Backend Kotlin Engineer - Mobile (Buenos Aires based)

Arionkoder is an AI consulting firm helping companies build, embed, and own AI systems that drive real business outcomes. We combine Product Development, Artificial Intelligence, and Team Augmentation to craft digital products and solutions that create lasting impact — guided by a human-centric approach and a commitment to pushing the boundaries of what technology can do. We are looking for a Kotlin Engineer (Buenos Aires based) to join Arion's team! We are seeking a Senior Software Engineer to anchor the Mobile Service Layer (MSL), the Backend-for-Frontend (BFF) that serves as the orchestration brain for premium travel applications. This isn’t a traditional CRUD backend role or a pixel-pushing UI position. We seek for an engineer who understands the native mobile lifecycle deeply enough to architect high-performance, mobile-optimized APIs at scale. You will be the technical bridge between native Android and iOS teams and a complex web of travel data partners, ensuring every mobile interaction is fast, reliable, and secure. If you thrive in a fast-paced, collaborative environment and appreciate leveraging your team's expertise to deliver high-quality solutions, this role might be for you! What you'll do: ● Architect the Orchestration Layer: Design and maintain scalable, Kotlin-based APIs that aggregate data from multiple enterprise sources into lean, performant payloads purpose-built for mobile consumption, respecting device constraints like battery, bandwidth, and lifecycle state. ● Own the Integration Contract: Define and evolve the formal API contracts and schema governance that decouple upstream mobile release cycles from internal platform iteration, enabling independent team velocity without sacrificing stability. ● Drive System Performance: Proactively identify and resolve bottlenecks across the API and integration tiers, targeting sub-second response times and high availability within a travel ecosystem that demands real-time pricing, availability, and booking confirmation. ● Collaborative Technical Leadership: Engage in high-level architectural discussions and partner with cross-functional teams (iOS, Android, QA, and external partners) to define, design, and ship features that meet enterprise security and compliance standards. What we're looking for: ● The Hybrid Edge: 7+ years of professional software development experience, including substantial work in server-side Kotlin and deep familiarity with the Android SDK. You understand mobile constraints well enough to build backend services that respect them. ● BFF Pattern Mastery: Proven track record implementing the BFF pattern with RESTful APIs or GraphQL in high-traffic production environments, not toy projects, but systems handling millions of requests with real SLA pressure. ● Architectural Discipline: Comfort operating within established enterprise architectures, navigating complex dependency chains and downstream service tiers, with the judgment to evolve them incrementally without breaking production. ● Modern Stack Proficiency: Deep skill in Kotlin Coroutines and Spring Boot, with the ability to design solutions spanning multiple database systems and asynchronous workflows. ● Agile Execution: You thrive in Agile/Kanban environments and bring the collaborative instincts needed to work alongside external clients, partners, and vendors with competing priorities. ● Ownership Mentality: You don’t wait for tickets. You see systemic issues, propose solutions, and drive them to completion. ● Advanced English level. Perks 💵 Monthly USD Service Fee 🌴 20 business days of paid Agreed Time Off—Annual + 6 Local Holidays 🐣Caregiver Time Off 💻 A dynamic remote work culture. You can work from anywhere! 🚀An entrepreneurial environment. About us In 2010, our founders dreamed up a company that could positively impact the world. Since then, we've been in permanent evolution: from business consulting to innovation and design, and now to building amazing digital products powered…