Ex-Disney · Ex-Globant · Freelance since 2014
Freelance software developer for Mexico — USA-overlap timezone, SAT-aware, Spanish native.
I build software for Mexican startups and companies with timezone that overlaps both LATAM and the US business day, native Spanish, and experience with the SAT CFDI 4.0 regime, Conekta/OpenPay/Mercado Pago checkouts, and the nearshoring wave reshaping Mexican tech.
Start a projectTimezone bridges LATAM and the US business day
Mexico operates mostly in UTC-6 (CDMX), which gives us a 3-hour window in my morning and 3 hours in their afternoon. If your business also deals with US clients, this overlap pattern is the most productive in Latin America — full morning with US East Coast, full afternoon with the rest of LATAM.
SAT CFDI 4.0 integrations that pass validation
SAT is not optional. CFDI 4.0 requires specific structure — RFC sender/receiver, CodigoPostal, UsoCFDI, FormaPago, MetodoPago — and rejection is frequent for invalid fields. I've built integrations using PAC providers like Facturama, SW Sapien and Solución Factible that validate and timbran invoices at scale.
The Mexican payment ecosystem is its own beast
Conekta for domestic credit card checkout, Mercado Pago regionally, OpenPay for multi-method (including OXXO cash), Kueski Pay for BNPL, and CoDi for bank-to-bank QR transfers. Each has its shape and I've shipped the ones that match the merchant's profile.
Nearshoring context familiar
Mexican nearshoring for US companies is the fastest-growing segment of the market — Kavak, Kueski, Konfio, Clip, Clara raised the bar for quality. I know the expectations: English-proficient team for US stakeholder calls, bilingual documentation, shipping velocity that matches SF standards. Not "Mexican-quality" — world-class.
What I work with for Mexican projects
- Next.jsWebsites and dashboards with native SEO support
- NestJSProduction backends for SaaS, CRMs, booking systems
- React NativeCross-platform mobile apps for App Store and Google Play
- SAT CFDI 4.0Emission, timbrado via PAC, cancelación, CFDI reception
- ConektaDomestic card checkout with OXXO and bank transfer support
- Mercado PagoRegional checkout and subscriptions
- OpenPayMulti-method with cash, card, SPEI, PayPal
- CoDiBank QR transfers under UPI-like national scheme
- WhatsApp BusinessCustomer comms on the channel Mexicans actually read
- StripeFor clients billing USD or MXN internationally
- Spanish (native)Every conversation, contract and doc in your language
- USA-overlap timezone3h overlap with US East Coast + full LATAM
Why Mexican companies hire cross-border senior engineers
Mexico's tech market exploded in the last 5 years. The nearshoring thesis brought American companies to Mexican engineering teams, and the local startup scene (Kavak, Bitso, Konfio, Clip, Clara, Kueski) matured from Y Combinator graduates into serious unicorns. The result: senior engineers in CDMX and Monterrey are expensive, booked, and often employed by US companies at USD rates.
Hiring cross-border from Argentina makes sense for Mexican companies facing that tight market, especially for scoped engagements that don't justify a full-time hire. Same language at native level, plus timezone overlap generous enough for real-time collaboration during Mexican business hours. Rate structure comparable to senior local Mexican rates — not the global-USD floor, sensible economics for the project size.
Where this fits best: Mexican SaaS and fintech scaling to LATAM or US, e-commerce merchants that need custom Conekta/OpenPay integration beyond Shopify, companies dealing with SAT CFDI 4.0 integration complexity, and nearshoring-adjacent projects where the Mexican company needs an extra senior engineer for a 3-6 month feature sprint.
Billing: international services, reverse-charge treatment on the Mexican side (your contador handles this — it's standard for any company working with foreign contractors). Payment in USD via Wise or bank transfer, or MXN at the diario exchange rate if preferred. Contract pegged to USD, which is the standard for Mexican companies dealing with international contractors and protects both sides from peso fluctuations. Nothing exotic here — most Mexican mid-market companies already have the plumbing for this.
FAQs
Como servicios prestados desde el exterior. Desde el lado mexicano, normalmente pasa por contabilidad bajo reglas de importación de servicios. Sin CFDI emitido por mí; tu contador maneja la RETENCIÓN/acreditación según régimen de tu empresa (SA, SAPI, PFAE). Es estándar para quienes trabajan con contractors internacionales.
Sí — he trabajado con emisión vía PACs (Facturama, SW Sapien, Solución Factible), complementos específicos (pagos, nómina, recepción de pago), validación de RFC, cancelación, y el flujo de timbrado. CFDI 4.0 es estricto con campos como UsoCFDI y FormaPago; conozco los errores comunes.
Depende del perfil. Conekta para e-commerce B2C que prioriza UX y OXXO cash. OpenPay para multi-método incluyendo SPEI y PayPal. Mercado Pago para integración regional con otros países LATAM. Stripe México si ya usás el ecosistema Stripe globalmente. Kueski Pay para BNPL.
Argentina es UTC-3, CDMX UTC-6 (sin DST desde 2022). Diferencia estable de 3 horas. Cuando arranca tu día (9 AM CDMX = 12 PM Argentina), yo ya estoy en medio mañana. Solapamos cómodo desde 12 PM CDMX hasta 3 PM CDMX con tiempo full productivo. Llamadas de la tarde (CDMX) son matutinas para mí.
Sí cuando el proyecto lo justifica. Buenos Aires-CDMX es vuelo directo de 9 horas — factible para kickoffs o trimestres de proyectos largos, no para reuniones semanales. Para contacto continuo, video. Los costos de viaje se acuerdan aparte.
SaaS B2B escalando a US/LATAM, fintech con integración SAT compleja, e-commerce con Conekta/OpenPay, tooling interno para empresas medianas, nearshoring puntual de features para empresas mexicanas atendiendo clientes US. Cómodo con agencias y directo con founders.
Looking for a senior freelance engineer for Mexico?
USA-overlap timezone, SAT CFDI 4.0 experience, Conekta/OpenPay, native Spanish. Reply within 24 hours.
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