• Design application architecture and define complex application structures; • Write clean (SOLID) code, develop reusable modular functions, and optimize performance (complex troubleshooting); • Ensure security, perform deployments via Git (Azure Repos), and drive continuous process improvements.

• Lead the development of core platform services. • Design and build technology to support operations of US Government satellites. • Work as both an individual contributor and a lead for junior engineers.

Role Description Sphinx is hiring a Senior Backend Engineer to join our team, building the next generation of mission planning and command and control software for space communications programs. This team is charged with creating modern, resilient services and capabilities to service the US Government for the next decade and beyond. As a Senior Backend Engineer, you will play a key role in building a cutting-edge communications platform for US government satellites. You'll work as both an individual contributor and a lead for more junior engineers. What you will be focusing on: - Building multi-tenant services on public cloud platforms like AWS - Building, architecting, and consuming APIs and backend services as part of the platform ecosystem with an emphasis on automation, testing, and security - Advocating for improvements to product quality, security, and performance that have a particular impact on your team and others - Supporting junior engineering talent with mentorship or technical guidance - Interacting with customers and partners to help them integrate with our services - Scaling the services and solving interesting Space Communication challenges Qualifications - 5+ years of progressively responsible software engineering experience - Extensive experience with Python, FastAPI, Postgres, AWS, Docker, Kubernetes, and Terraform - Demonstrable in-depth knowledge of at least one commercial cloud platform and its associated services - Led the architecture, development, and building of backend services and APIs to ensure performance, security, and reliability - An ability to successfully own technical problems end-to-end - Excellent communication skills, working with end-users to design and build solutions to their needs - A habit of self-directed learning of new technologies, and the ability to learn quickly and adapt to a fast-paced environment Requirements - Eligibility to obtain and maintain a U.S. security clearance - Must be a U.S. citizen or national, U.S. lawful permanent resident, Refugee under 8 U.S.C. § 1157, or Asylee under 8 U.S.C. § 1158 Benefits - Competitive salary - Meaningful equity ownership - Profit sharing - Employer 401(k) contribution - 100% employer covered medical, dental, and vision insurance for you and your dependents

Role Description Estamos contratando — 2x Sr. Backend Developer | Retorna. Si llevas años construyendo sistemas backend que otros considerarían complejos y ya tienes IA en producción real — no en un side project, no en un prototipo — sigue leyendo. Hoy tenemos dos posiciones abiertas para el mismo perfil senior, en dos equipos distintos: - Sr. Backend Developer — Ops: el equipo que garantiza que cada transacción se ejecute con precisión, trazabilidad y compliance en todos los corredores donde operamos. - Sr. Backend Developer — B2B: el equipo que construye las integraciones y capacidades que permiten a empresas procesar pagos transfronterizos a través de nuestra API. Qualifications - Node.js + TypeScript sólido en backend de alta criticidad. - AWS en producción (Lambda, SQS, SNS, Fargate — lo que aplique). - IA en producción real: agentes autónomos, pipelines RAG, integración de LLMs con guardrails. No notebooks, no demos. Código que hoy está corriendo. - Experiencia diseñando sistemas donde un error tiene consecuencias financieras. - Criterio para construir fail-safe: saber cuándo un agente debe escalar a humano. - 5+ años de experiencia backend con código real bajo la capó. Requirements - Experiencia en fintech, remesas o pagos digitales (nice to have). - Arquitecturas event-driven (Kafka, RabbitMQ) (nice to have). - PostgreSQL con volúmenes transaccionales altos (nice to have). Benefits - 💰 Compensación hasta 4.000 USD/mes según experiencia. - 🌎 100% remoto — desde cualquier país de LATAM o España. - 🏗️ Problemas técnicos de verdad: arquitectura distribuida, alta volumetría, multi-jurisdiccional. - 🤝 Equipo técnico sólido con quien construir, no solo ejecutar. Company Description We facilitate money transfers between countries through easy, fast and secure transactions with fair rates for all levels of the population. 30 second payment experience with the perfect mix between exchange rates, delivery times and trust. - Building the next Unicorn.