Sleeper

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Sleeper is seeking a Backend Engineer specializing in Risk & Trading to design and implement Python backend services for real-time risk management and trading operations. The role involves building scalable infrastructure for pricing engines, market creation, settlement, and exposure management. Responsibilities include integrating with Elixir services via gRPC/REST, Kafka, and Redis, architecting distributed systems on Google Cloud Platform (GCP) using Pub/Sub, Cloud Run/Kubernetes, and BigQuery, and developing robust monitoring, alerting, and CI/CD pipelines. The engineer will also collaborate with data scientists on model deployment and optimize end-to-end latency, owning projects from ideation to production in high-stakes environments.

About Sleeper Sleeper is a rapidly growing platform for sports fans with messaging and gameplay at its core. While much of our existing infrastructure is Elixir‑driven, this role will focus on Python services that integrate tightly with Elixir, GCP, and our distributed databases. You will collaborate with product, data, and frontend teams to ship user‑facing features that are fair, fast, and resilient.What You’ll Be Doing<ul style="min-height:1.5em"><li>Design &amp; implement Python backend services that power real‑time risk management and trading operations.</li><li>Build scalable infrastructure for pricing engines, market creation, settlement, and exposure management.</li><li>Integrate with our Elixir services via gRPC/REST, Kafka, and Redis to ensure consistency and low‑latency performance.</li><li>Architect distributed systems on Google Cloud Platform (GCP) using Pub/Sub, Cloud Run/Kubernetes, and BigQuery.</li><li>Develop robust monitoring, alerting, and CI/CD pipelines to ensure high availability and quick incident response.</li><li>Collaborate with data scientists on model deployment and optimize end‑to‑end latency from pricing to settlement.</li><li>Own projects from ideation through production, making thoughtful trade‑offs in ambiguous, high‑stakes environments.</li></ul>Who You Are<ul style="min-height:1.5em"><li>4+ years of backend engineering experience with a strong focus on Python (FastAPI, Django, or similar).</li><li>Proven ability to design and operate distributed systems handling high throughput and low latency.</li><li>Experience with message queues/streams (Apache Kafka, Google Pub/Sub) and caching layers (Redis).</li><li>Comfortable interacting with Elixir/Erlang or other functional stacks, or eager to learn.</li><li>Pragmatic engineer who thinks critically about edge cases and failure modes, especially in financial or real‑time systems.</li><li>Calm, methodical, and communicative when incidents occur; you thrive under pressure.</li><li>Preferred Skills (Nice to Have)Prior work with ScyllaDB/Cassandra or other wide‑column distributed databases.</li><li>Familiarity with Rust, Go, or C++ for high‑performance components.</li><li>Knowledge of risk modeling, market‑making algorithms, or sports‑betting infrastructure.</li><li>Hands‑on experience with Kubernetes, GitLab CI, and infrastructure‑as‑code tools (Terraform).</li><li>Deep understanding of observability: Prometheus, Grafana, OpenTelemetry</li></ul>Preferred Skills (Not Required)<ul style="min-height:1.5em"><li>Experience with Elixir, ErlangVM, or other functional programming languages</li><li>Familiarity with ScyllaDB, Cassandra, or other distributed databases</li><li>Experience in financial systems, market making, or real-money gaming infrastructure</li><li>Knowledge of risk modeling, pricing engines, or real-time alerting systems </li></ul>Benefits<ul style="min-height:1.5em"><li>Competitive salary and stock options</li><li>Comprehensive health, dental, and vision insurance</li><li>401(k)</li><li>Flexible working hours and remote work options</li><li>Opportunities for career advancement</li></ul>What we offerSleeper believes in quality over quantity, and intentionally keeps our team small as a result. In past roles, we found it very hard to make a big impact when companies grow too large in size, which has a detrimental effect on the product and the impact any single individual can have. Our team includes designers, engineers, product experts, and finance &amp; operation focused on one thing — connecting people over sports. We believe in fair and equitable pay. Certain locations in the United States require job postings to include a reasonable estimate of the base salary range and/or a general description of benefits and other compensation applicable to the role. Competitive salary plus benefits including Medical, Dental, PTO, 401k. Please note that The salary range for this role takes into account a wide range of factors that are considered in making compensation decisions including, but not limited to, skill sets; experience and training; licensure and certifications; and other business and organizational needs. The policy of Sleeper is to provide equal employment opportunities to all applicants and employees without regard to race, color, creed, religion, sex, sexual orientation, gender identity, marital status, citizenship status, age, national origin, ancestry, disability, veteran status, or any other legally protected status and to affirmatively seek to advance the principles of equal employment opportunity. Sleeper is committed to being an Equal Opportunity Employer and offers opportunities to all job seekers, including job seekers with disabilities. If you are a qualified individual with a disability or a disabled veteran, you may request a reasonable accommodation if you are unable or limited in your ability to use or access the Company’s career webpage as a result of your disability. You may request reasonable accommodations by sending an email to jobs@sleeper.app. Headquartered in Las Vegas, NV, Sleeper is backed by Silicon Valley’s top investors, including Andreessen Horowitz, General Catalyst, and Expa. To learn more, visit us online at:<a target="_blank" rel="noopener noreferrer nofollow" href="http://www.sleeper.com"> www.sleeper.com</a>

