W3Global
Sr Ruby on Rails Engineer
Skills
2 months ago
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Important information
Contract type:
Freelance / Contract
Location:
Mexico City, CDMX, Mexico
Work mode:
Onsite
Published on:
12 August 2026
What they need
Job Title: Sr Ruby on Rails Engineer Locations: Mexico- Remote Skill Set: Ruby on Rails, PostgreSQL, sidekiq, RESTful APIs, HTML/CSS Minimum Experience: Above 4+ Years Job Description About the Role We're looking for a Ruby on Rails engineer to own the migration of our system integration from V1 directly to V3. This is a mandated upgrade that transitions our integration from a synchronous, batch-polling model to a fully asynchronous architecture using Individual Callback Notifications. You'll implement both the legacy V2 data-contract changes (which we're skipping as a standalone release) and the new V3 async framework.
What You'll Do
- API Migration & Data Contract Retrofitting - Implement V2 data-gap changes including mandatory country codes, SSN→national Id field renaming across all PII endpoints, culture code enforcement, input regex sanitation, and optional external reference ID mapping.
- Asynchronous Architecture - Build the V3 Long Running Search Support framework with individual report webhook callbacks and landlord attestation integration.
- UI/UX & Compliance - Develop an async dashboard, disclaimer modals for Identity/Income reports, renter-visibility restrictions, and HTML doctype rendering.
- Cutover Execution - Participate in staging validation, Deploy Night execution, and Register API + Notifications migration.
What We're Looking For
Required
- 4+ years of professional experience with Ruby on Rails
- Strong experience building and consuming RESTful APIs and working with third-party API integrations (especially financial or identity services)
- Solid understanding of asynchronous architectures - webhooks, callbacks, event-driven patterns
- Experience with server-to-server authentication (OAuth, token-based auth, MFA/multi-key rotation)
- Working knowledge of TLS/HTTPS, IP whitelisting, and secure data handling for PII
- Familiarity with data migration strategies - versioned API contracts, backwards compatibility, and cutover planning
- Comfort working with relational databases (PostgreSQL or MySQL) and writing performant queries
Preferred
- Experience with credit bureau, or financial services APIs (TransUnion, Experian, etc.)
- Background in property management / PropTech platforms
- Exposure to webhook endpoint design and idempotent event processing
- Experience with staging/production deployment workflows and zero-downtime migrations
- Familiarity with compliance requirements around consumer credit data (FCRA, data privacy)
Tech Stack
- Ruby on Rails
- RESTful / Webhook-based APIs
- PostgreSQL
- Background job processing (Sidekiq or similar)
- TLS 1.2 / Token-based authentication
- HTML/CSS (for compliance UI modals and dashboard rendering)
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