Senior Software Engineer - Finance Domain

Factorial

Location
Spain
Job Type
full-time
Salary
€60,500 - €71,500
Posted
June 17, 2025

Job Description

Hello! πŸ‘‹

We're looking for a Senior level Engineer to join in the Finance Domain.

We want someone who will add positively to the team's culture, being fully remote and multi-cultural.

We are looking for profiles that have mastered Ruby on Rails for the backend. For the frontend we are looking for profiles with React, Javascript or Typescript.

Finance Domain πŸ’°
Finance is one of the domains with the highest growth forecast at Factorial.

Its mission is to serve as the backbone of financial operations for companies, encompassing expense management, invoice processing, analytics, payments, card management, and accounting.
By optimizing financial workflows, enhancing operational efficiency, and ensuring compliance with regulatory standards through homologated solutions companies can forget about their papers and processes and focus on making important and informed decisions to adapt to dynamic market conditions effectively, while they can also manage all of the important aspects of their company in our all-in-one solution.

The Engineering team at large

At Factorial, we have a team of +150 very talented fullstack developers. We look for smart people who are curious, proactive and have good soft/communication skills.

We are not looking for a long list of skills and technologies. Our stack is Ruby on Rails for the backend and React/React-native for the clients.

If you’re looking for new challenges in a people-first company regardless where you live, keep reading!

Your profile

  1. You are a team player: You are comfortable helping your teammates, sharing your knowledge, reviewing their code and asking for reviews of your own.
  2. You have a user-centric mindset: You know that the only reason we write code is to help our users to perform their tasks.
  3. You are a learner: you want to improve your skills not only in the engineering field but across any other areas.
  4. You are an owner: You like proposing new hypotheses and being responsible for building, deploying and validating them.
  5. You love understanding: Breaking down complex problems into basic and shareable elements.
  6. You are a polyglot developer: You have experience in several coding languages (especially for backend development), CI/CD tools and cloud technologies.
  7. You are a mentor: You love to share your experience and expertise to help others grow.
  8. You have a couple of years of experience working as a software engineer.
  9. You are comfortable communicating in English

At Factorial we don't evaluate you by the years of experience you have, we evaluate your knowledge and skills. How? We have a Career Path with a rubric framework where we define what is expected for each experience level and skill. This framework allows you to know at which level you're right now and what you need to keep growing. As we love transparency, our Career Path includes the salaries for each level and we share it during the first interview to make sure we're aligned.

For this senior-level position, the annual gross salary is 60,000€ regardless of your location. This includes a base salary of 51,000€ and a variable pay of up to 9,000€ annually (paid quarterly), depending on the company's goals.

Your daily life with us

You’ll start with a 2 weeks onboarding period, where you will:

  1. You will be learning about Factorial, our product, our team, our clients
  2. Pair with each member of the team at least once, to see their current initiatives
  3. Solve low-stake bug tickets or quick wins
  4. Commit early and often thanks to our cloud dev environment
  5. Be fully integrated in the team’s rituals from day 1

A Senior engineer at Factorial influences requirements definition with the PM, and is autonomous to deliver a polished solution that matches those. You participate in the team’s decision through Requests For Comments that you write yourself or reading others’.

You will be a product engineer, taking ownership of big initiatives, and being interested in the outcome, not just the output. About the outcome, you’ll also work with your team members to establish goals and plan a quarterly roadmap, putting special attention to the technical needs of our domain.

You will be involved in customer calls to learn about their pains & needs.

You will review code daily and get feedback on your own code at every pull request, from all team members, including juniors.

You will learn from the entire team, both on technical topics (performance, architecture…) and core skills, in an environment driven by engineering quality. You will also mentor junior team members and help them learn from your experience..

Benefits πŸ’†

We care about people and offer many benefits for employees:

  • High growth, multicultural, and friendly environment 🀝🏽
  • Continuous training and learning based on your needs πŸ€“
  • Alan private health insurance 🩺
  • Healthy life with Gympass (Gyms, pools, outdoor classes) 🧘🏽‍♀️
  • Save expenses with Cobee πŸ’°
  • Language classes with Yolk Academy πŸ‘©πŸ½‍🏫
  • Get the most out of your salary with Payflow

And when at the office...

