Software Engineer – Indexer Focus

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Input Output (IOHK)

WebsiteLinkedInAll Job Openings

201 - 500 employees

Founded 2015

₿ Crypto

🌐 Web 3

Crypto • Web 3

Input Output (IOHK) is a technology company focused on research and development in the field of blockchain and cryptocurrencies. It is known for its key role in developing the Cardano blockchain platform, which aims to offer a more secure and scalable environment for digital transactions and smart contracts. IOHK places a strong emphasis on academic research and peer-reviewed development methods, contributing to its reputation in the blockchain space.

📋 Description

• Design, build, and operate the Indexer’s components in Rust — the chain indexer, the wallet indexer, the SPO indexer (Cardano partner-chain data), and the GraphQL API — keeping the architecture modular and maintainable. • Build and maintain the data pipeline that fetches blocks and transactions from the Midnight node via subxt, handling finalized-block tracking, gap backfilling, and continuous real-time indexing. • Design efficient schemas and queries across PostgreSQL (cloud) and SQLite (standalone), and keep latency and throughput healthy as the chain grows. • Evolve the GraphQL API — queries, mutations, and real-time subscriptions over WebSockets — with care for the wallet model: secure sessions and correct handling of shielded data. • Write and maintain unit, integration, and end-to-end tests; treat reliability and correctness as first-class concerns. • Own operational quality for the service: observability, containerised deployment (Docker), and incident response. • Participate in code reviews and technical design discussions, and collaborate closely with the node, ledger, wallet, and security teams — contributing to those components as you ramp up. • Keep current with developments in Rust and blockchain technology, and apply them to improve the platform.

🎯 Requirements

• At least 3 years of experience in software development, with at least 2 years in the Rust programming language. • Strong understanding of computer science fundamentals, including algorithms and data structures • Experience in developing and maintaining high-performance systems in Rust • Experience with blockchain technology is a plus • Experience in remote work and collaboration across different time zones. • Experience working in scale-ups.