Arm, headquartered in Cambridge, England, designs the processor architecture and the CPU and GPU designs that most smartphones are built on, and licenses them to chipmakers. A large part of Arm's engineering is hardware design and verification; its software engineers work close to that hardware, on compilers, GPU drivers, the Linux kernel, performance analysis and models, and the interviews reflect it. This page covers what Arm builds and who it hires, the process candidates commonly report, the technical depth the teams care about, representative problem types, what interviewers score, and a three-week prep plan.
What Arm builds and who it hires
Arm's software teams build what makes its designs usable. Cambridge postings describe teams that write GPU compute drivers for Mali graphics processors, an LLVM-based compiler for Mali graphics and compute APIs, Linux kernel work including maintaining the upstream Mali GPU driver called panthor, and systems software and performance engineering. These postings ask for C and C++, Linux or Android experience and, for driver and compiler roles, familiarity with LLVM. Arm's hiring page describes the first round as a digital HireVue or telephone interview, followed by interviews with the team that go deeper into the technical side of the role.
- Graphics and GPU software engineers: Mali drivers and graphics and compute APIs.
- Compiler engineers: LLVM-based compilers for Arm CPUs and GPUs.
- Systems software engineers: the Linux kernel, drivers and performance.
- Hardware verification and modelling engineers: verification, models and test infrastructure, a large share of Arm's engineering hiring.
What the process tends to look like
| Stage | What happens | How to prepare |
|---|---|---|
| First round | Arm's hiring page describes a digital HireVue or telephone interview on your interests and technical skills | Short, clear spoken answers about your projects and C or C++ |
| Technical interviews | Live interviews with the team; candidates describe C and C++ language questions, computer architecture, operating systems and résumé deep dives, and some report a C test or a 48-hour C++ assignment followed by a discussion of it | Language corners, architecture and your own code |
| Final interviews | Further technical sessions and a hiring-manager conversation; one Cambridge candidate describes three technical interviewers and a manager | One project explained end to end and how you work in a team |
Processes differ by team, level and office and change over time, so treat this as the common shape candidates report and confirm the specifics with your recruiter.
C and C++, architecture and the systems underneath
Know your language well. Candidates describe many questions on C++ itself, such as smart pointers, and on the odd corners of C: undefined behavior, integer promotion, volatile and what the compiler is allowed to reorder. Our C++ interview questions and C programming interview questions cover the common ones.
Computer architecture. Expect questions on caches and coherence, pipelines, memory ordering and what an instruction set architecture promises. Knowing the basics of the Arm architecture, such as exception levels and the difference between the A, R and M profiles, gives you a concrete vocabulary.
Operating systems. Reports mention deadlock, scheduling and memory management. Kernel and driver roles go further into interrupts, DMA and how a driver talks to a device. Our operating system questions are a good review.
Compilers and performance. Compiler and performance candidates should be able to explain what an optimization pass does, read simple assembly and reason about why one loop runs faster than another on a given core.
Representative problem types
These are the kinds of problems candidates describe, not a leaked question list. Practice the category, not the exact question.
- Explain what a short C snippet prints and why, including undefined behavior.
- Implement a reference-counted smart pointer in C++.
- Write a mutex-protected or lock-free queue and explain memory ordering.
- Detect and avoid deadlock among several threads.
- Reverse bits, count set bits or align an address to a power of two.
- Walk through a cache miss and a context switch step by step.
- Explain an optimization a compiler could apply to a loop.
What interviewers score
- Language precision: exact answers about what C and C++ guarantee and what they leave undefined.
- Architecture intuition: explaining how caches, pipelines and memory ordering affect real code.
- Systems reasoning: following a problem from software down to hardware and back.
- Clarity: explaining a low-level idea simply, which matters at a company whose work is used by partners' engineers.
The behavioral side
Technical rounds decide most outcomes, but every Arm loop also asks about how you work. Prepare a short story for each of these, with a result and what you learned:
- Something you shipped end to end. Cover the user problem, your decisions, what you measured and what you would change.
- A disagreement with a teammate. Show how you made the decision on evidence and kept the relationship.
- Why this company? Connect its product and engineering problems to the work you want to do next.
Structures and sample answers for the common questions are in our software engineer behavioral answers guide.
A three-week prep plan
- Week 1: C and C++ depth: undefined behavior, integer promotion, volatile, move semantics, smart pointers and the memory model, with a reference-counted pointer written from scratch. Our C++ interview questions work as a checklist.
- Week 2: architecture and operating systems: caches, coherence, pipelines and memory ordering, Arm exception levels and profiles, then scheduling, deadlock, interrupts and virtual memory.
- Week 3: your team's domain, whether drivers, compilers or performance, plus a rehearsed walkthrough of your projects and recorded practice of short answers for the HireVue round.
For practice lists, use LeetCode company-tagged questions and the NeetCode 150 roadmap, and compare chip-company loops at NVIDIA and Qualcomm.
Where CoPilot Interview fits
Most of a Arm loop is spoken: you explain an approach, defend a trade-off and talk through your past work. CoPilot Interview is an AI interview assistant whose free AI mock interview builds technical and behavioral questions from your résumé and the job description, reads them aloud and scores each spoken answer out of ten, so you can rehearse the explanation as well as the code. The free plan gives 15 minutes a day of live help in sessions of up to 15 minutes, with AI mock interviews included. Online assessments and many coding rounds forbid outside help, so practice beforehand and follow your employer's rules on the day.
Disclosure: CoPilot Interview is our product, so weigh what we say about it accordingly.
Frequently asked questions
What programming language should I use in a Arm interview?
C and C++ for most software roles, Python for tooling and test, and assembly reading for compiler and performance work. Know C++ well, since candidates report detailed language questions.
Does Arm send an online assessment?
Arm's hiring page describes a first-round HireVue video interview or a phone interview rather than a coding test, and some teams add a C test or a short take-home assignment. Graduate and experienced processes differ, so ask your recruiter.
What is Arm's HireVue interview like?
Arm describes it as a digital first-round interview that looks at your interests and technical skills. You record answers to questions on screen, so practice short, structured spoken answers about your projects and the C or C++ topics in the job description. Our <a href="/blog/hirevue-software-engineer-questions">HireVue software engineer</a> guide covers the format, and our <a href="/blog/arm-interview-process">Arm interview process</a> page covers the wider process.
How should I prepare for Arm coding questions?
Study C and C++ until you can explain undefined behavior, memory ordering and smart pointers without hesitation, then review computer architecture and operating-system fundamentals. Prepare deep walkthroughs of your own projects, practice short recorded answers for the HireVue round, and if your team is compilers or drivers, read up on LLVM or Linux drivers.
Can I use AI tools in a Arm interview?
Only if the instructions you receive say so. Online assessments and live coding rounds generally forbid outside help, and some companies now state their AI policy in the invitation. Use AI to practice beforehand, and follow your employer's rules.
Practice this interview before the real one
The AI mock interview builds questions from your resume and the job description, reads them aloud and scores each spoken answer out of 10. Included on the free plan.
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