Senior Rust Engineer

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

Tech Stack

• Languages: Rust, Python

• Data & Streaming: Kafka, SQL, Redis, ScyllaDB, Delta Lake, Databricks

• Infrastructure: Docker, Kubernetes (on-premise)

• 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

• Strong Python skills

• 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 global 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 oneʼs 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!