) posting each list San Francisco with New York as a secondary location, as read on October 11, 2026. Sierra has a non-negotiable in-person culture.

Do Sierra interns get return offers?

No public data exists on Sierra's intern-to-full-time conversion rate. However, the APX program is explicitly structured as a pipeline to full-time roles, APX alumni now work full-time at Sierra, and the company's hypergrowth creates strong demand for converted interns. Comparable AI startups convert at 70 to 85%.

Sierra's estimated acceptance rate is below 5%, but every seat is won one rolling decision at a time. The Summer 2027 intern posting was listed on October 11, 2026, so apply and keep building proof: a remote Externship turns 'interested in AI agents' into a finished project you can point at in interviews.