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- This assessment gives us an idea of your C++ skills - Companies that evaluate this skillset in interviews: Rockstar Games, Ubisoft, Mayhem Studios, etc. - 10 Multiple Choice questions - Average time to complete: 7 to 10 minutes

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Circles is a decentralized money system where users create personal tokens, secured by a web of trust. It aims to be open, transparent, and fair, strengthening communities. The Senior Backend Developer will design and build the infrastructure for Circles as a trustworthy payment method, focusing on blockchain event indexing, accessible APIs, off-chain data management, and system reliability. The role involves working with TypeScript, C#, SQL, Python, and Rust, collaborating with various teams to ensure a robust and intuitive payment experience.

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Customer Relations Agent

##### What you will doAbout CirclesCircles is a radically different kind of money—issued directly by people, secured cryptographically, and powered by a decentralized web of trust. It’s money as a public good: open, transparent, and fair by design.Instead of banks or gatekeepers, every user creates their personal money in the form of a Token. Trust connections between users weave these individual currencies into a spendable whole. Our vision is money that belongs to people, strengthens communities, and feels natural, intuitive, and fair.We’re a diverse team united by curiosity, idealism, and pragmatism. We build carefully, openly, and always with the community in mind. Everything we make is open-source from day one.About the RoleWe're looking for a senior backend developer to design and build the infrastructure that makes Circles a trustworthy payment method in everyday life. You'll build systems to capture and index blockchain events, create accessible APIs for developers, manage off-chain user data (profiles, trust relationships, group metadata), and ensure the whole system stays reliable—even when the network behaves unpredictably.Our stack is rooted primarily in TypeScript, C#, SQL, and occasionally Python and Rust, but we choose technologies based on their merits, not just habits. You’ll be collaborating closely with our smart-contract developers, frontend engineers, community contributors, and designers.What you’ll do<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Blockchain Data Indexing</li></ul>Build, maintain, and evolve our custom Circles blockchain indexer (Nethermind plugin, C#/.NET) which ingests and organizes events into PostgreSQL. Ensure it stays consistent even through network disruptions, reorganizations, and edge-cases.<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">API & Developer Infrastructure</li></ul>Develop robust APIs (JSON-RPC/HTTP) that enable wallets, community apps, explorers, and analytics dashboards to reliably query Circles data in real-time.<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Web-of-Trust & Pathfinding</li></ul>Extend and tune our pathfinding service to determine viable token-transfer routes through trust connections. Make complex graph computations accessible via clean APIs to power seamless payments and insights.<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Off-chain Data Handling</li></ul>Manage reliable off-chain storage of user profiles, group information, and metadata (IPFS-backed). Ensure efficient storage, fast retrieval, and secure updates.<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Developer SDKs</li></ul>Create and maintain intuitive, strongly-typed backend SDKs to support community developers building apps and integrations on Circles.<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Reliability & Security</li></ul>Design robust services that gracefully handle failures, spikes in traffic, and other real-world scenarios. Implement observability through metrics, logs, and alerts. Ensure sensitive keys and operations remain secure.<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Open Collaboration & Documentation</li></ul>Write clear documentation, share knowledge openly, and actively welcome contributions from our community. Your code and documentation will be public and built for transparency.Initial projects you'll dive into<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Circles Nethermind Indexer:</li></ul>Ensuring reliable, real-time indexing of blockchain events into PostgreSQL.<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Pathfinder Service:</li></ul>Improving the pathfinder service that computes viable transaction paths through the trust network.<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Profiles Backend:</li></ul>Building efficient, secure storage and retrieval mechanisms for off-chain user data (profiles, images, metadata).<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Server-side SDKs:</li></ul>Creating easy-to-use SDKs that enable third-party developers to quickly integrate Circles into their own applications.