Source Job

• Write reliable, secure, and scalable code for Lithic's product platform with minimal tech debt.
• Improve system reliability and participate in team on-call rotation.
• Own projects from planning to launch, including API key management, audit logging, and search.

Lithic is a modern card issuing and processing platform for financial companies to build the future of payments. They are a team of 170+ across 26 states and 7 countries, with a remote-first culture.

• Design highly reliable services capable of handling significant traffic fluctuations.
• Monitor backend performance, identify bottlenecks, and implement effective optimizations.
• Collaborate with cross-functional teams to solve complex technical challenges.

We are a leading global blockchain ecosystem behind the world’s largest cryptocurrency exchange by trading volume and registered users. We are trusted by 300+ million people in 100+ countries and have a flat, innovative culture that values collaboration and autonomy.

• Design, build, and operate backend services for Aave App across onboarding, funding, savings, withdrawals, portfolio data, and customer communications.
• Build transaction-orchestration and indexing services that safely prepare, submit, monitor, and reconcile onchain activity across its full lifecycle.
• Lead technical reviews for high-value systems and improve testing, observability, alerting, incident response, and deployment practices.

Aave Labs builds trusted products that expand access to lending, credit, and savings globally. We are a global team holding a high bar for quality and craftsmanship, turning complex technology into simple and reliable experiences.

• Design, build, and maintain scalable distributed backend systems powering platform and product capabilities.
• Own backend services end-to-end, from architecture to monitoring, while collaborating with product and engineering peers.
• Build and evolve Web3 platform backend components, including protocol integrations and blockchain network support.

Zerion builds backend systems for Web3 infrastructure, powering API and wallet products trusted by 50+ top crypto brands. They have a fully remote team with strong ownership and high code quality, processing over 3.1B requests and supporting 1.7M+ active funded wallets.

• Design and build core systems for our new product from scratch.
• Build low-latency, high-reliability services that interact directly with Solana's transaction and block building pipeline.
• Own critical infrastructure: order routing, execution, real-time market data, and position management.

Jito builds the market layer of Solana, providing execution, capital, and incentive infrastructure for the network's onchain economy. They are a small, profitable company with a lean, high-density team that values ownership, fast execution, and technical excellence.

• Write reliable, secure, scalable code for real-time authorization and fraud-prevention systems.
• Build customer-facing features like rules improvements, velocity controls, and fraud tooling.
• Own projects from planning to launch and participate on on-call rotation.

Lithic is the modern card issuing and processing platform empowering ambitious financial companies to build the future of payments. We are a team of 170+ across 26 states and 7 countries, headquartered in New York City.

• Design and implement low-latency backend systems and APIs for quoting, hedging, and executing across on-chain and traditional trading venues.
• Collaborate with the trading team to define interfaces and workflows between pricing, execution, and market data services.
• Build reconciliation and data-integrity tooling to ensure positions, fills, and PnL consistency across live trading state.

Ondo Finance provides institutional-grade, blockchain-enabled investment products and services, with a technology arm developing DeFi and an asset management arm creating tokenized funds. They are a well-capitalized, fully remote team with members across the U.S., backed by top investors.

• Evolving Supabase Edge Runtime, an open-source Rust-based host that runs Deno isolate and enforces per-request memory and CPU limits.
• Implementing monitoring, alerting, and OpenTelemetry tracing to drive latency and reliability improvements.
• Expanding functions for more use cases like AI inference, MCP servers, and improving developer experience with Supabase CLI.

Supabase is the Postgres development platform, providing a complete backend solution including Database, Auth, Storage, Edge Functions, Realtime, and Vector Search. With a globally distributed team of ~400 members across 60+ countries, they are open-source-first and move fast, building in public.

• Design, build, and operate GitLab Orbit backend services, primarily in Rust, within a distributed, cloud-native environment.
• Improve deployment, monitoring, and operations using Kubernetes, Helm, Terraform, and cloud services from AWS or GCP.
• Automate operational work, strengthen observability, and manage production issues to reduce single points of failure.

GitLab is the intelligent orchestration platform for DevSecOps, helping organizations increase developer productivity, improve operational efficiency, and accelerate digital transformation. Trusted by more than 50 million registered users and over 50% of the Fortune 100, GitLab fosters a high-performance culture driven by shared values and continuous knowledge exchange.

• Architect and develop an end-to-end payment gateway integrating Stripe Connect and Airwallex for global fund flows.
• Design milestone-based escrow and ledgering systems for secure fund management across extended transaction cycles.
• Build scalable financial infrastructure for a B2B SaaS platform enabling cross-border invoicing, payments, and foreign-exchange settlements.

