About SiFive
As the pioneers who introduced RISC-V to the world, SiFive is transforming the future of compute by bringing the limitless potential of RISC-V to the highest performance and most data-intensive applications in the world. SiFive's unrivaled compute platforms are continuing to enable leading technology companies around the world to innovate, optimize and deliver the most advanced solutions of tomorrow across every market segment of chip design, including artificial intelligence, machine learning, automotive, data center, mobile, and consumer. With SiFive, the future of RISC-V has no limits.
At SiFive, we are always excited to connect with talented individuals, who are just as passionate about driving innovation and changing the world as we are.
Our constant innovation and ongoing success is down to our amazing teams of incredibly talented people, who collaborate and support each other to come up with truly groundbreaking ideas and solutions. Solutions that will have a huge impact on people's lives; making the world a better place, one processor at a time.
Are you ready
To learn more about SiFive's phenomenal success and to see why we have won the GSA's prestigious Most Respected Private Company Award (for the fourth time!), check out our website and Glassdoor pages.
Job Description:
As part of complex outoforder (OOO) CPU cores verification, we are looking for the role, where you will own verification strategy, methodology, and execution for major core blocks, drive coverage and signoff, and act as a technical leader and mentor within the DV team.
Key Responsibilities
Education & Experience:
- 5+ Years of experience with Bachelor's or Master's in Engineering
Technical Ownership
- Own DV for major OOO core subsystems such as:
- Frontend: fetch, branch prediction, instruction decode.
- Rename / register mapping and dependency tracking.
- Issue queues / schedulers, execution units, bypass networks.
- Reorder buffer (ROB), retirement, exceptions, interrupts, and pipeline flush/replay.
- Loadstore unit (LSU), store buffer, atomics/LRSC, fences, speculative loads/stores.
- L1 caches, TLBs, MMU interfaces, and coherence/protocol interfaces.
- Translate ISA + microarchitecture specifications into detailed verification plans and test strategies.
Testbench & Methodology Leadership
- Architect and implement System Verilog/UVM testbenches for OOO cores and subsystems:
- Reusable UVM environments, agents, monitors, scoreboards, reference models.
- Constrainedrandom and targeted stimulus for OOO corner cases (deep speculation, hazard patterns, reorder stress).
- Define and evolve DV methodology for OOO verification:
- Scenario libraries for speculation, memory ordering, and multicore interactions.
- Reuse patterns across IPs and projects; contribute to common DV infrastructure.
Coverage, Assertions, and Signoff
- Define coverage models and signoff criteria:
- Functional, code, assertion, and scenario coverage for OOO execution and memory model compliance.
- Develop and maintain assertion sets (SVA) for key OOO properties, such as:
- No deadlock/livelock in ROB / scheduler / LSQ.
- Correct branch mispredict, exception, and interrupt recovery.
- Correct loadstore ordering, forwarding, and replay behavior.
- Drive coverage closure and signoff for owned blocks; review and sign off plans/coverage for peer areas when needed.
Debug & CrossFunctional Collaboration
- Lead debug of complex failures:
- Subtle OOO bugs (hazards, wrongpath effects, starvation, corner replay conditions).
- Memory ordering and coherence violations across cores and caches.
- TLB/MMU and privilege/protection corner cases.
- Work closely with:
- Microarchitecture and RTL teams to refine designs for correctness and verifiability.
- Performance/modeling teams to align microarch behavior with models and performance targets.
- Postsilicon teams to reproduce and rootcause silicon issues in presilicon DV.
Mentoring & Influence
- Mentor junior and midlevel DV engineers in:
- OOO microarchitecture concepts and debug.
- Testbench design, stimulus generation, coverage, and methodology.
- Provide technical leadership across projects:
- Lead DV design and reviews, contribute to architecture/microarchitecture reviews from a verification perspective.
- Champion best practices in DV and help set technical direction for core verification.
Additional Information:
This position requires a successful background and reference checks and satisfactory proof of your right to work in:
India
Any offer of employment for this position is also contingent on the Company verifying that you are a authorized for access to export-controlled technology under applicable export control laws or, if you are not already authorized, our ability to successfully obtain any necessary export license(s) or other approvals.
SiFive is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.
