About the Role We are looking for a Senior Rust Engineer to join our Barcelona team and contribute to building high-performance, real-time systems powering our ML-driven Ad Tech platform (Mobile Growth Platform). In this role, you will work on core backend infrastructure and ML platform components, focusing on low-latency, high-load services that process large-scale traffic in real time. You will play a key role in developing and optimizing systems such as real-time applications, feature stores, user identity services, and custom inference layers, ensuring scalability, reliability, and performance. Responsibilities Contribute to the development of real-time applications and ML platform components Build and maintain high-load, low-latency backend services Work on in-house solutions including: Feature stores User identity services Custom inference layer ML platform infrastructure Optimize system performance across on-premise Docker & Kubernetes environments Design and implement solutions for traffic scaling and system reliability Collaborate with ML, data, and engineering teams to support production ML systems Continuously improve system architecture, observability, and efficiency Languages: Rust, Python Tools: Git Hub Requirements 5+ years of experience in software engineering Strong proficiency in Rust or proficiency in C/C++/Zig with willingness to transition to Rust Experience designing and building high-load, performance-critical systems Solid understanding of system design, concurrency,



and performance optimization Basic knowledge of machine learning workflows and tools Nice to Have System programming experience (C, C++, Zig) Experience in ML engineering / MLOps Familiarity with Ad Tech standards (Open RTB, MRAID, VAST) Experience with WASM / WASI Background in distributed systems and real-time processing Location: Barcelona, Spain (office attendance 4 days per week) What We’re Looking For Autonomous and self-driven engineer with strong ownership mindset Passion for engineering excellence, performance, and scalability Interest in ML/AI systems and infrastructure Ability to work independently and make informed decisions Strong collaboration and communication skills Why Join Us Opportunity to work on cutting-edge projects with a global impact in the mobile app industry. A collaborative and inclusive work culture that values innovation and continuous learning. Competitive salary, adaptable work arrangements, and a comprehensive benefits package. Professional development opportunities and career growth prospects within a fast-growing company. We appreciate teamwork, critical thinking, independent decision-making, and standing up for one’s viewpoint. We are looking for talented engineers who are willing to grow, improve and share our values. With an outstanding product and a mission that excites and inspires, Appodeal offers a unique opportunity to make an impact while being part of an amazing team. Join us and help shape the future of mobile app success! #J-18808-Ljbffr

📌 Senior Rust Engineer (Eixample)
🏢 Appodeal
📍 Eixample