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Software Engineer (Indexer Focus) - Shielded
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Software Engineer (Indexer Focus) - Shielded
Rust Engineer – Midnight Indexer & Blockchain System
About the Role
We are seeking a talent(sic) Rust engineer to help shape the future of Midnight’s products and technology. Midnight is a regulatory-friendly, data-protection blockchain that safeguards sensitive commercial and personal data, protecting fundamental freedoms of association, commerce, and expression for developers, companies, and individuals.
Your primary focus will be the Midnight Indexer—the Rust service that streams blockchain data from Midnight nodes to wallets and end-user applications through a high-performance GraphQL API. It ingests block history, processes it, stores it efficiently across PostgreSQL (cloud) and SQLite (standalone), and serves real-time subscriptions. The Indexer embodimentries wallet integration and privacy guarantees critical to Midnight’s mission.
While the Indexer will be your operating base, we envision a contributor who brings breadth and curiosity across the stack. As you grow, you will have the opportunity to influence adjacent components, such as:
- The Node (our Substrate-based blockchain node)
- The Ledger (transaction structure, state, and zero-knowledge proofs)
We value curiosity and versatility as much as depth in any single component.
Duties
Core Responsibilities for the Indexer
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Design, build, and operate the Indexer’s components in Rust—including:
- The chain indexer
- The wallet indexer
- The SPO indexer (for handling Cardano partner-chain data)
- The GraphQL API
Ensure the architecture remains modular and maintainable over time.
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Develop and maintain the data pipeline that:
- Fetches blocks and transactions from the Midnight node via subxt
- Handles finalized-block tracking, gap backfilling
- Ensures continuous, real-time indexing for reliability
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Optimise database schemas and queries across:
- PostgreSQL (cloud deployment)
- SQLite (standalone use case) Keep an eye on latency and throughput as the chain grows.
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Evolve the GraphQL API, focusing on:
- Queries and mutations
- Real-time subscriptions over WebSockets Special attention must be given to securing sessions and correctly handling shielded data for wallets.
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Write and maintain rigorous tests:
- Unit tests
- Integration tests
- End-to-end tests Treat reliability and correctness as first-class priorities.
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Own operational quality for the service:
- Monitor observability
- Manage containerised deployment (Docker)
- Participate in incident response
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Collaborate closely with:
- The node team
- The ledger team
- The wallet team
- The security team As you ramp up, contribute to multiple components beyond the Indexer.
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Stay current with:
- Rust ecosystem trends
- Blockchain technology advancements Apply critical knowledge to improve the platform.
Competencies (Non-Negotiables for Indexer Focus)
Core Requirements (Rust & Data Infrastructure)
- Proficient in idiomatic Rust, including:
- Async/await (tokio runtime)
- Solid understanding of Rust’s concurrency model
- Experienced building and operating high-performance services or data pipelines in production
- Hands-on experience with:
- PostgreSQL or SQLite:
- Schema design
- Query optimisation
- Performance analysis
- PostgreSQL or SQLite:
- Strong background in API design:
- Designing and evolving APIs (GraphQL experience is a major plus)
- Firm grounding in computer science fundamentals:
- Data structures and algorithms
- Logical reasoning about concurrency under load
- Comfortable with:
- Programming discipline: rigorous unit tests, code reviews, and technical documentation
- Asynchronous collaboration across time zones
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Valued (Enables Contribution Across the Stack)
(Not hard requirements but accelerate ramping on other parts of the system)
- Familiarity with the Substrate/Polkadot ecosystem:
- Deep understanding of subxt, pallets, and runtime mechanics
- Exposure to blockchain core concepts:
- Consensus mechanisms
- Cryptography (best practices, margin of safety)
- Transaction and state models (how chains storage is organised)
- Interest in applied cryptography or zero-knowledge proofs, to engage with:
- Ledger transaction structure
- Proving systems (for data privacy guarantees)
- Experience with WASM for compiling Rust to WebAssembly
- Context on Cardano or other partner chains (Midnight runs as a Cardano partner chain)
Education & Experience
- 3+ years of professional software development
- 2+ years of experience exclusively in Rust
- Proficiency in:
- Algorithms and data structures
- Constructing high-performance Rust systems
- Bonus points for:
- Blockchain (even peripherally)
- Experience in remote, scalable teams across multiple time zones
- Prior work at an emerging blockchain or web3 scale-up org
Join a team that values pragmatism with a vision for a scalable, private, and sovereign data infrastructure.
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