Block Builder / Ethereum Protocol Expert, TLV, 1D Remote

Location: Tel Aviv — hybrid (4 days in office / 1 day remote)

Why join us

We are building a next-generation block builder that augments Ethereums capabilities, unlocks new DeFi
primitives, and improves neutrality while making block participation more accessible. As a Protocol Expert youll
be the steward of protocol-level systems: youll author production-grade Rust services, define how blocks are
constructed and transactions are ordered, own PBS-related integrations, and partner with validators, relays and
searchers — directly shaping ordering and inclusion rules, hardening deterministic simulations and safety checks,
and driving measurable impact across the Ethereum ecosystem.

What youll build

A production-grade block builder platform and the off-chain infrastructure that powers it: block construction
algorithms, secure low-latency builderrelay communication and bundle handling, deterministic simulation and
safety tooling, and rich observability for builder performance and market effects. Crucially, you will also design and
deliver a first-of-its-kind DeFi primitive that depends on our builders augmented capabilities — a concrete,
production-ready demonstration of the platforms unique value to users and the wider ecosystem.

What youll own

You will work on the architecture, implementation, and operator readiness of our block building and off-chain
protocol stack:
Design novel block building mechanisms. Architect algorithms that optimize inclusion guarantees, value
extraction, and latency while preserving fairness and censorship resistance.
Own PBS & MEV-Boost integration. Drive the integration layer with relays and validators, ensuring
compliance, timing correctness, and high availability.
Build builder-relay infra. Implement secure, low-latency builder-relay communication, bundle handling,
and safety checks for real-world operation.
Research and implement ordering strategies. Invent and validate transaction ordering, bundle-inclusion
rules, and timing-game mitigations that expand usable DeFi primitives.
Tooling and monitoring. Create observability, dashboards, market-share trackers, and alerting to measure
builder performance, relay connectivity, and on-chain effects.
Run production builder services. Ensure robust deployments, deterministic simulations, safe rollouts, and
incident runbooks for on-call operation.
Protocol and research leadership. Produce design docs, simulations, and proposals for PBS evolution,
ePBS, and other protocol upgrades; represent the team in protocol discussions.

Required (must-have)

Deep PBS / MEV expertise. Strong practical knowledge of Proposer-Builder Separation, MEV-Boost
architecture, relay ecosystems and timing games.
Ethereum internals. Solid understanding of consensus and execution layers (slots/epochs, fork choice,
payload delivery) and EVM execution semantics.
Strong systems engineering. 7 years software engineering experience, with 3 years focused on
blockchain infrastructure or MEV systems.
Production Rust. Proficiency building high-performance, networked services in Rust.
Operational rigor. Experience running production, security-sensitive infrastructure with monitoring,
testing and on-call responsibilities.
Communication & influence. Able to translate protocol tradeoffs into engineering plans and to coordinate
across relays, searchers and validators.

Strong pluses (nice-to-have)
Prior contributions to MEV-Boost, Flashbots, or other MEV infrastructure.

Operational experience running block builders, relays, or validator integrations.
Published research or talks on PBS, MEV, or Ethereum protocol design.
Familiarity with proposed protocol changes (ePBS, inclusion lists, execution tickets) and prior
protocol-level design work.
Background in low-latency, high-integrity distributed systems (HFT, critical infra).