About the Company: Tools for Humanity (TFH) designs and builds technology behind World. World is building a real human network designed to accelerate people in the age of AI. As bots and autonomous agents reshape the internet, people, institutions, and applications need a trusted way to confirm who is a real human while preserving privacy. The TFH and World tech stacks make this possible: the Orb verifies real, unique people, World ID proves it privately, and World App puts these capabilities, and more, in people’s hands. Together, they add a human layer to an AI-driven internet. World is already running at a global scale. More than 17 million people across 160 countries have verified with World ID, and more new Orb verifications take place each week. World App is already among the most used wallets globally. Developers are integrating World ID to build safer online experiences and create spaces where real people can participate, earn, and be recognized in ways AI simply can’t replicate. Founded in 2019, TFH has more than 400 people across hardware, software, AI, cryptography, mobile engineering, and global operations. Our teams come from OpenAI, Tesla, SpaceX, Apple, Google, Stripe, Meta, Coinbase, Palantir and MIT Media Lab. We’re backed by leading investors, including a16z, Khosla Ventures, Bain Capital Crypto, Blockchain Capital, Variant, Tiger Global, and Coinbase Ventures, as well as prominent operators and founders across fintech and AI. TFH and World have been featured on the cover of TIME Magazine https://time.com/7288387/sam-altman-orb-tools-for-humanity/, highlighted in Fast Company’s https://www.fastcompany.com/91411606/fintech-blockchain-next-big-things-in-tech-2025 Next 5 in Fintech, and explored in a Bloomberg deep dive https://www.bloomberg.com/news/features/2024-08-12/how-worldcoin-is-building-digital-ids-to-combat-the-ai-apocalypse. The New York Times https://www.nytimes.com/2025/05/03/technology/world-eye-scanning-crypto-orbs-launch-in-us.html, Bankless https://www.youtube.com/watch?v=KUcjtFOHgNc and TechCrunch https://techcrunch.com/2025/04/30/world-partners-with-tinder-visa-to-bring-its-id-verifying-tech-to-more-places/ have all recognized our collective progress in identity, cryptography, AI, and global-scale hardware deployment. Our leadership is also named to the Time AI 100 https://time.com/collections/time100-ai-2025/. Learn more about the newest product launches from our Liftoff https://world.org/liftoff event. ABOUT THE TEAM The Crypto Platform team builds and operates the foundational services that power products interacting with World Chain. The team owns the full transaction lifecycle, including state reads, calldata construction, smart contract interactions, backend execution paths, transaction submission, and the high-availability infrastructure required to process transactions reliably at scale. The team also maintains event ingestion and indexing pipelines, using Temporal to provide a consistent, resilient source of truth for downstream systems. Engineers work closely with product teams to ensure wallet features, Mini App integrations, and ERC-4337-based flows remain robust across regions, providers, and failure domains. The team’s mandate also includes broader crypto infrastructure such as RPC load balancing, transaction simulation, security tooling, and multiprovider redundancy. ABOUT THE OPPORTUNITY You will work across crypto platform infrastructure, blockchain engineering, and distributed systems, collaborating closely with product engineers, backend teams, protocol engineers, infrastructure, and security. This role requires strong ownership, sound engineering judgment, and a focus on reliability, as your work will underpin mission-critical features across the organization. About You You can reason clearly about complex systems and enjoy working on difficult problems. You learn new domains quickly, take ownership of the systems you build, and drive projects to completion. You are comfortable operating in unfamiliar territory, whether that involves understanding a new protocol, diagnosing a distributed systems failure, or designing a more reliable transaction execution path. You exercise sound engineering judgment and can turn ambiguity into concrete execution plans. You communicate effectively, collaborate well across disciplines, and maintain high standards for reliability, correctness, and security. Above all, you are curious, driven, and energized by building foundational infrastructure that supports critical product experiences at scale. KEY RESPONSIBILITIES Write clean, efficient, and maintainable code in Go, Rust, and TypeScript. Design and implement highly reliable services for transaction execution, state access, calldata construction, smart contract interaction, and event ingestion. Build and extend secure indexing and data processing pipelines using Temporal as the orchestration layer. Develop and maintain smart contracts required by product workflows. Improve the resilience of blockchain reads and writes through RPC load balancing, failover strategies, multiprovider redundancy, and transaction simulation. Own features from design through deployment, including technical design, documentation, testing, observability, and operational readiness. Partner with product engineering, protocol, infrastructure, and security teams to deliver scalable, fault-tolerant onchain systems. Contribute to monitoring, alerting, incident response, and long-term maintenance of production services. Help define platform abstractions that make it safer and easier for product teams to build onchain experiences. PREFERRED QUALIFICATIONS Experience building production backend systems in Go, Rust, or TypeScript. Experience with distributed systems, reliability engineering, or high-throughput backend services. Familiarity with Ethereum, EVM-based chains, smart contracts, account abstraction, or ERC-4337. Experience with event-driv