Frontend Developer

Backend Rust Developer

Braiins

✨ WHAT AWAITS YOU HERE: As a Backend Rust Developer, you will help build and evolve backend services connected to Braiins Pool, Hashpower, and our hashpower spot market. The role is not only about writing Rust code. We are looking for an engineer who can understand how backend changes, configuration, pricing logic, data flows, and operational behavior can influence the market as a whole. You will work primarily with Rust/Tokio microservices using gRPC/Protocol Buffers, Kafka, PostgreSQL/SQLx, Consul, Vault, Docker, Kubernetes, and GitLab CI/CD. Because the product touches market behavior, availability, user incentives, and data-driven decisions, strong seniority, analytical thinking, and ideally experience with mathematical statistics are more important than narrow specialization in one programming language. Depending on your strengths, you may also touch TypeScript/React frontend code, Python-based tools or legacy services, internal automation, deployment workflows, and AI-assisted development processes.   🤝 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.

Site Reliability Engineer

Braiins

✨ WHAT AWAITS YOU HERE: As a Site Reliability Engineer, you will help us make Braiins Pool and related products faster, safer, and smoother to develop, deploy, and operate. You will work close to backend, frontend, support, and platform teams to improve deployment pipelines, Kubernetes-based delivery, observability, incident handling, internal tooling, and developer experience. This is a hands-on engineering role for someone who enjoys connecting systems, automation, reliability, and practical software development. The role can lean more toward deployment automation, CI/CD, SRE practices, backend tooling, or support enablement depending on your strengths. 🤝 KEY RESPONSIBILITIES: * Improve reliability, operability, and deployment quality of Braiins Pool and related services. * Maintain and optimize GitLab CI/CD pipelines, release workflows, deployment automation, and feedback loops from commit to production. * Work with Kubernetes, Docker, service configuration, secrets, runtime environments, and deployment templates in cooperation with the platform team. * Improve observability, monitoring, alerting, incident response workflows, and post-incident learning. * Build or improve internal tools that help developers, QA, support, and operations work faster and with fewer manual steps. * Help product teams improve local development, testing, deployment safety, release confidence, and production readiness. * Collaborate with support and engineering teams to diagnose production issues and turn recurring problems into automation, documentation, or better tooling. * Contribute to operational runbooks, deployment standards, CI/CD conventions, and shared engineering practices. * 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 SRE, DevOps, production operations, backend tooling, or a similar engineering role. * Strong practical experience with Linux, Docker, Kubernetes, CI/CD pipelines, and production service operations. * Ability to reason about reliability, latency, observability, deployment risk, operational complexity, and supportability. * Good scripting or development skills; enough backend understanding to build tooling, debug services, and improve automation. * Experience improving developer experience, deployment flows, support tooling, or internal operational processes. * Ownership mindset, good communication, and ability to work across development, support, QA, and platform teams. * Willingness to learn our product domain, internal stack, and Bitcoin mining context. 💪 NICE TO HAVE: * Experience with Rust, Python, or TypeScript-based internal tooling. * Experience with Prometheus/Grafana, Sentry, OpenTelemetry, tracing, SLOs, incident management, or production-readiness reviews. * Experience with gRPC/Protocol Buffers, Kafka, PostgreSQL, Consul, Vault, or service discovery patterns. * Experience creating tools for support, QA, operations, or development teams. * Experience in Bitcoin, mining, fintech, infrastructure, or other high-availability domains 🏖 WHAT WE OFFER TO YOU: * Full-time position with flexible working hours. * Possibility to work as an Employee or Freelance. * Indefinite agreement. * For employees, 5 weeks of vacation and 3 sick days. * Company events and weekly Braiins 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. * Work on long-term products in an interesting area of the Bitcoin industry. 🔥 WE WILL LOVE YOU EVEN MORE IF… * You enjoy reducing toil and turning repeated manual work into simple automation. * You have experience in Bitcoin, mining, fintech, infrastructure, or other high-availability domains. * You are interested in AI-assisted engineering workflows and can use them responsibly.

Product Discovery & Prototyping Engineer

Braiins

✨ WHAT AWAITS YOU HERE: As a Product Discovery & Prototyping Engineer, you will help us quickly explore, validate, and shape new product ideas across Braiins Pool, Hashpower, and related products. You will work as a close partner to the product owner, turning business ideas, user problems, requirements, and early designs into clear specifications, experiments, clickable or functional prototypes, and validated product proposals. This role combines analytical thinking, product discovery, data analysis, requirements definition, communication with design and engineering teams, and AI-assisted prototyping. You do not need to be a full-time production developer from day one, but you should be comfortable learning technical tools, using AI responsibly, and building lightweight prototypes that help us decide what is worth building properly.     🤝 KEY RESPONSIBILITIES: * Work closely with the product owner to explore, structure, and validate new product and feature ideas. * Translate business goals, customer problems, and stakeholder input into functional and non-functional requirements. * Create product discovery materials such as problem statements, user stories, acceptance criteria, flows, edge cases, validation plans, and decision records. * Use AI-assisted development and prototyping tools to create quick experiments, mockups, clickable prototypes, scripts, dashboards, or lightweight functional prototypes. * Cooperate with design, backend, frontend, QA, support, and data-oriented stakeholders to clarify feasibility, user value, expected impact, and operational consequences. * Help verify product viability before full engineering investment: user value, complexity, dependencies, supportability, risks, and measurable success criteria. * Query and interpret data from telemetry databases to help to validate ideas. * Document findings clearly so engineering teams can continue from validated discovery into implementation. * Actively improve our discovery and prototyping process, including reusable templates, AI-assisted workflows, and feedback loops. * 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 product analysis, business & data analysis, product ownership, requirements engineering, technical analysis. * Strong analytical thinking and ability to structure ambiguous ideas into clear problems, requirements, assumptions, and next steps. * Experience defining functional and non-functional requirements, acceptance criteria, user flows, edge cases, and product validation approaches. * Ability to communicate with product, design, engineering, QA, support, and business stakeholders. * Ability to query SQL-like queries and interpret data. * Comfort working with technical products where product decisions must consider data flows, operational behavior, constraints, and customer workflows. * Interest in learning AI-assisted prototyping, lightweight coding, scripting, or no-code/low-code tools if you do not already use them. * Strong ownership, curiosity, and ability to move quickly without losing clarity or discipline. * Willingness to understand Bitcoin mining, pool operations, hashpower products, and customer workflows.   💪 NICE TO HAVE * Previous experience with product discovery, technical product management, UX collaboration, or early-stage feature validation. * Experience creating prototypes, internal tools, scripts, dashboards, clickable mockups, or AI-assisted proofs of concept. * Experience with SQL, APIs, data analysis, Figma, Git, Python, TypeScript, or similar tools. * Experience with Bitcoin, cryptocurrencies, mining, fintech, trading, infrastructure, or B2B technical products. * Ability to connect qualitative user feedback with quantitative signals and product metrics.   🏖 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 can move from vague idea to clear prototype or requirement quickly. * You enjoy connecting product thinking with technical feasibility. * You have used AI tools for analysis, prototyping, requirements, or coding assistance. * You are interested in Bitcoin, mining, or technical products with real operational users.