Overview We are seeking a Senior Formal Verification (FV) Engineer to own the formal verification environment for our next‑generation, high‑performance Out‑of‑Order (OoO) RISC‑V Vector Unit (VU). Reporting directly to the Vector Unit Verification Lead, this is a highly technical individual contributor role.

You will be the dedicated formal expert for the VU team, responsible for designing scalable formal testbenches, writing mathematical properties, and ensuring the absolute algorithmic and architectural integrity of our vector pipeline. You will work side‑by‑side with VU microarchitects to hunt down deep corner‑case bugs and achieve formal sign‑off on high‑complexity arithmetic and execution blocks.

Key Responsibilities Block‑Level Execution & Convergence Engineering (90%)

End‑to‑End Testbench Ownership

Design, deploy, and maintain robust formal verification environments for complex Vector Unit sub‑blocks (e.g., Vector Execution Pipelines, Vector Register File/Rename interfaces, and Vector Floating‑Point Units).

Datapath & Arithmetic Verification:

Implement advanced word‑level modeling, bit‑blasting, and algebraic rewriting strategies to verify complex IEEE‑754 floating‑point and integer vector arithmetic units.

Proof Convergence Management

Independently diagnose and resolve proof‑convergence failures, over‑constraints, and state‑space explosions using advanced reduction techniques (e.g., case‑splitting, black‑boxing, and abstraction modeling).

RISC‑V Vector Compliance

Develop formal environments to mathematically prove that the VU pipeline strictly complies with the RISC‑V Vector (V) Extension specification.

Simulation Partnership





Collaborate closely with VU simulation engineers to define a razor‑sharp boundary between simulation and formal verification, ensuring maximum bug‑hunting efficiency and zero coverage gaps.

Embedded Mentorship & Best Practices (10%)

Formal‑Friendly Design

Partner with VU microarchitects during early‑stage RTL development to drive formal‑friendly coding styles and structural design patterns.

SVA Propagation

Review and refine SystemVerilog Assertions (SVA) written by design and simulation peers, establishing best practices for block‑level assertions within the VU team.

Requirements Must Have

Education

B.S./M.S. in Computer Engineering, Electrical Engineering, or Computer Science with practical industry execution; or a Ph.D. with a research focus on formal methods or computer arithmetic.

Experience

5+ years of production‑grade hardware verification experience (or Ph.D. + 1–3 years) with a strong, proven track record of applying formal verification to CPU, GPU, or DSP execution pipelines.

Collaboration Style

A self‑driven engineer who enjoys deep mathematical puzzles, collaborates seamlessly within a localized block‑level team, and can translate complex proof counter‑examples into actionable bugs for designers.

Datapath Validation Focus

Strong specialization in arithmetic formal verification,



algebraic rewriting, and word‑level modeling. Familiarity with control‑path formal techniques (liveness, safety properties) is highly welcome.

Vector Microarchitecture

Good working knowledge of high‑width execution pipelines, vector execution units, or floating‑point/integer arithmetic hardware. Experience with Out‑of‑Order execution mechanics is a plus.

Formal Tools

Proficient command of commercial EDA formal tools (e.g., Cadence JasperGold/DPV, Synopsys VC Formal, Siemens OneSpin) and their specialized mathematical/datapath apps.

Languages

Native fluency in SystemVerilog and SystemVerilog Assertions (SVA). Scripting proficiency (Python, Tcl, or Bash) for testbench automation.

Nice to Have

RISC‑V Core Verification.

RISC‑V Ecosystem

Familiarity with the RISC‑V Architecture, specifically the Vector (V) and Floating‑Point (F/D) extension ecosystems.

Emulation platforms (Veloce, ZeBu).

Core/Bus interface protocols (e.g., AXI/CHI).

Essential Soft Skills

An adversarial, gap‑seeking mindset

— instinctively asks “who actually checks this?” — with a strong umbrella view of the whole core.

Clear communication across DV, design, and software teams; writes verification plans others can follow.

Why Semidynamics?

Work at one of Europe’s most promising deep‑tech semiconductor scale‑ups.

Accelerated development path.

4 days per week in the Barcelona office (city center), 1 WFH.

1 week of work from everywhere in the world.

Competitive package.

A collaborative, technical, and growth‑oriented environment that values direct ownership and clear thinking.

📌 Senior Formal Verification Engineer - Vector Unit (VU) (Madrid)
🏢 Semidynamics
📍 Madrid