Software Engineer

IMPORTANT: This is a part-time, independent contractor role for individuals in the UTC-3 to UTC+2 time zones

Are you passionate about building highly scalable, robust SaaS platforms? Do you thrive on solving complex problems that require integrating sophisticated business logic (like global tax laws) into clean, performant code?

Quaderno is looking for a proactive and detail-oriented 
Software Engineer
 to join our Engineering Team. You will be instrumental in developing the core features that allow our global users to navigate international tax compliance seamlessly. This is a fantastic opportunity for someone eager to build expertise in FinTech and global tax compliance in a fast-paced, remote-first environment.

Responsibilities

This is a hands-on development role where you will be directly contributing to our core application using 
Ruby on Rails
. Your main focus will be:

• Core Feature Development:
   Designing, implementing, and maintaining new features and services for our SaaS product using 
  Ruby and Ruby on Rails
  .
• System Optimization:
   Identifying and addressing performance bottlenecks, optimizing database queries, and ensuring the application scales reliably to handle high transaction volumes globally.
• Compliance Logic Integration:
   Collaborating closely with the Product team to translate complex, constantly changing international tax legislation into accurate, well-tested code.
• Quality Assurance:
   Writing clean, efficient, and well-tested code (utilizing 
  RSpec
   and continuous integration) and actively participating in code reviews to maintain high engineering standards.
• Infrastructure Collaboration:
   Working with DevOps principles to improve deployment pipelines, monitoring, and overall system resilience in our cloud environment

Qualifications

We are seeking a candidate who is deeply committed to writing high-quality code and possesses the following traits and technical qualifications:

Must-haves

• Experience:
   2+ years of professional experience developing and deploying production-grade applications using 
  Ruby on Rails
  .
• Database Expertise:
   Strong proficiency in SQL and experience with MySQL or similar relational databases, including query optimization and schema design.
• SaaS/Web Knowledge:
   Solid understanding of API design (RESTful), background processing (e.g., Sidekiq/Redis), and cloud environments (e.g., AWS).
• Testing Skills:
   Proven ability to write comprehensive unit and integration tests (preferably 
  RSpec
  ) to ensure code reliability and minimize regressions.
• Proactivity:
   A self-starter who takes full ownership of the development lifecycle, from initial design through deployment and monitoring.

Nice to have

• Previous experience in a 
  FinTech, Accounting, or Payments
   sector, particularly dealing with financial data.
• Familiarity with the architecture of high-volume, global 
  SaaS
   business models.
• Experience with 
  JavaScript
   and modern front-end concepts (e.g., React, Vue) to assist with occasional full-stack tasks.
• Contributions to open-source projects or a strong portfolio demonstrating relevant skills.

This role is a unique opportunity to use your 
Ruby on Rails
 expertise to solve globally relevant compliance challenges and play a key role in the success of a mission-critical financial platform.

Benefits

We're committed to building a sustainable company that will continue to grow for decades to come. That means we value work-life balance and invest in our employees' long-term growth.

We offer:

• Work from anywhere in the world in a UTC-3 and UTC+2 time zone as a 
  contractor
  .
• Design your own schedule. Work no more than 20 hours/week.
• Competitive pay based on your skills and location.
• Paid vacation + national holidays.
• 2 annual company retreats to awesome places.
• Great learning experience.
• A passionate and caring team.

About us

Quaderno (a Visma company) is a global, fully remote company. We believe that our way of working, independent of borders and time zones, is the future.

We want to build a work environment where people are happy, productive, and interact well.

We're quite transparent internally. This helps everyone to be part of this journey and make better decisions.

We believe in diversity and we are committed to create a home for everyone, no matter your gender, sexual orientation, ethnicity, race, education, age, or other personal characteristics.

We like to work hard, but we also believe in balance. That's why we only work 
5 really focused hours per day
, ensuring everyone has plenty of time to exercise and enjoy life. No toxic meetings, no endless phone calls, no bullshit. Just focused work. The rest of the day is dedicated to family, friends, pets, and hobbies (you know, the important stuff).

Being part of Quaderno means that you'll become part of a culture that's based on excelling in our craft while also maintaining a healthy work-life balance. You'll join a multicultural development team that's passionate about dealing with large datasets, complex tax rules, and helping thousands of businesses around the world.

Selection process

1. Application

If this role resonates with you, we'd love to hear from you To apply, please complete the application form and include your resume.

2. First interview

If your profile catches our interest, the next step is an introductory call. It's a chance for us to learn about your experience and for you to learn about our team, our culture, and the role itself.

3. Take-home Assignment

We'll send you a role-specific task to complete. This assignment is designed to give you a taste of the work you'd be doing and should take no more than half a day to finish. Please consider whether you can dedicate this time before applying.

4. Technical Review

Once we've reviewed your assignment, selected candidates will be invited to a video call with one of your potential future colleagues. During this one-hour remote interview, we'll discuss your approach to the task, explore your technical expertise, and answer any questions you may have.

5. Interview with the CEO

If you advance to this stage, you'll meet with our CEO for a deeper conversation. This is a chance to discuss your background, learn more about our company culture, review role details, and address any questions you might have.

6. Offer

If everything aligns, congratulations—you'll receive an offer to join our team