Rust Backend Developer

Key Responsibilities:

• Design, build, maintain, and improve backend services for Braiins Pool, Hashpower, and related market-oriented products.
• Reason about how service behavior, configuration changes, pricing or allocation logic, data quality, latency, and reliability can affect users and market dynamics.
• Work with Rust/Tokio microservices, gRPC/Protocol Buffers, Kafka, PostgreSQL/SQLx, Consul, Vault, Docker, Kubernetes, and GitLab CI/CD.
• Contribute to API design, service communication, data flows, database changes, testing, observability, and production readiness.
• Collaborate with product, analytics, frontend, QA, support, SRE, and platform teams to deliver reliable product changes with clearly understood impact.
• Use data, logs, metrics, experiments, and statistical reasoning to validate assumptions and assess the effect of changes.
• Improve internal Rust libraries, service patterns, development workflows, and shared engineering practices.
• Help maintain or modernize Python-based tools and legacy services where needed.
• Participate in code reviews, technical decisions, refactoring, documentation, and continuous improvement of backend quality.
• Use AI tools responsibly to accelerate research, implementation, testing, documentation, automation, and delivery while keeping strong human ownership, review, security, and production quality.

We are looking for someone with:

• Mid+/Senior experience in backend development, distributed systems, service-oriented architecture, data-intensive products, or similar engineering work.
• Strong engineering judgment and ability to think beyond code: market impact, user incentives, operational risk, configuration effects, and long-term maintainability.
• Experience with production services, APIs, databases, asynchronous or event-driven systems, and message queues.
• Ability to reason with data and metrics; ideally practical experience with mathematical statistics, probability, experiments, forecasting, simulations, or market/data analysis.
• Strong backend/systems experience with clear motivation to work primarily in Rust.
• Good understanding of testing, code review, observability, performance, reliability, and maintainable architecture.
• Ability to work across the full delivery lifecycle: requirements, design, implementation, CI/CD, deployment, monitoring, support, and post-release evaluation.
• Ownership mindset, good communication, and willingness to collaborate across product, analytics, frontend, QA, SRE, and support.
• Willingness to understand Bitcoin mining, pool operations, hashpower products, and our internal service ecosystem.

Nice to have:

• Experience with Rust/Tokio, SQLx, gRPC/Protocol Buffers, Kafka, PostgreSQL, Kubernetes, Consul, Vault, or GitLab CI/CD.
• Experience with market systems, pricing, auctions, financial technology, trading, marketplaces, risk models, or other products where software changes influence economic behavior.
• Experience with statistical analysis, data modeling, experiment evaluation, simulations, or quantitative decision support.
• Experience with Python tools, service migrations, legacy-service modernization, or data-processing scripts.
• Experience with TypeScript/React, protobuf/ConnectRPC APIs, dashboards, or data-heavy user interfaces.
• Experience in Bitcoin, mining, hashpower markets, fintech, infrastructure, or other high-throughput technical domains.

What we offer to you:

• Full-time position with flexible working hours.
• Both possibilities to work as an Employee or Freelance.
• Indefinite agreement.
• For employees 5 weeks of vacation and 3 sick days.
• Company events, and occasional brunches in the office.
• Relaxing room, a shower, and a shared parking spot.
• Modern offices in the center of Prague, Czech Republic — the heart of Europe.  

We will love you even more if…

• You are interested in cryptocurrencies or have active experience with them.
• You are interested in the responsible and effective application of AI tools.