Senior Software Engineer, Billing

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.

What you will do

• Billing System Integration: Work on integrating our products with the billing infrastructure, ensuring seamless functionality across offerings
• Interconnection with External Systems: Develop and maintain interfaces between our systems and external platforms like Salesforce and third-party billing systems
• Payment Mechanism Expertise: Analyze and incorporate key payment mechanisms such as VAT compliance, mobile billing (e.g., Play Store), direct invoicing, and payment synchronization with platforms like Stripe
• Billing Processes: Ensure the accuracy and reliability of billing processes, taking into account synchronization challenges and reconciliation across systems
• Scalability and Optimization: Continuously optimize the billing systems to scale with growing demands while ensuring accuracy and efficiency
  
  
  

About You

• Degree in Computer Science, Engineering, or a related field
• You have a proven experience in backend development (Python) and integrating with payment platforms (e.g., Stripe, PayPal)
• You have a strong understanding of billing concepts, including tax regulations, invoicing, and payment processing
• You already worked on billing systems within large-scale SaaS environments, where custom-built billing solutions are often developed to meet complex needs
• You are able to understand and address business challenges related to billing, such as compliance, reconciliation, and payment synchronization
• You’re able to review code and system architectures with a security-first mindset, identifying risks and proposing solutions
• You have strong communication skills to work cross-functionally with teams such as finance, sales, and external vendors to align on billing requirements
  
  
  

Now it would be ideal if you have:

• Familiarity with Salesforce integrations or similar CRM platforms
• Knowledge of global tax and compliance regulations impacting billing in SaaS businesses
  
  
  

Remote

For this role, we do not require you to be based in a specific location outside of the countries listed in this job posting. In return, we expect you to be available for a monthly visit to one of our offices.

If you are based in France 🇫🇷, Germany 🇩🇪, or Spain 🇪🇸, we ask that you be able to come to our Paris office for 3 days each month.

If you are based in the UK 🇬🇧, we ask that you be able to come to our London office for 3 days each month.

Mistral AI will cover 100% of inter-country travel expenses and 50% of intra-country travel expenses.

Onboarding

We require all new hires to come to Paris for the first month when they start.

Hiring Process

• Recruiter Screening (45min)
• Hiring Manager Interview (30min)
• Live-Coding interview - Python (35min)
• System Design Interview (35min)
• Culture-fit discussion (30min)
  
  
  

What we offer

France

💰 Competitive cash salary and equity

🚴 Transportation : Monthly contribution to a mobility pass

🧑‍⚕️ Health : Full health insurance for you and your family

🍼 Parental : Generous parental leave policy

🥎 Sport : Monthly contribution to a Gympass subscription

🥕 Food : Daily lunch vouchers

🌎 Visa sponsorship

UK

💰 Competitive cash salary and equity

🚑 Insurance

🚴 Transportation: Reimburse office parking charges, or 90GBP/month for public transport

🥎 Sport: 90GBP/month reimbursement for gym membership

💰 Pension plan: SmartPension (percentages are 5% Employee & 3% Employer)

Spain

💰 Competitive cash salary and equity

🚑 Insurance

🚴 Transportation allowance

🥎 Sport allowance

🥕 Meal voucher

Germany

💰 Competitive cash salary and equity

🥎 Sport allowance

💰 Private pension plan

🥕 Meal voucher

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.