Senior Backend Engineer (Product)

Finom; Banyoles; On-site; EUR 80,000 - 120,000; Full time

Job summary

Finom is seeking a Senior Backend Engineer who thinks like a product builder and thrives in a collaborative cross-functional team. You’ll own backend systems, focusing on robust, scalable financial infrastructure, in a domain team with frontend, mobile, ML/AI, and QA partners across Europe.

You’ll bring deep .NET/C# expertise, experience with data-intensive apps in regulated environments, and a pragmatist mindset that ships impactful products while maintaining security and quality.

Qualifications

• 5+ years of backend development with a product engineering mindset.
• Deep expertise in .NET and C#, with distributed architectures.
• Experience with data-intensive applications in regulated environments.
• Strong testing and security practices, and shipping quality code.
• Ability to collaborate with product managers, designers, and cross-functional teams.

Responsibilities

• Own the backend systems and services in a product-focused environment.
• Collaborate with frontend, mobile, ML/AI engineers, and QA to deliver end-to-end solutions.
• Design and evolve distributed systems in production.
• Ensure code quality through automated testing and security best practices.

Tools

.NET/C#

PostgreSQL

Redis

RabbitMQ

Kafka

Kubernetes

GCP

React

Swift

Kotlin

Python

Job description

• Maintaining our start-up spirit, we prioritize thorough research, swift implementation of solutions, and ensuring that every effort we make benefits our users, employees, partners, and, of course, our business
• We’re looking for a Senior Backend Engineer who thinks like a product builder, thrives in a collaborative, cross-functional environment, and is passionate about creating robust, scalable financial infrastructure
• You’ll be part of a domain team where various engineering crafts (Backend, Frontend, Mobile, ML/AI engineers, and QA) work together to own and evolve a shared product area that delivers real value to hundreds of thousands of businesses across Europe
• Our tech stack:
• Backend: .NET/C#, PostgreSQL, Redis, RabbitMQ, Kafka, Kubernetes, GCP
• You’ll work alongside teams using React (Web), Swift (iOS) / Kotlin (Android), Python/ML frameworks, and modern test automation tools (Playwright, Appium)

You communicate clearly across disciplines and genuinely enjoy the dynamics of a cross-functional team where everyone contributes to solving the same customer problems. Above all, you’re curious – about the product, the users, the business, and how your technical decisions impact all threeYou’re pragmatic, learn quickly, and have a proven track record of shipping products that matterYou’re comfortable discussing trade-offs with product managers, explaining technical constraints to business stakeholders, and collaborating with frontend and mobile engineers to design elegant end-to-end solutionsAs a product-minded backend engineer, you don’t just implement tickets. You understand the “why” behind what you’re building, challenge assumptions when needed, and proactively identify opportunities to create better outcomesYou have deep expertise in .NET and C# with a strong appreciation for maintainable, scalable code, and distributed architecturesBut more importantly, you know when to apply that expertise and when simpler solutions serve the product better. You’ve built data-intensive applications before and understand the concepts of working in a regulated environmentYou take ownership not just of your code, but of the outcomes. You move without being prompted, whether that’s jumping into a customer issue, improving team processes, or mentoring colleaguesQuality is non-negotiable for you. Automated testing, thorough code reviews, and security best practices are fundamental to how you work. You balance technical excellence with pragmatism, always keeping the end user and business goals in mindHands‑on experience architecting and evolving distributed systems in productionAt least 5 years of professional backend development with a product engineering mindsetProven ability to collaborate effectively with product managers, designers, and engineers from other disciplinesClear, concise communication in English across technical and non-technical audiencesExcellent knowledge of .NET platform and C#A builder’s mentality: you care deeply about shipping great products, not just writing great codeStrong business acumen – you understand how your work connects to company objectivesYou’re curious about adjacent domains – you might peek at the frontend code, ask questions about the ML models, or dive into analytics to understand how features perform