Lead Software Engineer, Mistral AI
Enterprise Systems
Offers equity
Generative AI model developers
Open for applications
Generative AI model developers
101-200 employees
Open for applications
Offers equity
101-200 employees
Company mission
To make frontier AI ubiquitous, and to provide tailor-made AI to all the builders.
Role
Who you are
- Full-stack engineer with strong experience in TypeScript/Node + React or Python (FastAPI) + React/TS; comfortable building web apps end-to-end
- Track record shipping internal systems (APIs, integrations, connectors, dashboards) in enterprise-like environments (banking/insurance/industry/consulting)
- Hands-on and technically strong, with excellent judgment around trade-offs, maintainability, and operational reliability
- Leadership mindset: you’ve led initiatives or mentored engineers (formal or informal) and enjoy setting standards for others
- Strong communication and stakeholder management; you like turning ambiguous problems into a clear plan and shipped software
- Low-ego, team-spirited, autonomous; motivated by enabling others and improving how an organization operates
Desirable
- Experience with LLMs / agentic workflows
- Exposure to market-leading SaaS business systems (Salesforce, Atlassian, Oracle, etc.)
- Familiarity with infra & operations (Docker, CI/CD, K8s…)
- Comfortable working closely with internal stakeholders, including C-levels
What the job involves
- We are seeking a Lead Software Engineer, Enterprise Systems to design, build, and lead the internal systems that power Mistral’s growth
- This is a highly impactful role at the intersection of engineering, finance, data, and operations
- As our first hire in Enterprise Systems, you will ship hands-on (Node/TypeScript + React or Python/FastAPI) while setting the technical direction, partnering with C-level stakeholders, and growing the team over time
- You’ll turn complex workflows into scalable software: integrations, connectors, and dashboards that make information flow across Mistral
- Own the platform from zero: design and implement integrations, connectors, and workflows across internal systems (CRM, billing, HRIS, planning tools)
- Lead the technical direction: define architecture, standards, and best practices for reliability, maintainability, and data consistency
- Stay hands-on : build end-to-end web apps with a pragmatic approach to delivery and iteration
- Stakeholder leadership: partner directly with CFO, CTO and team leads to gather requirements, prioritize, and translate business needs into software
- Enable the org: deliver sleek, self-service tooling and dashboards that reduce manual work and accelerate decision-making across teams
- Lay the foundations to scale: help shape the hiring plan, mentor future teammates, and evolve into the team’s Tech Lead as we grow
Application process
- Introduction call - 30 min
- Hiring Manager interview - 30 min
- Technical Rounds - Live Coding Interview (TypeScript or Python) - 45 min - System Design Interview - 45 min - Optional: Project Deep Dive - 60 min
- Culture-fit discussion - 30 min
- References
Our take
Founded by Facebook AI researchers, Mistral AI focuses on developing open-source generative AI models to "make AI useful." It emerged in early 2023, quickly achieving a $260 million valuation.
With the upcoming release of Mixtral in 2024, featuring up to 176 billion parameters, Mistral is under pressure to deliver. Mixtral's open-source nature has sparked concerns about potential misuse, yet Mistral remains a formidable competitor in the AI landscape, challenging models from Google and Meta.
Recently, Mistral secured a massive $640 million funding round, raising its valuation to $6 billion. This Series A funding, led by General Catalyst and including investors like Lightspeed Venture Partners and Andreessen Horowitz, underscores significant interest in alternatives to ChatGPT.
Freddie
Company Specialist at Welcome to the Jungle
Company
Funding (last 2 of 5 rounds)
Sep 2025
$2.0bn
SERIES C
Jun 2024
$539.2m
SERIES B
Total funding: $3.1bn
Company benefits
- Competitive bonus structure
- Equity
- Opportunities for professional growth and development
Company HQ
Villette, Paris, France
Leadership
Timothee Lacroix
(CTO)Previously PhD and Software Engineer Intern at Facebook and Visiting Undergraduate at CAlab UCSD
Guillaume Lample
(Chief Scientist)Research Student and Scientist at Facebook AI and Research Intern at Jane Street Capital
Arthur Mensch
(CEO)Previously Staff Research Scientist at DeepMind, Post-doc researcher at École normale supérieure, Visiting Researcher at NYU Courant Institute of Mathematical Sciences and PhD Student at Inria
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