Remote Senior Software Engineer - Full-Stack Ruby on Rails

Senior Software Engineer - Platform

Location:  Remote

About Monoline

Monoline is redefining the standalone personal umbrella insurance market with an unwavering focus on underwriting excellence, disciplined risk selection, and long-term profitability. Founded by proven entrepreneurs with a track record of successful ventures, Monoline is built on the principles of curiosity, innovation, and customer-centric solutions.

We believe in challenging the status quo, bringing fresh perspectives to a traditional industry, and designing intuitive, straightforward, and consistent products. Our philosophy is rooted in empathy – understanding customer needs to create truly helpful solutions. We lead with gratitude, valuing every detail and the relationships we build along the way.

Our core values guide everything we do:

• People First – We build meaningful relationships, treating our team, partners, and customers with respect and care.

• Positive Presence – We bring energy and optimism to every challenge, fostering a supportive and motivated team culture.

• Batteries Included – We take initiative, think independently, and execute at a high level without waiting for direction.

• Always Curious – We seek knowledge, challenge assumptions, and continuously refine our approach to be the best at what we do.

About the role We are seeking a talented and experienced Full Stack Software Engineer to join our remote team. In this role, you will play a pivotal part in developing and enhancing our platform, working closely with a team of dedicated professionals committed to delivering exceptional user experiences.

Key Responsibilities

• Design and develop Ruby on Rails applications that power our quoting and pricing system, and our underwriting risk assessment platform, with integrated AI capabilities for enhanced decision-making.

• Implement prompt engineering strategies and AI workflow orchestration using industry-standard AI evaluation tools like LangFuse and LangSmith to measure model performance and optimize outputs.

• Collaborate with cross-functional teams to architect full-stack solutions that integrate AI models, intelligent automation, and traditional backend services within a Rails environment.

• Contribute to our platform's core infrastructure, ensuring high performance, scalability, and responsiveness across AI and non-AI systems.

• Lead code reviews, testing, and documentation practices that maintain code quality and establish best practices for AI integration in production systems.

• Stay at the forefront of emerging AI technologies and evaluation frameworks to continuously enhance our platform's capabilities and underwriting accuracy.

Qualifications

• Proven experience as a Senior Software Engineer or similar role with demonstrated expertise in Ruby on Rails development and modern full-stack application architecture.

• Experience with PostgreSQL, Redis, and Docker for building scalable systems.

• Familiarity with cloud services such as AWS and Render.

• Strong understanding of authentication, encryption, and security best practices.

• Excellent problem-solving skills, attention to detail, and ability to think architecturally.

• Strong communication and collaboration abilities in a remote work environment.

• Experience designing and implementing prompt engineering strategies with understanding of how to measure and evaluate AI model outputs.

• Hands-on experience orchestrating AI workflows and integrating AI capabilities into Rails applications.

• Knowledge of building, configuring, and integrating third-party AI models and APIs into software systems.

Why Monoline

Join a founder-led company built on underwriting discipline and long-term profitability. This is a rare opportunity to shape core platform infrastructure and internal tooling from the ground up with real ownership over technical direction. Work alongside a small, high-impact team that values curiosity, clean engineering, and shipping things that matter. Be part of a company committed to becoming the industry leader in standalone personal umbrella insurance.

What We Offer

• Competitive salary paid in USD.

• Annual company performance bonus

• Stock options to share in the company's success.

• Flexible, fully remote work environment.

• Opportunity to be part of a dynamic, innovative team shaping the future of insurtech through AI-driven innovation.

Apply Now

If you’re passionate about building high-quality software and resilient infrastructure, and want to make a meaningful impact in the insurance industry, we’d love to hear from you. Apply today and become a part of Monoline’s exciting journey.

Senior-level Ruby on Rails and full-stack development experience, with PostgreSQL, Redis, Docker, cloud services, security, prompt engineering, AI workflow orchestration, and AI model integration expertise.

Key Responsibilities

• developing applications
• orchestrating workflows
• integrating models

Skills & Tools

Ruby on Rails, PostgreSQL, Redis, Docker, AWS, Render, LangFuse, LangSmith

Job Details

• Category: Software Development
• Seniority: Senior Level
• Commitment: Full Time
• Workplace: Remote — Brazil
• Salary: USD 50,000 – 80,000 / year
• Languages: English

Benefits

• Retirement plan

About Monoline

An insurtech company providing standalone personal umbrella insurance through AI-driven platforms. — Industry: Finance