Performance Architect - Modeling and Analysis

About SiFive

SiFive is an idea-to-silicon company founded by the inventors of RISC-V to simplify the design and production of custom SoCs.

As the leading commercial provider of RISC-V processor IP, SiFive is on a mission to help engineers design custom chips for domain-specific solutions for many markets, including 5G, edge AI, enterprise networking, storage, and consumer devices.

Industry-leading innovators, including six of the top ten semiconductor companies, are working with SiFive thanks to our proven success, deep expertise, and rich partner ecosystem. With SiFive’s rich IP ecosystem and accessible design platform, every market has access to the development of workload-focused hardware needed to design next-generation products.

We at SiFive are looking for an experienced Microprocessor Performance Architect who has worked both on Hi-End CPUs, GPUs and SoCs.

Location: The ideal candidate for this position can work out of one of our US offices or remotely from home, collaborating with the HQ in San Mateo, CA. However, all positions are currently remote until further notice.


Person will be responsible for the modeling and analysis of High Performance Next-Generation super-scalar out-of-order RISC-V microprocessors. Candidate should have good knowledge of both Software programming and Hardware microarchitecture.


Require 5+ years of direct industry experience in cycle-level modeling of modern core micro-architectures, preferably using a discrete event simulation (DES) framework


  • Strong foundation in computer architecture of high performance out-of-order CPU designs. Awareness of known industry micro-architectures is a plus.

  • Ability to independently analyze performance bottlenecks in micro-architecture and software stack. Awareness of potential security holes is a plus.

  • Fluency in C++ 17, particularly with regard to standard idioms, templates, template specializations for code optimization, STL containers and basic STL algorithms

  • Conversant in Python, sufficient to be comfortable writing object oriented Python scripts on the order of a few hundred lines of code

  • Strong object-oriented programming (OOP) skills, including encapsulation, class coherency, inheritance and polymorphism

  • Strong Discrete Event Simulation (DES) competency, particularly with regard to DES modeling techniques and best practices

  • Strong software optimization and design skills for code efficiency, algorithms and data structures

  • Familiarity with the Gamma et al Design Patterns and basic UML syntax (e.g. Observer, Composite, Adaptor, Proxy, Facade, etc.)

  • Competency in software engineering best practices needed to maintain and refactor very large object oriented code bases

  • Ability to research known techniques in branch prediction and data prefetching, and synthesize new, implementable approaches using those findings, keeping in mind both the performance uplift and also the implementation considerations for improvements

  • Ability to work independently, but also provide clear progress readouts throughout

  • Ability to use and adapt existing models and modeling infrastructure; ability to create new models if needed

  • Vector

    • Good working knowledge of SIMD ISAs

    • Preferred familiarity with RISC-V Vector, latest spec 1.0

    • Ability to program using assembler to write custom tests for vector analysis

    • Strong knowledge of distributed SIMD hardware designs


  • Familiar with git and branching/forking methodologies

  • Strong background with Linux-based development environments including python/shell programming

SiFive is proud to be an equal employment opportunity workplace. We offer a competitive compensation package that includes flexible paid time off; health, vision and dental benefits; 401(k) plan; employee stock option program, and much more.
We will ensure that individuals with disabilities are provided reasonable accommodation to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment. Please contact us to request accommodation.
If you yearn to be challenged and wish to work in an environment where the boundaries of your creativity and skills will be tested, then SiFive is the place for you!
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Thank you for your interest in SiFive Inc. Please note that SiFive does not accept unsolicited resumes from external agencies unless contracted to fill a specific position. Agencies are hereby specifically directed NOT to contact SiFive employees directly in an attempt to present candidates – all applications must go through SiFive's internal recruiting team. Any third-party resume forwarded by agencies/external recruiters to a SiFive mailing address, fax machine or email address, directly to SiFive employees, or to SiFive's resume database will be considered property of SiFive Inc and treated as a direct application. This exchange does not constitute an agreement between SiFive and the agency/external recruiter. SiFive reserves the right to contact the candidate directly. Employment agencies/external recruiters will receive no compensation from SiFive or its companies.