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Chicago Trading Company SWE Intern OA 2027: CCAT, Codility, and Resume Screening
Chicago Trading Company SWE Intern OA 2027 guide: CCAT format, Codility questions, resume screening, preparation, scoring, and what happens next.
Updated August 15, 2026: Chicago Trading Company candidates are describing an unusual two-gate screening sequence for the Summer 2027 Software Engineering Internship: a fast cognitive and behavioral assessment first, followed by a separate Codility coding assessment for candidates who advance.
The surprising part is what happens around those tests. CTC's own campus recruiting page says that after a candidate passes an assessment, the company will review the resume and contact selected applicants with next steps. In other words, an OA invitation is a chance to compete, not proof that your resume has already cleared the full screen.
Then prepare the CCAT and Codility as different events: one rewards rapid triage, while the other rewards correct, scalable code and disciplined testing.
The current CTC SWE Intern process is best understood as two assessment gates, with resume review and interviews still separate decisions.
Chicago Trading Company SWE Intern OA 2027: Quick Answer
The short answer: CTC officially says campus candidates may receive either an aptitude assessment or a coding challenge, depending on the role. Current Summer 2027 SWE candidates more specifically report completing an aptitude and behavioral assessment, then receiving a Codility test with three coding questions and roughly a three-hour window.
The CCAT format itself is official: Criteria says it contains 50 verbal, math and logic, and spatial-reasoning questions in 15 minutes, with no calculator. The three-question Codility format is supported by several recent candidate reports, but CTC has not published it as a universal 2027 specification. Your invitation remains the source of truth.
CTC's public process also resolves the resume-screening question more clearly than most Reddit threads. Its campus page says, "If you pass, we will review your resume and reach out with next steps." A high coding score can help, but it does not automatically create an interview.
What Is Confirmed, Reported, and Still Unknown?
Online assessment advice becomes unreliable when one candidate's experience is presented as company policy. This evidence map separates what CTC or the testing platforms publish from what current applicants are reporting.
| Claim | Evidence status | What it means for you |
|---|---|---|
| CTC uses role-dependent aptitude or coding assessments | Official CTC campus page | Prepare for the assessment named in your own invitation, not another CTC role. |
| Resume review can happen after an assessment is passed | Official CTC campus page | An OA invite or strong score does not guarantee an interview. |
| CCAT has 50 questions in 15 minutes | Official Criteria documentation | Speed, selection, and educated guessing matter more than finishing every item. |
| SWE candidates receive aptitude/behavioral first, then Codility | Multiple current 2027 candidate reports | Use this as the leading 2027 model, but allow for batch differences. |
| Codility has three questions and about three hours | Current and historical candidate reports | Use a three-task mock; do not call it a guaranteed format. |
| Universal CCAT cutoff, Codility cutoff, or response time | Not publicly standardized | Do not trust a single number posted without a current invitation or official source. |
The Most Likely 2027 SWE Intern Assessment Flow
Current Summer 2027 reports point to a practical sequence: application, aptitude and behavioral assessment, Codility coding assessment, continued application review, and then behavioral and technical interviews for selected candidates. The time between stages varies. Some historical candidates received Codility within a day or two of the aptitude test, while others waited longer.
CTC's official campus page uses broader language because it covers several roles. It says the online assessment can test critical thinking or basic programming, then says the company reviews the resume after a passing result. For the Summer 2027 SWE batch, multiple candidates report seeing both kinds of testing rather than only one.
The two-gate sequence is candidate-reported for current SWE applicants. CTC officially confirms role-dependent assessments and post-assessment resume review.
Does everyone get the CTC assessment?
CTC does not publicly say that every applicant receives every assessment. Its campus page says the company will contact applicants it is interested in moving forward with, while the Summer 2027 job posting says each application is assessed against the role's requirements. Current candidates still disagree about which stage is automatic.
The sensible interpretation is that CTC may use more than one filter. An early eligibility or automated check can coexist with a deeper resume review after assessment results arrive. The job posting also discloses that applicant information may be reviewed by automated systems, including AI, but it does not reveal the exact decision rules.
What Is the CTC CCAT?
