Sr. Software Engineer (full stack)

Location: Remote – Latin America (El Salvador, Guatemala, Costa Rica, Honduras, or Panama)

Company: Sapphire Labs

Company Description

Sapphire Labs is an innovation services firm that helps financial and enterprise clients accelerate their technology roadmap. We design and build cloud-native platforms, event-driven systems, and AI-powered applications for leading companies in the banking, mortgage, and fintech sectors.

Role Description

As a Senior Full Stack Engineer, you’ll be part of a high-impact product team building scalable, event-driven, cloud-hosted systems. You’ll design APIs, develop services, and ship clean, maintainable code across the stack (Node.js, TypeScript, GraphQL, React/Next.js).

You’ll collaborate directly with engineering leads from Sapphire Labs, LoanLight, and Aidium—helping shape architecture decisions, improve developer velocity through AI tooling, and deliver production-ready features quickly.

What You’ll Work On

• Architect and implement scalable backend APIs in Node.js/TypeScript (NestJS or Express)
• Build modern front-end interfaces using React / Next.js
• Design and maintain MongoDB or PostgreSQL schemas
• Integrate GraphQL APIs and REST endpoints for complex data models
• Work with AWS Lambda, EventBridge, S3, or equivalent event-driven systems
• Use AI-assisted tools (Cursor, Windsurf, Claude, Copilot) to accelerate development
• Participate in design discussions, code reviews, and sprint planning
• Contribute to DevOps pipelines, CI/CD automation, and cloud deployments

Responsibilities

• Translate business requirements into technical specifications and deliverables
• Write clean, testable, and maintainable code in TypeScript
• Integrate third-party APIs and internal microservices
• Collaborate with product, design, and QA to deliver features end-to-end
• Mentor junior engineers and contribute to shared architecture patterns
• Monitor performance and reliability in production environments
• Communicate clearly and proactively across distributed teams

Qualifications

• 7+ years of professional full-stack development experience
• Strong proficiency in Node.js, TypeScript, and React/Next.js
• Experience with NestJS or Express and GraphQL APIs
• Solid knowledge of MongoDB and/or PostgreSQL
• Familiarity with AWS, Lambda, S3, and EventBridge (or equivalent)
• Experience working with AI coding tools (Copilot, Claude, Cursor, etc.)
• Comfortable in high-velocity environments with minimal supervision
• Excellent written and verbal English communication
• Bachelor’s degree in Computer Science, Engineering, or equivalent experience

Bonus Points

• Experience with Kafka or event streaming
• Familiarity with RAG (Retrieval-Augmented Generation) and AI integrations
• Knowledge of CI/CD pipelines (Bitbucket, GitHub Actions, etc.)
• Prior experience working in fintech, banking, or mortgage technology
• Understanding of SOC2 and data security best practices

Interview Note

You’ll complete a live programming challenge—feel free to use your preferred AI tools (Copilot, Cursor, Claude Code, Windsurf, etc.). Have them ready!