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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Fullstack Software Engineer (Ruby/React & TS) - **Company:** PENNYLANE AFFILIATES LLC - **Location:** United States (Remote available) - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Data Analysis, Software Quality, Pair Programming, Ruby on Rails, Ruby, ReactJS - **Published:** September 21, 2026 - **Apply:** https://arc.dev/remote-jobs/j/redirect/plrdyfdbas ## About the Role * Have strong hands-on experience with Ruby on Rails and React (at least 7-8 years) * Combine technical expertise with strong product and business understanding, enjoy solving complex problems and care deeply about your users. * Are a collaborative team player, communicate clearly and take ownership of delivering reliable, pragmatic solutions. * Like being challenged and solving complex problems (accounting is complex in Europe) * Have strong communication skills and are capable of articulating your ideas clearly ## Description 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!, As a Senior Software Engineer at Pennylane, your squad is your primary focus. You will contribute to building reliable, scalable and user-focused products, while helping the engineers around you grow and raising the quality of our technical execution. You will: * 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. * Act as a role model and a driver for other engineers, sharing knowledge, providing actionable feedback and helping the team continuously improve its technical skills and ways of working. * Collaborate effectively with other teams when needed, proactively unblocking technical topics and clearly communicating progress, risks, decisions and results to the relevant stakeholders. * Contribute to the Pennylane tech community, through technical content, onboarding, interviews, incident resolution, tech initiatives, meetups or other community-building activities. ## Related Videos - [Coffee with Developers: David Heinemeier Hansson](https://www.wearedevelopers.com/videos/875-coffee-with-developers-david-heinemeier-hansson) - [Build and Deploy a Fullstack App with Open Source Tooling](https://www.wearedevelopers.com/videos/775-build-and-deploy-a-fullstack-app-with-open-source-tooling) - [Data Science in Retail](https://www.wearedevelopers.com/videos/586-data-science-in-retail) - [Watch Tests Go Brrrr! : Getting Started with Cypress in ReactJS](https://www.wearedevelopers.com/videos/282-watch-tests-go-brrrr-getting-started-with-cypress-in-reactjs) - [Fireside Chat with David Heinemeier Hansson](https://www.wearedevelopers.com/videos/980-fireside-chat-with-david-heinemeier-hansson) - [Breaking Down Silos Between Design and Development ](https://www.wearedevelopers.com/videos/194-breaking-down-silos-between-design-and-development) ## Related Articles - [React Developer Salary [2023]](https://www.wearedevelopers.com/magazine/198-react-developer-salary-2023) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Fullstack Developer Salary UK](https://www.wearedevelopers.com/magazine/251-fullstack-developer-salary-uk) - [Find a Developer Job: 12 Best Job Sites For Developers](https://www.wearedevelopers.com/magazine/165-find-a-developer-job-12-best-job-sites-for-developers) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [16 Best Free React UI Libraries in 2025](https://www.wearedevelopers.com/magazine/148-16-best-free-react-ui-libraries-in-2025)