Senior Backend Software Engineer (Ruby on Rails)

Pennylane SAS; France; Hybrid; EUR 70,000 - 110,000; Full time

Job summary

Pennylane SAS in France seeks a Senior Software Engineer to frame user and product problems, deliver pragmatic, high-quality solutions within a cross-functional squad.

You will lead significant technical deliveries, investigate production issues with observability tools, design robust, scalable components, and raise engineering practices through code reviews, documentation, and RFCs.

Qualifications

• Understand and frame user and product problems.
• Lead significant technical deliveries end-to-end.
• Investigate and resolve production issues using observability tools.
• Design robust, scalable, high-quality solutions.
• Bring deep expertise in at least one major stack area.
• Improve engineering practices with code reviews and RFCs.

Responsibilities

• Understand and frame user and product problems, using product knowledge to help the squad deliver valuable solutions.
• Lead significant technical deliveries within the squad, from problem framing to production operation.
• Investigate and resolve complex production issues using monitoring and data analysis tools.
• Design and evolve robust solutions focusing on performance, scalability and reliability.
• Bring strong expertise in at least one major part of the stack and join new teams autonomously.
• Improve engineering practices across the organization through code reviews, pair programming and RFCs.

Skills

Problem framing

Technical leadership

Production issue resolution

System design

Observability

Autonomy

Job description

Are you looking to have an impact on the daily life of millions of entrepreneurs in France (and tomorrow in Europe)?

Are you looking for a work environment that values trust, proactivity, and autonomy?

Are our Engineering principles aligned with your vision?

Then, Pennylane is the right place for you !

Our vision

We aim to become the most beloved financial Operating System of French SMEs (and soon, European ones).

We help entrepreneurs rid themselves of time-consuming tasks related to accounting and finance while providing them with access to key financial information to assist in making the best decisions for their business.

Simultaneously, we support accounting firms by enabling them to spend less time on redundant and repetitive tasks and more time on advising and supporting their clients. Already, over 1 300,000 small and medium‑sized enterprises (SMEs) and more than 6,500 accounting firms use Pennylane in France!

About us

Pennylane is one of the fastest growing Fintechs in France (and soon to be in Europe!)

• Make ourselves known as a groundbreaking accounting and financial software for small businesses and their accountants

• Raise a total of €400 millions, including from Sequoia, the famous fund from the Silicon Valley who invested early in companies like Google, Facebook, Airbnb, Stripe, Paypal and much more...

• Grow from 7 cofounders to 1100+ happy Pennylaners : we’re now recognized as one of the greatest places to work in France (and also remotely), with a 4.6/5 rating on Glassdoor.

• Build an international environment with more than 25 nationalities, with a strong remote‑friendly culture, where 30% of the employees are already working from all parts of Europe

• Earn the trust of thousands of customers and accounting firms and obtain outstanding ratings

• Already more than 1 300,000 small and medium‑sized enterprises (SMEs) and over 6,500 accounting firms use Pennylane in France!

How you will contribute to the company as a Senior Software Engineer?

• Understand and frame user and product problems, using your product knowledge to help your squad deliver simple, pragmatic and valuable solutions.

• Lead significant technical deliveries within your squad, from understanding the problem to designing, implementing, testing and operating the solution in production.

• Investigate and resolve complex production issues, using monitoring, observability and data analysis tools to identify root causes and prevent recurrence.

• Design and evolve robust solutions, identifying performance, scalability and reliability opportunities and turning them into pragmatic technical improvements.

• Bring strong expertise in at least one major part of our stack, while being able to join a new team and become autonomous on a high‑impact initiative within a few weeks.

• Improve engineering practices across the organization, through high‑quality code reviews, pair programming, documentation, RFCs and the adoption of AI‑assisted development without compromising software quality.

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