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 AdTech 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: GitHub

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 AdTech standards (OpenRTB, 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 general impact in the mobile app industry.
A collaborative and inclusive work culture that values innovation and continuous learning.
Competitive salary, flexible 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!
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📌 Senior Rust Engineer (Barcelona)
🏢 Appodeal
📍 Barcelona