Senior Software Engineer — RISC-V Instruction Set Simulator (Simulator Engineer)

QUALCOMM, Inc.; Cupertino (CA); On-site; USD 176,000 - 263,000; Full time

Job summary

Qualcomm Technologies, Inc. is building a high-performance RISC-V Instruction Set Simulator (ISS) used as the gold reference model for next-gen 64-bit processors. You will implement ISA features, ensure correct fetch/decode/execute flow, and drive co-simulation with RTL.

The role blends architecture, systems software, and verification engineering with attention to bit-accurate correctness. Applicants should have strong C++ skills, familiarity with processor architecture, and exposure to

Qualifications

• Bachelor's degree with 4+ years in hardware or software engineering.
• Master's degree with 3+ years of relevant experience.
• PhD with 2+ years of relevant experience.

Responsibilities

• Implement the ISA by translating the RISC-V spec into C++.
• Maintain fetch/decode/execute engine and memory/privilege logic.
• Co-simulation with RTL; identify differences one instruction at a time.
• Develop tests to exercise features and verify results against the spec.
• Maintain a suite of simulator extensions and utilities.

Skills

C++ programming

Processor architecture

Python 3

GDB/ELF

Education

Bachelor's degree in EE/CS/CE

Master's degree (optional)

PhD (optional)

Tools

QEMU

Spike

gem5

Linux internals

Job description

Company:Qualcomm Technologies, Inc.Job Area:Engineering Group, Engineering Group > CPU EngineeringGeneral Summary:About the RoleWe are building a high-performance, production-grade RISC-V Instruction Set Simulator (ISS) that serves as the golden reference model for a family of next-generation 64-bit RISC-V processors. The ISS is a key component of our verification flow: it drives co-simulation against RTL, powers random test generation, and gives software teams a fast, accurate platform to develop and debug pre-silicon firmware.The work is at the intersection of computer architecture, systems software, and verification engineering — writing the kind of C++ that has to be both correct to the bit and fast enough to run long-running benchmarks and boot Linux.What You'll Work OnImplementing the ISA: Translate RISC-V specification chapters into working C++ code. We cover a wide range of extensions: integer, floating-point, vector, bit manipulation, security features, interrupt handling, and more.Simulation correctness: Help maintain the fetch/decode/execute engine, memory protection, virtual memory, and privilege-level logic that make the simulator a trustworthy reference.Co-simulation: Work on the harness that runs the ISS alongside RTL and flags any differences, one instruction at a time.Testing: Write targeted unit tests that exercise individual features and compare against expected results derived from the RISC-V spec.Developer tooling: Contribute to and maintain a large collection of simulator extensions and utilities that help the user community be more productive.What We're Looking ForSolid C++ skills and comfort reading unfamiliar codebases.Comfortable with basic processor architecture, including pipelines, memory, privilege levels, and interrupts.Strong attention to detail; this work is spec-driven and correctness matters.Willingness to read a specification document and turn it into tested code.Some exposure to low-level or systems programming, such as embedded systems, operating systems, compilers, or hardware description.Nice to HaveExperience with RISC-V, x86, or ARM architecture.Familiarity with simulators or emulators such as QEMU, Spike, gem5, or similar tools.Experience with GDB, ELF binaries, or bare-metal bring-up.Background in hardware verification or RTL co-simulation.Knowledge of Linux internals.Python 3+ experience.Minimum Qualifications:• Bachelor's degree in Electrical Engineering, Computer Engineering, Computer Science, or related field and 4+ years of Hardware Engineering, Software Engineering, Electrical Engineering, Systems Engineering, or related work experience.ORMaster's degree in Electrical Engineering, Computer Engineering, Computer Science, or related field and 3+ years of Hardware Engineering, Software Engineering, Electrical Engineering, Systems Engineering, or related work experience.ORPhD in Electrical Engineering, Computer Engineering, Computer Science, or related field and 2+ years of Hardware Engineering, Software Engineering, Electrical Engineering, Systems Engineering, or related work experience.Qualcomm is an equal opportunity employer. If you are an individual with a disability and need an accommodation during the application/hiring process, rest assured that Qualcomm is committed to providing an accessible process. You may e-mail [e-mail] or call Qualcomm's toll-free number found here . Upon request, Qualcomm will provide reasonable accommodations to support individuals with disabilities to be able participate in the hiring process. Qualcomm is also committed to making our workplace accessible for individuals with disabilities. (Keep in mind that this email address is used to provide reasonable accommodations for individuals with disabilities. We will not respond here to requests for updates on applications or resume inquiries).To all Staffing and Recruiting Agencies : Our Careers Site is only for individuals seeking a job at Qualcomm. Staffing and recruiting agencies and individuals being represented by an agency are not authorized to use this site or to submit profiles, applications or resumes, and any such submissions will be considered unsolicited. Qualcomm does not accept unsolicited resumes or applications from agencies. Please do not forward resumes to our jobs alias, Qualcomm employees or any other company location. Qualcomm is not responsible for any fees related to unsolicited resumes/applications.EEO Employer: Qualcomm is an equal opportunity employer; all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, Veteran status, or any other protected classification.Qualcomm expects its employees to abide by all applicable policies and procedures, including but not limited to security and other requirements regarding protection of Company confidential information and other confidential and/or proprietary information, to the extent those requirements are permissible under applicable law.Pay range and Other Compensation & Benefits :$175,600.00 - $263,400.00The above pay scale reflects the broad, minimum to maximum, pay scale for this job code for the location for which it has been posted. Even more importantly, please note that salary is only one component of total compensation at Qualcomm. We also offer a competitive annual discretionary bonus program and opportunity for annual RSU grants (employees on sales-incentive plans are not eligible for our annual bonus). In addition, our highly competitive benefits package is designed to support your success at work, at home, and at play. Your recruiter will be happy to discuss all that Qualcomm has to offer – and you can review more details about our US benefits at this link .If you would like more information about this role, please contact Qualcomm Careers .