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

Last updated: July 2026

Klaviyo hit $1.2 billion in revenue in 2025, grew 32% year-over-year, and powers 193,000+ brands from its Boston headquarters.

And it went public on NYSE in September 2023, backed by a $100M strategic investment from Shopify. For the 2027–2028 internship cycle, applications are expected to open September to October 2027, roughly 8 months before the June start.

But here's the catch: Klaviyo hires on a rolling basis with a recommended apply-by date of February 15, and the cohort is intentionally small (30 to 40 interns). That tight capacity means spots fill fast once listings go live.

Quick Facts

The numbers that matter: a rolling window expected to open September 2027, an 11-week program paying $53/hour, a 90%+ reported return offer rate, and a cohort size of just 30 to 40 interns across all tracks.

Externships are short, remote professional experience programs where you finish a real project with a real company. The Wayfair AI Agent Engineering for Business Intelligence Externship and the TikTok Social Media Content & Brand Strategy Externship build exactly the engineering and marketing evidence that a rolling application to Klaviyo needs. Explore all Externships.

What Is a Klaviyo Internship?

A Klaviyo internship is a paid, 11-week Summer Analyst placement that gives interns ownership of business-critical projects shipping to 193,000+ customers, with a deliberately small cohort (30 to 40 people) designed for meaningful responsibility from day one. The program runs out of Klaviyo's headquarters at 125 Summer Street in Boston, and it draws from an AI-first engineering culture inside one of the fastest-growing marketing technology platforms in the country. With $1.2 billion in 2025 revenue, 32% year-over-year growth, and a strategic partnership with Shopify (which owns roughly 11% of the company), Klaviyo offers the scale of a public company alongside the ownership and pace of a high-growth startup that hasn't lost its scrappy DNA.

When Do Klaviyo Internship Applications Open for 2027–2028?

Klaviyo runs on a rolling calendar with a clear recommended cutoff. Based on prior cycles, summer 2026 applications opened in fall 2025, with a recommended apply-by date of February 15.

So what does the 2028 timeline look like? Listings are expected between September and October 2027, with rolling interviews from October 2027 through March 2028 and offers flowing after that. The gap from application open to internship start is roughly 8 months, so the proof you bring to your resume needs to be built before September 2027.

Why You Must Apply the Week Applications Open

Klaviyo hires on a rolling basis, and the math confirms why speed matters. The cohort is intentionally small: 30 to 40 interns across all tracks, compared to hundreds at larger tech companies.

And the job posting itself says it: "It is highly recommended that you apply prior to February 15th as we interview and hire on a rolling basis." So what happens if you wait until February? By then, the strongest candidates have already interviewed, and seats are filling. The average hiring timeline is just 23 days from application to decision, which means Klaviyo moves fast once your file enters the funnel. Waiting for a deadline that technically still exists is a losing strategy when the seats number fewer than 40.

Which Klaviyo Internship Programs Should You Target?

Klaviyo posts 6 to 9 internship tracks each summer, spanning software engineering, AI, data science, marketing, and sales. Which one you target should match the skills you can already show, because each track interviews against its own job description and requires different prerequisites.

See all open tracks on the Klaviyo Campus Greenhouse board. Note that SWE and AI Engineering positions are concentrated in Boston, while some roles may also be available in San Francisco.

What Are the Eligibility Requirements?

Klaviyo publishes consistent requirements across its intern postings, though they vary slightly by track:

• Year: penultimate-year undergraduate or graduate student (graduating December of the internship year or May/June of the following year). Any major for some tracks; CS/Engineering/Data Science preferred for SWE.

• GPA: preferred range of 3.5 to 3.99 (per Vault), though Klaviyo states they "believe everyone deserves a fair shot" and encourages near-match applicants to apply.

• Prior experience: at least one prior software engineering internship or co-op required for SWE roles. Product Marketing requires at least one previous internship at a SaaS or tech company.

• Work authorization: US positions are not eligible for immigration sponsorship. Klaviyo won't sponsor work visas for interns.

• Availability: full 11-week commitment (June to mid-August), 5 days per week on-site at Boston HQ.

Does Klaviyo Have a Hard GPA or Experience Cutoff?

Not exactly. The GPA preference of 3.5+ is stated as a preferred range rather than a hard gate, and Klaviyo explicitly encourages applicants who are a "near match" to still apply.

But the prior internship requirement is real: SWE tracks require at least one completed internship or co-op, which functions as the true hard filter. If you don't have prior engineering experience yet, that's the gap to close before September 2027. The no-visa-sponsorship policy is the other hard gate: if you need employment sponsorship of any kind, this internship is effectively unavailable for US positions.

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

Six real Klaviyo intern job descriptions tell a consistent story. Python appears in five of six. SQL and data analysis show up in four. Agile shipping culture scores four of six.

But here's what's interesting: distributed systems (Kafka, Redis, Cassandra) appear in three JDs, and so does machine learning and AI. What does that pattern reveal? Klaviyo hires engineers who can build at scale and aren't afraid of real-time data pipelines processing billions of events weekly.

How Is Demand for SWE Interns Moving Right Now?

Build These Skills Before You Apply

Every top skill in the chart maps to a remote Externship where you finish a real company project before the window opens.

