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 integral 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!

#J-18808-Ljbffr

📌 Senior Rust Engineer - Barcelona, Cataluña, Spain
🏢 Appodeal
📍 Barcelona