Senior Fullstack Engineer

This is a fully remote position, open to applicants in United States.

📋 Description

• Design, develop, and sustain features across Rails API services, TypeScript/Node services, a GraphQL gateway, and React frontends.

• Take ownership of integrations with external platforms, encompassing data mapping, synchronization, reconciliation, retries, and idempotency.

• Create and enhance asynchronous, multi-step workflows utilizing RabbitMQ, SNS/SQS, Sidekiq, and saga-style orchestration.

• Ensure the correctness and security of the multi-tenant platform.

• Lead technical design initiatives through design documents and architecture decision records.

• Identify and mitigate technical debt while enhancing service boundaries, module design, test coverage, and developer experience.

• Conduct code reviews and contribute to the establishment of engineering standards.

• Engage in on-call rotation, spearhead incident response, and implement root-cause fixes.

• Utilize and enhance observability tools and CI/CD processes.

• Collaborate with Customer Support & Success on lender-reported escalations and external LOS synchronization challenges.

• Work closely with Product Managers to refine requirements and pinpoint edge cases.

• Partner with UI/UX Designers to deliver refined, accessible interfaces.

• Mentor engineers through pairing, code reviews, and design feedback.

• Lead AI-assisted engineering efforts utilizing Claude Code, Cursor, and Codex.

• Develop and maintain shared AI tools, including agent instruction files, reusable skills and prompts, MCP servers, and automated workflows.

• Set up AI-use guardrails and validate agent outputs.

⛳️ Requirements

• 7+ years of experience in building and operating production web applications.

• Extensive experience with Ruby on Rails, including API-only services, ActiveRecord, PostgreSQL, background jobs, and RSpec.

• Proficient in delivering UI with React and TypeScript.

• Familiarity with GraphQL; Apollo is preferable.

• Experience in constructing distributed, event-driven systems.

• Understanding of retries, idempotency, and eventual consistency.

• Knowledge of third-party integrations and partner APIs, including REST, SOAP, and webhooks.

• Strong instincts for security and multi-tenant data isolation.

• Regular use of AI and agentic coding tools at an advanced level.

• Capability to structure context for agents and verify their outputs.

• Proficient in writing design documents and articulating production incidents clearly.

• Responsible for on-call duties, incident response, observability, and conducting blameless postmortems.

• Bonus: experience in mortgage technology or heavily regulated, integration-focused domains.

• Bonus: familiarity with LOS platforms (Encompass, MortgageBot, Byte) or MISMO standards.

• Bonus: experience with Node.js/TypeScript services, Elasticsearch, Redis, Docker, AWS, CI/CD, and saga or workflow orchestration patterns.

• Bonus: experience in mentoring engineers and leading cross-team projects.

🏝️ Benefits

• PTO as needed.

• Comprehensive insurance coverage.

• 401(k) matching.

• Stock option grants.

• Stock purchase plan.

• Flexibility to work from your preferred location: at home, in an office, or on the go.