Senior Infrastructure Engineer

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

We are looking for a DevOps Engineer to take over our infrastructure and ensure the stability, scalability, and performance of the platform. We operate a monolithic Ruby on Rails application backed by MySQL, which handles hundreds of thousands of transactions per day.

This is a hands-on role for someone who enjoys solving infrastructure challenges, has deep experience with MySQL performance and scaling, and wants to play a key role in helping the company evolve towards a more robust architecture.

We’re looking for someone who can take full ownership of our infrastructure and proactively suggest improvements. You will work closely with the engineering team to ensure everything runs smoothly and can grow at the pace the company requires.

Responsibilities

Identifying and resolving performance bottlenecks in both application and infrastructure.

Maintaining and evolving the infrastructure that supports our Rails application.

Managing, scaling, and optimizing our MySQL databases.

Analyzing and improving database queries, indexing strategies, and schema design.

Designing and maintaining infrastructure as code.

Implementing high availability and disaster recovery strategies.

Classifying alerts and implementing incident response procedures.

Ensuring effective monitoring and alerting systems are in place.

Supporting and improving CI / CD pipelines and automation workflows.

Promoting a culture of reliability, security, and continuous improvement.

You’ll be the main point of contact for infrastructure decisions, working closely with our backend engineers.

Qualifications

Infrastructure & Automation

Hands-on experience with Infrastructure as Code.

Solid understanding of CI / CD concepts and tools.

Proficient in implementing monitoring solutions for application and infrastructure health.

Experience designing and improving log strategies, ensuring they are actionable, structured, and easy to analyze.

Experience in high availability environments, including replication, load balancers, and monitoring.

Experience designing and implementing Disaster Recovery Plans.

Database & Performance

Solid experience with MySQL maintenance and scaling, with a strong focus on performance and stability.

Proven ability to analyze and optimize SQL queries, index usage, and table structures.

Nice to Have

Experience configuring and maintaining Ruby on Rails applications from a DevOps perspective.

Experience working with cloud platforms like AWS.

Knowledge of security best practices in cloud environments.

Hands-on experience with Docker and Kubernetes.

Strong scripting skills.

Working knowledge of NewRelic and Rollbar.

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.

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