CCAT stands for Criteria Cognitive Aptitude Test. It is not a coding test and it is not advanced finance math. Criteria's official candidate guide says the test measures problem solving, critical thinking, and the ability to use new information through verbal, numerical, logical, and spatial questions.
You receive 15 minutes for 50 questions, which is fewer than 20 seconds per question on average. Calculators are not allowed. Criteria says fewer than 1% of candidates answer all 50, and there is no penalty for wrong answers, so a strong strategy includes moving on and making an educated guess rather than becoming trapped.
How to pace the 15-minute CCAT
Use practice to build a fast skip decision. If the setup is unclear after one careful read, choose the best available answer and continue. A difficult question can consume the time needed for several easier questions that follow.
Train the three official families separately before mixing them. Review fractions, percentages, ratios, averages, basic algebra, verbal analogies, vocabulary in context, shape rotations, sequences, and odd-one-out patterns. The goal is fluent recognition, not learning a complicated trick during the live test.
On your final two practice runs, reproduce the real constraint: 50 mixed questions, 15 uninterrupted minutes, no calculator. Record where you slowed down and whether the delay came from reading, arithmetic, or indecision. That error log gives you a better plan than chasing an unverified CTC cutoff.
What about the behavioral assessment?
Current SWE candidates commonly mention behavioral or work-style questions alongside the cognitive test. CTC has not published the exact 2027 item count, duration, or scoring rubric. Answer consistently and honestly rather than trying to reverse-engineer a supposedly perfect personality profile.
The official internship description repeatedly emphasizes humility, collaboration, curiosity, communication, and success in a driven team. Those are useful context for understanding the role, but they are not a reason to invent answers that do not match how you actually work.
What to Expect on the CTC Codility Assessment
Several Summer 2027 SWE candidates report a three-question Codility test with a three-hour window. Some finished in roughly 90 to 100 minutes and described the tasks as easier than other trading-firm OAs; another called them medium-ish and more tedious than conceptually obscure. Those comments indicate generous time, not guaranteed easy scoring.
Recent reports do not provide an official 2027 syllabus. A June 2026 associate-engineer account describes logic or simulation, arrays, and stack processing, while older internship reports describe LeetCode-style medium problems. Treat those as pattern clues, not as a list of questions that will repeat.
Why passing the examples is not enough
Codility's official scoring documentation says example cases help explain a task but do not determine the final score. Hidden correctness tests evaluate edge cases, and some tasks also include performance tests for large inputs. The employer's report can show correctness, performance, timeline activity, and similarity signals.
For every task, inspect the largest input before coding. Build tests for the smallest legal input, duplicates, ties, negative or zero values where allowed, already-sorted and reverse-sorted input, and a case large enough to expose a quadratic solution. A solution that passes two examples can still fail the cases that matter.
A three-hour time allocation
Spend the first 10 minutes reading all three prompts and constraints. Choose the clearest complete solution first, not automatically Question 1. A reasonable practice budget is 35 to 45 minutes for the first task, 45 to 55 minutes for the second, and 55 to 65 minutes for the deepest task.
Protect at least 20 minutes for custom tests and complexity repairs. Use a switch rule: if six focused minutes produce no viable invariant, state model, or data structure, move to another problem. Three unfinished attempts create less evidence than two complete, scalable solutions and a thoughtful start on the third.
Do not use one preparation style for all three signals. CCAT tests speed, Codility tests code, and the resume still needs role-specific evidence.
Why a Perfect Codility Score May Not Be Enough
A current 2027 candidate asked whether resume screening happened before or after the OA. Another candidate reported earning a perfect Codility result in a prior cycle without receiving an interview. One anecdote cannot explain the decision, but the official CTC process supplies the missing context: resume review follows a passing assessment.
The Summer 2027 job description asks for more than algorithm speed. It names data structures, object-oriented programming, algorithms applied to real problems, Java/C++/Python experience, written and verbal communication, collaboration, curiosity, and a demonstrated record of success. Your resume should make those signals visible with concrete projects and outcomes.
