About HeliusHelius is building the core infrastructure for Solana - empowering developers to create the next generation of crypto-powered applications. Our mission is to accelerate the development of internet capital markets by making it easier, faster, and more intuitive to build on-chain.Thousands of teams - from early-stage startups to industry leaders like Coinbase, Phantom, and Jupiter - rely on Helius APIs, webhooks, and indexing tools to power their products. Backed by Haun Ventures, Founders Fund, and Foundation Capital, we’re a small, senior team obsessed with performance, simplicity, and scalability in decentralized systems.Read our Helius Manifesto to see how we work and what we value.About the RoleWe're looking for a Senior Backend Engineer who wants to work on serious infrastructure. This isn't a narrow feature role - you'll own meaningful pieces of the stack, drive technical decisions, and ship production code that gets used immediately. You'll work alongside staff engineers, contribute to architectural discussions, and take end-to-end ownership of projects that directly impact our performance and scalability. Expect high ownership, fast feedback loops, and real impact.About the TeamThe Archival team exposes APIs for querying Solana’s multi-petabyte ledger with sub 100ms latency. If you love the challenge of large datasets and low-latency performance engineering, this is the right team for you. The team moves fast, owns an enormous surface area, and operates like a small group of founders sitting in the critical path of the company.What You'll DoBuild and own ingestion, indexing, and retrieval features across our archival systemsImprove API performance and reliability for high-throughput servicesOptimize query performance and design schemas for databases like ClickHouse, Postgres, and RocksDBCollaborate with staff engineers on caching strategies, scaling patterns, and distributed data architectureDebug, profile, and maintain production systems with a focus on performance and reliabilityParticipate in system design discussions and contribute to technical planningTake ownership of projects from design through deployment and monitoringWhat You'll Bring5+ years of strong backend engineering experience building scalable, high-performance systemsProficiency in Rust (strongly preferred), C++, or an equivalent systems programming languageProfessional experience with distributed systems, data pipelines, and performance-focused engineeringSolid understanding of database schema design and optimization patterns for large datasetsProven ability to break down complex problems into simple, maintainable solutionsStrong debugging and performance profiling skills in production environmentsSelf-driven with the ability to own projects independently and drive them to completionRelentless curiosity and a drive to dive deep into performance optimizationsDesire for a fast-moving, high-ownership environmentNice to HaveExposure to Solana, blockchain, or web3 infrastructureExperience with Postgres, ClickHouse, and/or RocksDBContributions to open source projects or technical communitiesExperience mentoring other engineersWhy Helius?High-impact work: Your code will power applications used by millions across the Solana ecosystem, including Coinbase, Jupiter, and PhantomSerious engineering: Build fast, reliable systems and user experiences across distributed infra, high-throughput backends, and modern frontend stacksOwnership & growth: Lead critical initiatives, influence architecture and product direction, and take on more responsibility as the company scalesRemote-first flexibility: Work where you’re most effective with a flexible, fully distributed teamCompetitive comp & perks: Market-leading salary, meaningful equity, generous vacation, wellness budgets, and support for learning and travelMission-driven team: Join ambitious builders who move fast, take ownership, and are shaping the future of decentralized apps