This partner company is building financial infrastructure for complex, high-value, cross-border transactions. They offer a remote work environment and value technical ownership in a rapidly evolving platform.

• Implement and manage the infrastructure stack to enable the engineering team to ship quickly and effectively.
• Proactively identify and eliminate bottlenecks in the devops process to ensure optimal developer velocity.
• Maintain Tempo chain reliability, validator infrastructure, and explorer reliability.

Tempo is a layer-1 blockchain purpose-built for stablecoins and real-world payments, born from Stripe and Paradigm. They are a team of crypto-optimists building infrastructure for onchain payments.

• Design, develop, and launch backend systems at scale using Python or Kotlin.
• Collaborate with team and stakeholders to balance speed and quality while protecting system reliability.
• Contribute to community through growth and development activities and navigate large codebases.

Affirm is reinventing credit to make it more honest and friendly, giving consumers the flexibility to buy now and pay later without hidden fees. They are a remote-first company that values transparency and employee well-being, offering competitive benefits and a collaborative culture.

• Lead cross-cutting initiatives and drive modular backend architecture to improve scalability and developer velocity.
• Set standards for APIs, testing, security, and operability while mentoring engineers and shaping technical direction.
• Own production systems, participate in on-call, and lead AI-assisted engineering workflows with quality and safety guardrails.

GitLab is the intelligent orchestration platform for DevSecOps, helping organizations increase developer productivity and improve operational efficiency. With over 50 million users and trust from more than 50% of the Fortune 100, GitLab fosters a high-performance culture driven by values, continuous knowledge exchange, and AI integration.

• Develop new products and features on the Gemini platform within tight-knit teams.
• Write automated tests and collaborate with QA to ensure correct operation of features.
• Review code for correctness, style, and security concerns.

Gemini is a global crypto and Web3 platform founded in 2014, offering crypto products and services in over 70 countries. As a publicly traded company, it focuses on bridging traditional finance with the cryptoeconomy.

• Design and build highly scalable distributed systems to support global expansion across multiple countries and regulatory environments.
• Partner closely with product, operations, payments, logistics, and platform teams to own critical operational and transactional systems.
• Work on cross-border transaction infrastructure, tax and regulatory compliance, international post-purchase experiences, and marketplace operational tooling.

Whatnot is the largest live shopping platform in North America and Europe, enabling sellers to build businesses across hundreds of categories. They are a remote co-located team with hubs across the US, UK, Ireland, Poland, Germany, and Australia, and were recently named the #1 Best Startup Employer in America.

• Design and build agent runtime infrastructure with Firecracker, Rust, and Go
• Define and enforce security boundaries for running untrusted AI agents
• Architect global scale distributed systems for scheduling and orchestration

We build agent sandboxes—runtime infrastructure that is fast, durable, and secure by default for AI systems. We are a small, globally distributed team based in San Francisco backed by forward-thinking investors.

• Design and build distributed data systems handling large-scale ingestion and processing.
• Drive architectural decisions and take end-to-end ownership of critical components.
• Collaborate with product teams to translate ambiguous requirements into robust technical solutions.

Our partner builds a large-scale, multi-chain data platform that ingests, models, and delivers blockchain data to users and developers. They are a remote-first, distributed team with a strong engineering culture focused on ownership and collaboration.

• Set technical strategy for your team on a year-long scale, driving business-impacting projects.
• Collaborate across teams with product, design, and analytics to ensure technical sustainability.
• Foster a culture of quality and ownership through code review standards and technical advocacy.

Affirm is a financial technology company that offers buy now, pay later services, aiming to make credit more honest and friendly. It is a large public company with a global team and a culture focused on innovation, inclusion, and employee well-being.

• Lead a backend engineering team focused on building and scaling microservices, data pipelines, and APIs for a critical cybersecurity platform.
• Mentor engineers and champion technical vision, ensuring reliability, scalability, and production-grade development.
• Collaborate cross-functionally with product and engineering leadership to translate objectives into scalable solutions.

This position is listed on behalf of a partner company, which manages all applications and next steps. The environment is remote-first, mission-driven, and highly collaborative, with teams working across multiple regions.

• Build and maintain backend services for our LLM gateway, including routing, rate limiting, and observability.
• Contribute to sandboxing and isolation infrastructure for safe agent-generated code execution.
• Write high-performance backend code in Go, Rust, or async Python, supporting Kubernetes-based platform services.

AZX accelerates positive impact in critical industries through AI transformation. Founded in 2024 and profitable from the start, we work with category leaders in real estate, energy, logistics, and utilities.