Software Engineer (Indexer Focus) - Shielded (Web3)

Software Engineer (Indexer Focus) - Shielded

Employment type: Full-time / Company: Input Output

Input Output is building Midnight, a regulatory-friendly, data-protection blockchain that safeguards sensitive commercial and personal data. The role focuses on the Midnight Indexer — a Rust service that streams blockchain data to wallets and end-user applications through a high-performance GraphQL API.

Responsibilities:

- Design, build, and operate Indexer components in Rust: chain indexer, wallet indexer, SPO indexer, and the GraphQL API.
- Build and maintain the data pipeline that fetches blocks/transactions from the Midnight node via subxt, handling finalised-block tracking, backfilling, and continuous indexing.
- Design efficient schemas and queries for PostgreSQL (cloud) and SQLite (standalone) and keep latency and throughput healthy.
- Evolve the GraphQL API (queries, mutations, real-time subscriptions over WebSockets) with correct handling of shielded data and secure wallet sessions.
- Write and maintain unit, integration, and end-to-end tests; prioritise reliability and correctness.
- Own operational quality: observability, containerised deployment (Docker), and incident response.
- Participate in code reviews and technical design discussions; collaborate closely with node, ledger, wallet, and security teams.

Requirements:

- Strong, idiomatic Rust experience — including async/await (tokio) and concurrency.
- Backend / data-systems experience building and operating high-performance services or data pipelines.
- Practical experience with PostgreSQL and/or SQLite: schema design, query optimisation, performance reasoning.
- API design experience; GraphQL knowledge is a plus.
- Solid computer-science fundamentals: data structures, algorithms, and concurrency; engineering discipline with testing and clear technical communication.
- At least 3 years of software development experience, including at least 2 years using Rust; experience with remote collaboration and scale-ups.

Nice to have:

- Substrate / Polkadot ecosystem experience (especially subxt, pallets, runtime development).
- Familiarity with blockchain core concepts: consensus, cryptography, transaction/state models.
- Applied cryptography or zero-knowledge interest/experience.
- WASM and Cardano / partner-chain context.

Stack:

Rust, tokio, subxt, Substrate/Polkadot, PostgreSQL, SQLite, GraphQL, WebSockets, Docker, WASM, Cardano

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