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!

📌 Senior Rust Engineer (Madrid)
🏢 Appodeal
📍 Madrid