##### Who you are<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">You have several years (5+) experience building and operating production-grade backend systems.</li></ul><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">You’re strong in TypeScript (Node.js) and comfortable diving into C#/.NET or willing to quickly learn it.</li></ul><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">You have practical experience with SQL (PostgreSQL) and understand how to optimize database performance.</li></ul><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">You’ve previously worked with blockchain indexing, Ethereum JSON-RPC, event-driven systems, or similarly complex backend architectures.</li></ul><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">You build APIs with empathy for the developers who will use them—designing interfaces that feel natural and easy to reason about.</li></ul><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">You thrive in remote, autonomous teams, taking ownership from design through deployment.</li></ul><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">You genuinely care about open-source software and public-good infrastructure.</li></ul>Nice-to-have (but not required)<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Experience with IPFS or decentralized storage.</li></ul><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Experience with community driven projects.</li></ul><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Familiarity with algorithms and graph theory.</li></ul><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Interest in tokenomics, decentralization, or community-driven economics.</li></ul>What we valueWe look beyond specific skills to find people who are thoughtful builders, clear communicators, and passionate collaborators. We value pragmatic idealism and curiosity. If you’ve wrestled with complex systems, navigated ambiguity gracefully, and thoughtfully made trade-offs, you’ll fit right in.##### What we can offer you<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Personal Development: Pursue your professional goals with our support, including personal education budgets and conference allowances. We invest in your growth and learning.</li><li class="leading-relaxed">Innovation and Experimentation: Interested in exploring new ideas? Dedicate your Friday afternoons to research or work on a side project within our ecosystem. We encourage creativity and experimentation.</li><li class="leading-relaxed">Flat Hierarchy: Navigate with ease in our organization. Our flat hierarchy ensures your ideas and contributions are valued and heard, without getting lost in a complex structure.</li><li class="leading-relaxed">Flexible and Remote Work: Not a morning person? No problem! We embrace flexible working schedules and have a long-standing culture of remote work. Balance your professional and personal life in a way that works for you.</li><li class="leading-relaxed">State-of-the-Art Equipment: Receive the latest hardware and all the tools you need. We make sure you're well-equipped to do your best work.</li><li class="leading-relaxed">Growth and Opportunity: Grow with us in an exciting industry. As Gnosis rapidly expands, so do the opportunities for you to make a significant impact. We value initiative and a proactive approach.</li><li class="leading-relaxed">Community and Mission: Join a team that's passionate about our mission and enjoys working together. We’re not just colleagues; we’re a community driven by a shared goal.</li></ul>At Gnosis, we strive to create an inclusive environment that empowers our employees. We believe that our products and services benefit from our diverse backgrounds and experiences and are proud to be an equal opportunity employer: all qualified applicants are considered for positions regardless of race, ethnic origin, age, religion or belief, marital status, gender identification, sexual orientation, or physical ability.

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This assessment gives us an idea of your C++ skills- Companies that evaluate this skillset in interviews: Rockstar Games, Ubisoft, Mayhem Studios, etc.- 10 Multiple Choice questions- Average time to complete: 7 to 10 minutes

Let's assess your Data Structures! - This assessment gives us an idea of your problem solving skills using DSA- Companies that evaluate this skillset in interviews: MPL, LILA Games, GSN Games, etc.- 10 Multiple Choice questions

Data Structures and Algorithms

Let's assess your Programming Patterns! ????- This assessment gives us an idea of your code architecture skills- Companies that evaluate this skillset in interviews: Dirtcube, PTW, Playshifu, etc.

Programming Patterns

Let's assess your OOPs skills! ????- This assessment gives us an idea of your fundamental OOPS concepts and Solid principles skills- Companies that evaluate this skillset in interviews: Hitwicket, GSN Games, Tomo Club, etc.

Object Oriented Programming

Let's assess your Unity Skills ????- This assessment gives us an idea of your Unity fundamentals- Companies you can apply for after taking this assessment: Godspeed games, Salvation Games, nCore Games, etc.