How tight is the overlap? The Wayfair deliverable is a production AI agent system in the AI Engineering posting's exact vocabulary, and the TikTok project produces brand strategy and content assets that map directly to Klaviyo's Product Marketing skill set. Both end on a client-ready presentation, which is the kind of artifact a rolling application can point at.

What Is the Klaviyo Application and Interview Process Like?

Klaviyo runs a three-to-four stage funnel, and the rolling timeline means each stage can start within days of the previous one:

1. Apply through job-boards.greenhouse.io/klaviyocampus or the main careers page with your resume and application details. Klaviyo posts separate listings per track, so choose your strongest-fit role rather than scattering applications. Apply before February 15 for best consideration.

2. Recruiter screen arrives first: an initial call to discuss your background, interest in Klaviyo, and logistics. This is also where they confirm you meet the prior-internship requirement.

3. CodeSignal online assessment follows for engineering roles. It's approximately 90 minutes with 4 questions.

But here's what's different: it's NOT traditional LeetCode. Expect realistic scenario-based problems like finding and fixing bugs in existing code, iterative implementation that builds across 3 parts, and API design. Focus prep on real-world debugging rather than competitive programming. 4. Superday (3 hours) at Boston HQ or virtually. Includes a behavioral interview, an API design and collaboration round (you'll pair with an engineer on a realistic scenario), and a system design round. The focus is collaborative problem-solving, not adversarial questioning.

Important: Klaviyo is an AI-first company and encourages candidates to use AI tools in their day-to-day work.

But that doesn't mean the interview is AI-assisted: the CodeSignal assessment and live rounds test your own problem-solving. Glassdoor data shows the average time from application to hire is about 23 days, so the process moves quickly once your file is picked up.

What Students on Reddit Say

Three community threads show what the program looks like from the inside.

How Do You Stand Out When Rolling Review Starts in September?

Three moves, all executable before the window opens. First, close the prior-experience gap now; Klaviyo requires at least one completed internship or co-op for SWE tracks, so if you don't have one yet, a remote Externship fills that requirement with a real company project on your resume. Second, build evidence in the JD's exact language: Python, distributed systems, and real-time data pipelines are the top skill clusters, and a finished AI or engineering project answers behavioral questions with artifacts rather than anecdotes.

And third, prepare for CodeSignal before you submit, because the assessment arrives within days. It's scenario-based (bug-finding, iterative implementation), not LeetCode, so practice debugging and API design problems rather than competitive programming. There's no breathing room in a 23-day funnel with 30 to 40 seats.

What Other Companies Should You Consider?

Klaviyo competes in the high-growth SaaS and marketing technology tier. If you're targeting software engineering internships at fast-growing tech companies, these are the closest comparisons in culture, compensation, and timeline.

Our tech internships summer 2027 guide maps the full landscape of SaaS and tech company timelines in one place.

FAQ

How much do Klaviyo interns get paid?

Software engineering interns earn $53 per hour, which works out to roughly $9,187 per month or $110,000 annualized. You'll also get up to $300 per month for transit or parking, comprehensive health coverage, and office perks like team outings, game rooms, and Red Sox tickets.

When should I apply for the Summer 2028 Klaviyo internship?

Apply as early as possible once listings go live, expected September to October 2027. Klaviyo recommends submitting before February 15 because they interview and hire on a rolling basis. Earlier is better when the cohort is only 30 to 40 people across all tracks.

Does Klaviyo require prior internship experience?

Yes, for engineering tracks. SWE roles require at least one completed software engineering internship or co-op. Product Marketing requires at least one previous internship at a SaaS or tech company.

So if you don't have prior experience yet, that's the gap to close first.

What is the Klaviyo CodeSignal assessment like?

It's a 90-minute online assessment with 4 questions, but it's not traditional LeetCode. Expect scenario-based problems: finding and fixing bugs in existing code, iterative implementation that builds across 3 parts, and API design challenges. Focus prep on real-world debugging rather than competitive programming.

Does Klaviyo sponsor visas for summer interns?

No. US internship positions aren't eligible for immigration sponsorship. The standard posting explicitly states no sponsorship is available. International students on OPT or CPT should verify their eligibility directly with the recruiting team before applying.

Is Klaviyo's internship remote or in-person?

Fully in-person, 5 days per week at Klaviyo's Boston headquarters on 125 Summer Street. There's no remote option for interns. The office features multiple floors, recreation areas, an outdoor terrace, and regular team social events throughout the summer.

What is the return offer rate at Klaviyo?

Community reports indicate a 90%+ return offer rate. Klaviyo keeps the cohort intentionally small (30 to 40 interns) to ensure meaningful project ownership and strong conversion outcomes. New grad total compensation after conversion is approximately $165K in Boston.

What makes Klaviyo different from other tech internships?

Three things stand out. First, the small cohort means you own real features shipping to 193,000+ customers rather than working on side projects. Second, it's an AI-first company that encourages using AI tools in your daily work.

And third, the $53/hour pay with a 90%+ return rate makes it one of the strongest risk-adjusted bets in Boston tech.

The window is rolling and the cohort is small. Spend the runway building proof: a remote Externship turns "interested in engineering" into a finished project that a rolling application can point at.