For each major project, prepare a one-line problem, your specific contribution, one technical decision, a measurable result, and one lesson. Avoid a skills section that lists technologies without proof. If two applicants have similar OA results, stronger evidence of building, testing, learning, and working with others can become decisive.
What Happens After the CTC OA?
CTC's official campus process says selected candidates enter an interview with behavioral and technical portions. The behavioral portion checks values fit, and Software Engineering candidates receive programming questions in the technical portion. CTC does not publish a universal 2027 wait time between OA submission and interview invitation.
While waiting, continue with company-aligned technical practice and build a compact behavioral story bank.
Also be ready to explain why trading technology interests you without pretending to be a finance expert. CTC explicitly says prior finance knowledge is not required. A credible answer can focus on real-time systems, short development cycles, measurable impact, performance constraints, and curiosity about how engineering supports pricing and risk.
A Five-Day CTC OA Preparation Plan
Day 1: Take a timed CCAT diagnostic and classify misses by verbal, math/logic, and spatial reasoning. Practice only the weakest two subtypes afterward. Day 2: Repeat mixed CCAT sets and train your skip rule until one hard item no longer controls the clock.
Day 3: Run three short coding drills across arrays, simulation, and stacks. For each one, state the invariant and complexity before implementation. Day 4: Complete a three-question Codility-style mock in three hours, including at least six custom tests per task.
Day 5: Review mistakes rather than adding a new advanced topic. Verify the deadline, time zone, allowed languages, proctoring or integrity instructions, and permitted resources in your invitation. Then prepare five resume proof points and two behavioral stories for the interview stage.
Chicago Trading Company SWE Intern OA FAQ
Is the first CTC SWE assessment coding?
Current Summer 2027 SWE candidates often report an aptitude and behavioral assessment first, followed by Codility if they advance. CTC's public campus page gives the broader rule that assessments may test critical thinking or basic programming depending on role. Follow the label and instructions in your invitation.
Is the CTC aptitude test the CCAT?
Multiple current candidates identify it as the CCAT, and their description matches Criteria's official 50-question, 15-minute format. The CCAT covers verbal, math and logic, and spatial reasoning. No calculator is allowed, and Criteria says fewer than 1% of candidates answer all 50 questions.
How many questions are on the CTC Codility OA?
Several current 2027 candidates report three coding questions, and historical CTC SWE reports describe the same count. CTC has not published three as a universal specification, so use it for a realistic mock and check your own invitation for the actual format.
What CCAT or Codility score is required?
CTC does not publish a universal cutoff for either stage. Criteria sends employers a CCAT raw score and percentile, while Codility can score correctness and performance. Candidate claims about needing perfection are not official, and a strong score does not replace the later resume and interview decisions.
Does getting the OA mean you passed the resume screen?
No. CTC's official campus process says that after a candidate passes an assessment, the company reviews the resume and reaches out with next steps. Some earlier filtering may occur, but an OA invitation does not prove that the complete application review is finished.
How long does CTC take to respond after Codility?
CTC does not publish a fixed response time. Current candidates report waits ranging from days to multiple weeks, and some do not receive an immediate update despite passing visible tests. Prepare for the technical and behavioral interview, monitor email, and continue other applications while you wait.
Final Takeaway
The Chicago Trading Company SWE Intern OA 2027 is not one test with one strategy. Prepare the CCAT for fast, selective reasoning; prepare Codility for correct and efficient code; and keep strengthening the resume evidence that CTC says it reviews after a passing assessment.
Then carry that evidence into the behavioral and technical interview that may follow.
Sources and Further Reading
- CTC Campus Recruiting and Official Interview Process
- CTC Software Engineering Internship - Summer 2027
- Criteria: What to Expect on the CCAT
- Codility: Reading a Candidate Test Report
- Codility: Automated Scoring Principles
- Current Candidate Discussion: CTC SWE Intern OA 2027
- Current Candidate Discussion: CTC Aptitude and Behavioral Assessment
- Current Candidate Discussion: CTC Codility Timing and Difficulty
Research note: This guide was checked on August 15, 2026. CTC can change assessment order, timers, platform settings, and selection thresholds by role or recruiting batch. Follow your current invitation and treat candidate reports as preparation evidence, not official policy.