Senior Fullstack Software Engineer

unybrands was established in 2020 by a group of partners united by a shared vision: to build the leading next-generation e-commerce platform for micro-brands. Headquartered in Miami, the company has a global presence with teams in Berlin, London, New York, and China. unybrands acquires e-commerce businesses that sell both on and off Amazon. Once acquired, these brands are integrated into unybrands' platform, where operations are optimized, business performance is enhanced, and expansion into new product lines and markets is driven. Currently we have acquired 30 brands including Pet Care, Personal Care, Home Care, Supplements, Baby & Juvenile, Garden & Outdoor, Sports & Fitness, and Home, Lifestyle Culinary & Arts. Through expert management and robust infrastructure, unybrands empowers e-commerce brands to scale and thrive. About The Role Build a greenfield Rust-based operational platform from the ground up. You'll design and deliver end-to-end features powering multi-million-dollar e-commerce operations across Amazon, Shopify, and TikTok. Work across the stack — from React UIs to async Rust services — solving challenging distributed systems problems like rate limiting, durable async workflows, and multi-channel data synchronization. Why You’ll Love This Role Greenfield Rust platform: Help shape architecture and patterns from day oneEnd-to-end ownership: From UI to async backend to production deploymentChallenging problems: Multi-channel synchronization, rate limiting, and distributed reliabilityHigh impact: Your work directly supports millions in e-commerce revenueAutonomous environment: Small team with minimal bureaucracy What You’ll Do Design and implement features end-to-end: React UI, backend APIs, async processing, and data persistenceBuild and maintain integrations with Amazon SP-API, Shopify, TikTok, and other marketplacesArchitect resilient systems that handle eventual consistency, partial failures, and retry logicDevelop queue-based async flows with robust error handling and correlation trackingImplement operational features: multi-channel pricing, inventory sync, and order processingCreate real-time dashboards and monitoring tools for visibility and observabilityParticipate in code reviews, mentor team members, and improve system reliability over time Technical Stack Backend: Rust with Axum (async framework on Tokio)PostgreSQL (GCP Cloud SQL with HA)SQLx for type-safe queries and migrationsRedis Frontend: React with TypeScriptVite, Tailwind CSS, Shadcn Architecture: Modular monolith with async-first designEvent-driven processing (SQS)Durable state workflows Infrastructure: GCP (Cloud SQL, GKE, Cloud Storage)AWS (SQS for notifications)Prometheus + Grafana for monitoring Requirements 7+ years building production web applicationsStrong experience in statically-typed languages (Rust, TypeScript, Go, C#, or Java)Solid background with React or similar modern frontend frameworksDeep understanding of async programming, concurrency, and distributed system conceptsStrong SQL and schema design skillsExperience building and maintaining RESTful APIsExcellent debugging, communication, and problem-solving skills Nice to Have Experience with e-commerce APIs (Amazon SP-API, Shopify, etc.)Background in high-reliability or operational systemsFamiliarity with event-driven design, idempotency, and backpressure handlingExperience with GCP, Kubernetes, or container orchestrationKnowledge of durable state management and crash recovery techniques unybrands is an equal opportunity employer and considers all applicants for employment without any regard to race, skin color, religion, gender identity, sexual orientation, and age. Nor are applicants discriminated against based on disability or protected classes.