Senior Blockchain Engineer, Moonshot

As a Senior Blockchain Engineer in Alchemy's Moonshot team, you take new blockchain infrastructure and product ideas from an uncertain problem to a working system. You help choose what to test, build the smallest experiment that answers the important questions, and turn promising results into production software. You work across engineering, Product, and customer-facing teams to identify developer or infrastructure problems that could justify a new blockchain capability.

What you'll do

• Identify developer or infrastructure problems that could justify a new blockchain capability or product, working with engineering, Product, and customer-facing teams.
• Define each experiment's hypothesis, success criteria, constraints, and time limit before building.
• Prototype across the layers the problem requires: blockchain clients, RPC, indexing, transaction infrastructure, backend services, or smart contracts.
• Read protocol specifications and implementation code, then test assumptions with reproducible benchmarks and failure cases.
• Evaluate developer or operational value alongside technical feasibility, security, operating cost, and the effort required to support the system.
• Take validated ideas through production design, testing, rollout, observability, and operational documentation with partner teams.
• Write concise recommendations to continue, change direction, or stop, supported by the experiment's results.
• Participate in production support and incident response for the systems you ship. Own monitoring, runbooks, and fixes after launch.

What you bring

• A track record of taking ambiguous engineering problems through working prototypes and production delivery.
• Deep hands-on knowledge of at least one blockchain: its execution model, transaction lifecycle, state, finality, and failure behavior.
• Strong software engineering skills and experience building backend or distributed systems.
• The ability to read unfamiliar code and specifications, form a testable hypothesis, and design an experiment that can disprove it.
• Experience designing reproducible performance benchmarks and using profiling to distinguish CPU, memory, storage, and network bottlenecks.
• Evidence of careful reasoning about correctness and security, especially where mistakes affect funds or chain state.
• Product judgment: you can explain who needs a capability, what it improves, and whether the result warrants further investment.
• Clear collaboration and documentation so another team can operate or extend what you build.

Nice to have

• Contributions to blockchain clients, protocol implementations, or open-source infrastructure.
• Experience with Rust, Go, C++, or other systems programming languages; smart contract development where relevant.
• Knowledge of EVM implementation, CPU microarchitecture, compiler optimization, or hardware performance counters.
• Experience with RPC performance, transaction submission, simulation, indexing, or cross-chain infrastructure.
• Early-stage product experience where you helped decide what to build and what to stop.

What we offer

• Private health insurance
• Gym reimbursement
• Commuter benefits
• Flexible time off
• In-office group meals
• Learning and development stipend
• Company-sponsored conferences and events
• Books and audiobook subscription with Bookster

About Alchemy

Alchemy is a Web3 infrastructure and developer platform powering millions of users and the world's most innovative blockchain applications. Trusted by JPMorgan, Stripe, Visa, Franklin Templeton, and Nike, and backed by a16z, Coatue, Silver Lake, and Lightspeed, Alchemy provides the infrastructure and tools developers need to build reliable, scalable, and accessible blockchain experiences.