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Software Engineer (Indexer Focus) - Shielded
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Software Engineer (Indexer Focus) - Shielded
Rust Engineer – Midnight Indexer
Midnight is a regulatory-friendly, data-protection blockchain that safeguards sensitive commercial and personal data, preserving freedoms of association, commerce, and expression for developers, companies, and individuals. We’re looking for a talented Rust engineer to help shape its future and contribute to foundational components.
Your primary focus will be the Midnight Indexer—the Rust-based service that streams blockchain data from Midnight nodes to wallets and end-user applications via a high-performance GraphQL API. It ingests block history, processes it, stores data efficiently (both in PostgreSQL and SQLite), and enables real-time subscriptions with robust wallet integration and privacy guarantees.
While the Indexer will serve as your core working area, our role requires someone propelled by curiosity. As you grow, you’ll tackle adjacent systems, including the Node (Substrate-based), the Ledger (transactions, state, and zero-knowledge proofs), and other components.
Duties
- Design, build, and manage the Indexer’s components: chain indexer, wallet indexer, SPO (Cardano partner-chain) indexer, and GraphQL API, ensuring its architecture remains modular and maintainable.
- Construct and maintain a data pipeline that fetches blocks and transactions from Midnight nodes using subxt, incorporating:
- Tracking finalized blocks
- Gap backfilling for historical data
- Continuous, real-time indexing
- Develop efficient schemas and queries for both PostgreSQL (cloud) and SQLite (standalone), while ensuring sustainability as the chain evolves in scale. Optimise for latency and throughput.
- Evolve the GraphQL API, defining queries, mutations, and WebSocket subscriptions, while considering:
- Secure session handling
- Proper management of shielded (privacy-preserving) data
- Implement and uphold comprehensive testing—unit, integration, and end-to-end tests—with reliability and correctness as top priorities.
- Maintain operational excellence:
- Implement observability for service monitoring.
- Deploy leveraging containerisation (Docker).
- Develop incident response plans.
- Collaborate actively in code reviews, technical design discussions, and cross-domain engineering, working closely with teams responsible for the Node, Ledger, Wallet, and Security.
- Stay current with Rust ecosystem advancements and blockchain innovations, applying knowledge to enhance Midnight’s platform.
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Key Competencies
Core Requirements (Indexer)
Must-Have proficiencies to excel in the Indexer:
- Strong, idiomatic Rust (with proficiency in async/await and concurrency, using tokio).
- Backend/data-systems expertise—experience designing, developing, and operating high-performance backend services or data pipelines in production.
- Database savvy:
- Hands-on experience with PostgreSQL and/or SQLite.
- Schema design, query optimisation, and performance-scaling insights.
- API design expertise—ability to architect and evolve APIs effectively. GraphQL experience is a distinct advantage.
- Solid grasp of computer-science fundamentals, including data structures, algorithms, and concurrency best practices.
- Engineering discipline:
- Comfortable with rigorous testing, meticulous code reviews, and technical articulation.
- Remote collaboration: Proven ability to work effectively asynchronously across time zones.
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Valued (Enables Cross-Stack Contribution)
These aren’t hard requirements but will enable you to contribute beyond the Indexer sooner:
- Familiarity with the Substrate/Polkadot ecosystem, especially subxt, and exposure to pallet and runtime development.
- Understanding of blockchain core concepts: consensus mechanisms, cryptographic protocols, and transaction/state models.
- Interest in applied cryptography or zero-knowledge proofs, relevant to Midnight’s ledger (e.g., transaction structure, state transitions).
- Knowledge of WebAssembly (WASM) and compiling Rust for WebAssembly.
- Exposure to Cardano or partner chains, given Midnight’s integration with Cardano.
Education & Experience
- At least 3 years of professional software development, with 2+ years dedicated to Rust.
- Strong foundation in computer-science fundamentals—particularly in algorithms and data structures.
- Hands-on experience in building and maintaining high-performance systems in Rust.
- Bonus outreach for candidates with blockchain exposure or remote collaboration experience across time zones.
- Preference for developers with experience in fast-scaling startups.
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