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Selected role

Software Engineer Security

Mistral AI Barcelona/Madrid

$105k - $156k Senior Full-time

About Mistral

At Mistral AI, we believe in the power of AI to simplify tasks, save time, and enhance learning and creativity. Our technology is designed to integrate seamlessly into daily working life.

We democratize AI through high-performance, optimized, open-source and cutting-edge models, products and solutions. Our comprehensive AI platform is designed to meet enterprise needs, whether on-premises or in cloud environments. Our offerings include le Chat, the AI assistant for life and work.

We are a dynamic, collaborative team passionate about AI and its potential to transform society.

Our diverse workforce thrives in competitive environments and is committed to driving innovation. Our teams are distributed between France, USA, UK, Germany and Singapore. We are creative, low-ego and team-spirited.

Join us to be part of a pioneering company shaping the future of AI. Together, we can make a meaningful impact. See more about our culture on https://mistral.ai/careers.

Job Summary

We are seeking a talented and experienced software engineer to join our Engineering team.

You'll work closely with the research, product, solution and program management teams to serve our frontier models to customers wherever they use our technology.

You will be involved in key components of our technology, including model deployment, performance optimization, real time streaming services, DX tools implementation, cloud infrastructure management...

Additionally, you will work to evangelize the Engineering team with best practices in secure coding and architecture.

The role is based in Paris and reports to the Head of Engineering.

What you will do

Software Engineering (80%)

• New model releases: you will ensure fast and reliable launch of new models and new features to customers

• System design and development: help build systems, APIs and interfaces to interact with large language models

• Build and test infrastructure: you will work to improve and extend the infrastructure needed to package, deploy and integrate our core technology within first-party systems and third-party platforms

• Safety: you will help solve the unique challenges that come with maintaining AI safety on third-party platforms

• Observability and Monitoring: you will collaborate closely with both internal and external stakeholders to ensure our services achieve high availability and deliver state-of-the-art performance for our users

• Performance and Resource Optimization: you will be responsible for identifying and solving complex system problems, with the aim to optimize the performance (latency and throughput) of multiple layers of large-scale distributed systems.

Security Focus (20%)

• Security Advocacy: Act as a security advocate within the team, sharing best practices and raising awareness about secure coding principles.

• Secure System Development: Design and implement robust, secure systems, ensuring that all development adheres to the highest security standards.

• Code and Architecture Reviews: Conduct in-depth reviews of code and architectural designs, focusing on identifying and mitigating security vulnerabilities.

• Vulnerability Management: Identify, address, and mitigate vulnerabilities in applications and systems, ensuring proactive measures are in place.

• Cross-Team Collaboration: Work collaboratively across teams to provide security guidance, ensuring security considerations are integrated into development processes.

• Secure Coding Practices: Write secure, maintainable code while considering the broader implications and risks of security decisions.

You may be a good fit if:

• You hold a Master’s degree in Engineering or Computer Science.

• You have a proven experience as a Software Engineer with a focus on backend or fullstack development.

• You have hands-on experience working on security projects, integrating security considerations into software products or a past experience as SRE (Site Reliability Engineering).

• You have strong development skills in Python, with a track record of building and maintaining secure systems.

• You’re able to review code and system architectures with a security-first mindset, identifying risks and proposing solutions.

• You are autonomous and a self-starter.

• You are a proactive problem-solver with a continuous improvement mindset.

Ideally you have

• Familiarity with industry standards for secure software development (e.g., OWASP, ISO 27001).

• Experience with vulnerability scanning tools and secure development lifecycle (SDLC) practices.

Location & Remote

This role is primarily based at our HQ in Paris, France. We will prioritize candidates who either reside in Paris or are open to relocating. We strongly believe in the value of in-person collaboration to foster strong relationships and seamless communication within our team. Our remote work policy is designed to offer flexibility, enhance work-life balance, and boost productivity. The number of remote workdays is determined by each manager, taking into account individual autonomy and specific circumstances—such as increased flexibility during the summer months. Regardless of the arrangement, we expect all employees to maintain open lines of communication with their teams and be available during core working hours.

In certain specific situations, we will also consider remote candidates based in one of the countries listed in this job posting (currently France, UK, Germany, Netherlands, Spain and Italy). In that case, we ask all new hires to visit our Paris office:

• for the first month of their onboarding (accommodation and travelling covered)

• then at least 3 days per month

What we offer

💰 Competitive salary and equity

🧑‍⚕️ Health insurance

🚴 Transportation allowance

🥎 Sport allowance

🥕 Meal vouchers

💰 Private pension plan

🍼 Parental : Generous parental leave policy

🌎 Visa sponsorship

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

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