  • Breakfast in the office and organic fruit 🍏
  • Nora and Apetit discounts 🍱
  • Pet Friendly 🐢

About us πŸš€

Factorial is an all-in-one HR Software fast-growing company founded in 2016. Our mission is to help SMEs automate HR workflows, centralize people data, and make better business decisions. Currently, we serve thousands of customers in over 60 countries worldwide and across industries, and we have built a diverse and multicultural team of over 900 people in our Barcelona, Brazil, Mexico, and US offices. 🌎

Our Values πŸ«€

  • We own it: We take responsibility for every project. We make decisions, not excuses.
  • We learn and teach: We're dedicated to learning something new every day and, above all, sharing it.
  • We partner: Every decision is a team decision. We trust each other.
  • We grow fast: We act fast. We believe that the worst mistake is not learning from them.

Wanna learn more about us? Check our website!

The hiring process

If you apply, here’s what to expect:

  1. A first conversation with our Talent Acquisition Partner. It will be about comparing our expectations and making sure we match on a human level. 
  2. A second conversation with the team’s engineering manager. This is about making sure we can work together. Here you will have a conversation about the team, their needs, your profile and how can you complement it. Expect to have a mix of a human and technical conversation.
  3. A tech interview with three Factorial engineers: that’s a conversation about technology, not an exam or a code review. We’ll ask you to send us a piece of code you’ve written recently and are happy with, to use as a basis for the conversation. If you don’t have anything we’ll share some specifications for you to build, but the focus will be on how you think, not the lines you code.
  4. One last coffee-chat with our CTO, where you can get all the answers about Factorial’s culture, business vision, or anything else that interests you.
  5. And that’s it! Feel free to request any other conversation you want, with team members or to address specific concerns at any time during the process.

 

The whole process is remote, using videoconferencing tools!

🎯 Who is this job for?

This role is ideal for a Senior Full-Stack Engineer with strong Ruby on Rails backend expertise and React/JavaScript/TypeScript frontend skills. Candidates should be product-oriented, experienced in ownership of technical initiatives, and passionate about improving finance workflows. A collaborative, mentoring mindset and experience working in multicultural, remote teams are essential.

πŸ’¬ Potential Interview Questions

  1. How do you design and implement scalable backend systems using Ruby on Rails?
    Structure the app with service objects and concerns, use background jobs for heavy tasks, optimize queries, cache aggressively, and follow RESTful principles for APIs.

  2. What is your approach to building reusable and testable components in React?
    Use functional components with hooks, separate logic with custom hooks, apply PropTypes or TypeScript, and write unit tests with Jest and React Testing Library.

  3. How do you ensure tight integration between a React frontend and a Rails backend?
    Use REST or GraphQL APIs, align data contracts, manage CORS, use serializers in Rails, and handle asynchronous data loading gracefully in React.

  4. How do you approach performance optimization in a financial domain application?
    Profile database queries, use caching (e.g., Redis, fragment caching), paginate data, avoid N+1 queries, and optimize frontend rendering and lazy load heavy components.

  5. What are best practices for maintaining code quality in a full-stack Rails + React project?
    Enforce linters and formatters, use strong typing in React, write RSpec tests for Rails, automate CI/CD pipelines, and conduct regular code reviews.

  6. How do you collaborate with product and design teams to deliver user-centric features?
    Participate in discovery sessions, review wireframes, provide technical feedback early, and iterate quickly with feedback loops post-release.

  7. What techniques do you use for debugging complex issues in a full-stack environment?
    Use logs, browser dev tools, performance profilers, Rails console, database query analysis, and replicate issues in isolated test environments.

  8. How do you contribute to the mentorship and growth of junior engineers?
    Review code with explanations, pair program, guide through architecture decisions, and encourage curiosity and technical discussions.

  9. How do you ensure your features are secure and compliant, particularly in a finance domain?
    Validate input, apply proper authentication/authorization, audit for data privacy, encrypt sensitive data, and follow OWASP and local regulatory guidelines.

  10. What’s your approach to maintaining and evolving a technical roadmap in collaboration with your team?
    Align roadmap with product goals, prioritize tech debt, propose RFCs, involve team in planning, and iterate quarterly based on learnings and metrics.

πŸ“‹ Job Summary

Factorial is hiring a Senior Software Engineer in Spain to help build their growing Finance Domain—covering expense management, payments, and accounting. You'll work remotely on a Ruby on Rails + React stack, owning product features from architecture to deployment. This full-time role offers €60,500–€71,500 annually, strong mentoring culture, and benefits like private health insurance, Gympass, and language classes. Join a people-first, product-driven team transforming how companies manage finance and HR globally.

Required Skills

Ruby on Rails React/React-native

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