Software Engineer - Payments

Summary

Join Sardine, a leader in fraud prevention and AML compliance, as a Backend-focused Software Engineer on the Payments Team. You will design and build APIs, services, and systems for our crypto onramp and offramp infrastructure, working across the stack to launch impactful features and drive scalability. This high-ownership role requires collaboration with cross-functional teams and partners. You will build and maintain backend services, design and implement APIs and data pipelines, and participate in on-call rotation and production support. The ideal candidate has 5+ years of experience in web backend development with proficiency in Ruby. This remote position is based in Brazil, with specific city requirements.

Requirements

• 5+ years of proven experience as a Software Engineer specializing in web backend development
• Proficiency in Ruby (our primary backend language on the Payments Team)
• Experience building APIs, services, and data pipelines
• Strong sense of ownership, with attention to detail and a proactive attitude toward learning and improvement
• Proven ability to deliver high-quality, reliable systems in production environments
• A user-first mindset with strong empathy for customers and their needs
• Proficient in English - from casual chats to formal reports

Responsibilities

• Build and maintain backend services for our crypto onramp/offramp platform used by hundreds of thousands of users worldwide
• Design and implement APIs and data pipelines with a focus on high availability, fault tolerance, and zero downtime
• Collaborate closely with cross-functional teams including product, compliance, and business to launch features end-to-end
• Work with partners and vendors to deliver seamless payment integrations
• Help shape the team’s technical roadmap, improve developer tooling, and optimize internal workflows
• Participate in an on-call rotation and production support to ensure system health and uptime

Preferred Qualifications

• Experience in frontend development
• Relevant industry experience, particularly in crypto, fintech or banking, and domain knowledge in fraud prevention or compliance

Benefits

• Generous compensation in cash and equity
• Early exercise for all options, including pre-vested
• Work from anywhere: Remote-first Culture
• Flexible paid time off, Year-end break, Self care days off
• Health insurance, dental, and vision coverage for employees and dependents - US and Canada specific
• 4% matching in 401k / RRSP - US and Canada specific
• MacBook Pro delivered to your door
• One-time stipend to set up a home office — desk, chair, screen, etc
• Monthly meal stipend
• Monthly social meet-up stipend
• Annual health and wellness stipend
• Annual Learning stipend
• Unlimited access to an expert financial advisory