Quant Doesn't Want Your Network. It Wants Your Arithmetic.

In partnership with

Stop Paying for 10 Tools. One AI Does It All.

Most e-commerce sellers are running their store across 6 to 10 separate tools — and spending more time managing software than growing their business. StoreClaw replaces your entire stack with one autonomous AI engine that monitors competitors, optimizes listings, automates marketing, and tracks real profit across Shopify, Amazon, and beyond.

It doesn't wait for you to ask. It runs 24/7 in the background, so you wake up to a full dashboard instead of a list of things you forgot to check.

Connect your store, and StoreClaw gets to work — no prompts, no complex setup, no six-app stack.

Free to start. No credit card required.

Try it for FREE today

Welcome to today's SCALIS EarlyCareers newsletter! 🚀

Your roommate is grinding coffee chats for banking. So you copied the playbook for the trading firms on your list: LinkedIn notes to alumni, a tailored "why this firm" paragraph. Silence. That is not rejection. You are playing the wrong game in the wrong building.

Quantitative trading and research internships are the highest-paying seats in the entire Wave 1 cycle, and they are also the most misunderstood. Jane Street, Citadel Securities, Optiver, IMC, SIG, Hudson River Trading, D.E. Shaw and Two Sigma have had Summer 2027 postings live since July and August, most with no deadline printed anywhere. Nobody is pulling resumes for people they met at a networking night. The first gate is a test, and the first human you speak to will hand you a probability problem inside of ten minutes.

Here is the part the firms say out loud that students refuse to believe. Jane Street's own interview page states that a real person reads every application and responds within about a week, and that its trading interviews require no finance knowledge and none of the math from upper-level college courses. Optiver's campus FAQ says the same thing: no trading background needed, and the best preparation is mental math and strategy games. The bar is not who you know or what you know about markets. The bar is how you reason with numbers, out loud, under a clock.

Today: what actually gets screened, why an open posting is not an open seat, and the daily drill that turns a physics or CS major into a candidate these firms want to talk to.

Become An AI Expert In Just 5 Minutes

If you’re a decision maker at your company, you need to be on the bleeding edge of, well, everything. But before you go signing up for seminars, conferences, lunch ‘n learns, and all that jazz, just know there’s a far better (and simpler) way: Subscribing to The Deep View.

This daily newsletter condenses everything you need to know about the latest and greatest AI developments into a 5-minute read. Squeeze it into your morning coffee break and before you know it, you’ll be an expert too.

Subscribe right here. It’s totally free, wildly informative, and trusted by 600,000+ readers at Google, Meta, Microsoft, and beyond.

3,851 BRAND NEW internship positions freshly posted today. View the full list below and start applying!

Networking is not the application here

In banking, the coffee chat is the mechanism that gets your resume pulled. In quant, it is mostly noise. Jane Street reviews every submission by hand and answers every one. Candidates who arrive with a referral report sitting the exact same online assessment as everyone else.

That changes how you spend September. Stop treating trading firms like banks. Apply directly, apply across five to eight firms, and put the hours you would have spent on outreach into the skills the first round actually measures. The prep for Jane Street, Citadel Securities, Optiver, SIG and IMC overlaps almost completely, so every hour transfers.

One relationship does matter: the recruiter, once you are in process. Citadel Securities asks candidates to disclose competing offers and interview timelines as soon as they exist, and says it will try to accelerate. That is a real lever, and you should pull it.

Finance knowledge is not the bar. Six-second arithmetic is.

Students prep for quant the way they prep for banking: options theory, market vocabulary, a "view" on rates. Then the screen turns out to be fractions.

The most famous version is Optiver's first-round test, widely reported by candidates as roughly 80 mental-arithmetic problems in about eight minutes, with points deducted for wrong answers. That is six seconds per question, no calculator. The firm does not publish the format, but its own FAQ tells you to practice mental math, which is the tell. Most rejections happen right here, before anyone has read your resume.

The fix is boring and effective. Ten minutes a day on a timed arithmetic drill (Zetamac and tradermath.org are free) for three to four weeks, focused on two-digit multiplication, fractions, and percentages. Then a first course in probability: expected value, conditional probability, Bayes, combinatorics. That is the entire syllabus for the first human conversation.

Pick your track before you apply. There are four.

"Quant internship" is not one job. Trader, researcher, quant developer and software engineer are separate requisitions with separate interviews and a separate bar. Trading rounds lean on mental math, probability and market-making games. Citadel Securities describes its campus research process as a 45 to 60 minute remote round on CoderPad in Python or C++, focused on data structures, algorithms and research ability, followed by three to five onsite interviews and a team-matching step. Engineering seats at these firms are typically the largest intern classes and lean on rigorous coding rather than probability.

Citadel Securities also says it prefers to interview you for one role at a time, and will share your resume with other teams if there is a fit. Translation: pick the track where your evidence is strongest and let the firm reroute you. A CS major with a competitive programming record should not be forcing a trader application because trading pays the most.

Learn AI in 5 minutes a day

You don't have to scroll every AI thread, track every new tool, or watch every demo. 

The Rundown AI breaks it all down for you — the latest AI news, tools, and tutorials in one free 5-minute email every morning. 

Trusted by 2M+ professionals at Apple, Google, and NASA.

Sign up to start learning.

The posting says open. The seats say otherwise.

Almost none of these postings carry a close date. It is a rolling funnel that fills as candidates clear the bar, and candidate trackers have consistently reported the bulk of trading and quant offers signing by October or November while the same postings stay visible into December.

Citadel Securities puts its research process at roughly four to five weeks start to finish. Count backward from late October and you land on right now. The rule for this lane: submit the day your arithmetic drill is passing, not the day you feel ready. Some firms, IMC among them by its own posted policy, allow one application per role per cycle, so do not fire a blank one to "get in early." Be early and prepared, in that order.

Think out loud or lose the room

Every one of these firms publishes the same instruction in different words. Jane Street lists four: approach the problem methodically, communicate clearly, correct your mistakes, ask why. Citadel Securities: share your thought process, discuss trade-offs, be clear about what you know and do not know, and if you get stuck, say so and take the hint.

A wrong turn you can explain scores higher than a right answer reached in silence, because the interviewer is grading the reasoning, not the number. Jane Street posts a full 23-minute mock trading interview with timestamps on its site. Watch it once for content and once with the sound off, just tracking how often the candidate talks. That is your target.

First-years and sophomores: the side door is open

If you are not a junior, the summer seat is mostly out of reach, and the firms know it. So they built feeders. Citadel Securities lists Discover Citadel Securities, campus datathons, a Quant Invitational, a Trading Invitational, the Terminal coding competition and the Ignite Women's Trading Program on its programs page, several of them aimed at students two or three years from graduation. Jane Street runs trading camps and insight programs. Optiver runs FutureFocus for students graduating in 2028. They are the pool the firms fish from when the real internship postings open.

Bonus: the 20-minute daily quant drill

Run this every day until your first screen, starting today.