About the Role
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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

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- 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:

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- 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

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- 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

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- 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

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- 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

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- 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, versátil 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. xhfqzwm

Join us and help shape the future of mobile app success!

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📌 Senior Rust Engineer (Barcelona)
🏢 Appodeal
📍 Barcelona