Senior Software Engineer - Ruby on Rails

Zoolatech; Poland; On-site; PLN 167,000 - 335,000; Full time

Job summary

Zoolatech is seeking an experienced backend engineer to join as an independent contractor. You will build and maintain backend services using Ruby on Rails, evolve a microservice architecture, and ensure scalable and reliable systems.

You will collaborate with data scientists and engineers, participate in code reviews, design testing strategies, and ship high-quality features with end-to-end ownership in a fast-paced environment.

Qualifications

• 5+ years of back-end development with Ruby on Rails.
• Experience building API-based applications.
• Understanding of data structures and distributed microservices.
• Experience with relational databases and SQL (MySQL preferred).
• Bachelor's degree in Computer Science or related field.
• English: active intermediate level or higher.

Responsibilities

• Build and maintain backend services.
• Maintain and evolve microservice architecture (Kafka, GraphQL).
• Design and implement tests and testing strategy.
• Support and troubleshoot production systems.
• Participate in code reviews and design discussions.
• Collaborate cross-functionally with data scientists and engineers.

Skills

Ruby on Rails

API development

Distributed microservices

SQL / MySQL

English (intermediate+)

Education

Bachelor's degree in Computer Science or related field

Tools

GraphQL

AWS

RSpec

CI/CD

Job description

We are a marketplace where users can compare personalized, prequalified rates and quotes from multiple lenders and carriers, for student loans, mortgages, personal loans, and insurance.

We’re challenging the status quo by giving power to the consumer. We believe in a world where ‘ethical’, ‘lending’, and ‘insurance’ can coexist, so we set out to build innovative platforms that actually work for customers. Our mission is to help people find the best loan or insurance policy possible.

We believe researching and buying loans or insurance shouldn’t be confusing or complex, so we’ve focused on simplicity. We’ve created the only unbiased loan and insurance buying process out there, which makes finding options straightforward and clear.

Responsibilities

• Build and maintain backend services
• Maintain and evolve our microservice architecture, including Kafka and GraphQL APIs
• Design and build improvements to our development processes, including testing strategy
• Support and troubleshoot production systems
• Determine operational feasibility by evaluating, analysis, problem definition, requirements, solution development, and proposed solutions
• Participating in the code reviews and design discussions with other engineers
• Have a strong sense of end to end ownership
• Adhere to key principles: Code and design for best performance, scalability and resiliency
• Participate in Agile planning and standup meetings
• Participates in the testing process through test review and analysis, test witnessing and certification of software
• Be a self-starter, capable of solving ambiguous and challenging technical problems with wide scope
• Deliver trustworthy solutions for engineers allowing them to focus on experimentation, evolution, and delivery of high-quality features
• Collaborate cross-functionally with data scientists, business users, project managers and other engineers to achieve elegant solutions
• Backend development including design, documentation, implementation, and testing
• Work alongside other engineers on the team to elevate technology and consistently apply best practices

Skills Required

• 5+ years experience with back-end development using Ruby on Rails.
• Experience building API base applications.
• Understand data structure and distributed system microservice concepts
• Experience with Relational Databases and SQL (MySQL preferred).
• Bachelor's degree in Computer Science, Computer Engineering, or equivalent experience.
• English - active intermediate level or higher.

Nice to have

• Experience with GraphQL.
• Familiarity with cloud platforms and services (AWS preferred) for deploying and managing applications.
• Experience with RSpec or similar unit test frameworks for RoR.
• Understanding Agile methodologies and CI/CD best practices.
• Being ready to work with FE is a plus.

Soft-skills

• Thrive on collaboration; Engineering team works closely with Product Management, Design and Operations for everything from roll-out to feature enhancement.
• Resourceful and mindful; you move fast but don't break things.
• Excellent problem-solving skills and ability to troubleshoot complex issues in a fast-paced environment.
• Excellent communication and collaboration skills to work effectively with multidisciplinary teams.
• Ability to adapt and learn new technologies quickly and independently.
• Ability to solve problems that span multiple interconnected systems/microservices.

Engagement Model: Direct Independent Contractor (Please read carefully)

This is an independent contractor opportunity based on a direct contractual relationship between Zoolatech and the individual service provider.

To facilitate this direct partnership, we engage with professionals who are registered and operate as a sole proprietorship, private entrepreneur, or an equivalent self-employment status in your country.

Please note, our model does not accommodate contracts through third-party intermediaries such as agencies, incubators, or umbrella companies. The essential requirement is your ability to enter into a service agreement and invoice Zoolatech directly. This is not an offer of direct employment

Please note that only candidates whose profiles closely match our requirements will be contacted.