Hi, I'm
Germán Sandoval
Senior Full Stack Engineer
Building and scaling fintech, travel, and marketplace platforms for 9+ years — backend to frontend.
01
About Me
I'm a senior full-stack engineer with 9+ years designing and scaling fintech, travel, and marketplace platforms. I work end to end — distributed systems, event-driven architecture, API and SDK design, and frontend architecture — and enjoy owning a product from system design through delivery.
I also lead through mentorship, architecture reviews, and technical RFCs. When I'm not shipping code, I'm learning languages, reading, taking photos, following F1, or building side projects like Ridecito.
Location
Mérida, Mexico
Status
Open to international opportunities & relocation abroad
9+Years of
experience
10+Projects
delivered
Languages
SpanishNative
EnglishC1
GermanA2
JapaneseN5
02
Experience
Founder & Lead Engineer
Ridecito
Jan 2026 – PresentMérida, Mexico · Side project
- Architected a full-stack B2B carpooling platform MVP with React, TanStack Router, and Supabase, including infrastructure for ESG Scope 3 CO₂ savings tracking.
- Designed a flattened PostgreSQL schema to consolidate trip-routing data, applying the YAGNI principle to keep queries fast and the backend simple.
- Built serverless backend logic with Supabase Deno Edge Functions and integrated Resend for transactional notifications, with GDPR and LFPDPPP compliance.
Senior Software Engineer
Paymitto
Aug 2024 – PresentMérida, Mexico (Remote)
- Led the architecture and development of a greenfield international payments Web SDK and integration layer within an 8-person team, supporting 1M+ annual transactions across 15+ currencies.
- Designed the SDK architecture and defined API communication contracts with core backend teams, standardizing the integration layer across 12+ host applications.
- Engineered a webhook extension bridging the frontend SDK with the Q2 digital banking platform, mapping complex execution flows to unlock scalable integrations with new banking partners.
- Managed the SDK cloud infrastructure on Azure (App Service, Key Vault, Application Insights), ensuring secure deployment, fault tolerance, and monitoring of the integration layer.
- Established platform engineering standards adopted by 12+ engineers and accelerated engineering velocity by 60% through AI-assisted Spec-Driven Development and architecture reviews.
Senior Software Engineer
Wizeline (Synchrony Financial)
Sep 2022 – Aug 2024Guadalajara, Mexico (Remote)
- Led full-stack architecture and performance initiatives for a high-traffic financial marketplace within a 6-person team, resolving bottlenecks across frontend rendering, GraphQL queries, and application infrastructure.
- Redesigned the data-delivery architecture, improving page load times by 45%, raising Lighthouse scores from 60 to 90, and driving a sustained 15% increase in organic traffic via SEO.
- Developed complex reporting screens and analytics-driven financial data tables that helped users evaluate financial products more effectively.
Full Stack Engineer
Clip
Jul 2020 – Sep 2022Guadalajara, Mexico (Remote)
- Designed and implemented event-driven microservices and fault-tolerant messaging pipelines using AWS Lambda, SNS, and RabbitMQ to reliably process 200K+ daily payment transactions.
- Engineered scalable distributed backend services for a customer base of 500K+ users, collaborating with a 6-person platform squad on dead-letter queues and infrastructure observability.
- Drove backend architectural initiatives that improved the long-term scalability, data consistency, and operational resilience of critical payment-processing systems using PostgreSQL and DynamoDB.
Software Engineer
Luxoft (Expedia Group)
Aug 2019 – Jun 2020Guadalajara, Mexico
- Designed and implemented reusable platform components and shared architecture patterns across a 6-person team, adopted by multiple applications and engineering units.
- Built frontend and backend solutions that accelerated feature delivery by 40% through improved code reuse, while contributing to analytics initiatives to increase customer conversions.
Application Developer
IBM
May 2017 – Feb 2019Guadalajara, Mexico
- Migrated 80+ legacy Handlebars views into modern React applications, improving maintainability and reducing Time to Interactive by 55%.
- Built operational interfaces and optimized backend data systems, cutting critical database query times from 3 minutes to 30 seconds through targeted NoSQL/DynamoDB indexing strategies.
03
Skills
Frontend
ReactNext.jsTypeScriptJavaScriptZustandReduxTanStack RouterTailwindFramer MotionHTML5 / CSS3
Backend & APIs
Node.jsExpressPythonREST APIsGraphQLtRPCDeno Edge FunctionsEvent-Driven SystemsWebhooks
Databases & Messaging
PostgreSQLDynamoDBRabbitMQSupabaseSQL Optimization
Cloud & Infrastructure
AzureAWS (SQS, SNS, EC2, S3)VercelDockerCI/CDTurborepoGit
Architecture & Leadership
System DesignDistributed SystemsMicroservicesSDK DevelopmentTechnical MentorshipArchitecture ReviewsAI-Assisted SDD
04
Projects
Ridecito
FeaturedA B2B carpooling platform that helps companies cut commuting emissions, with ESG Scope 3 CO₂ savings tracking. Full-stack MVP: React + TanStack Router frontend, Supabase Postgres with a deliberately flattened schema, and Deno Edge Functions for serverless backend logic and transactional email.
ReactTanStack RouterSupabasePostgreSQLDeno Edge FunctionsZustand
me
My personal portfolio and blog. Built with Next.js App Router, next-intl for multilingual support (EN/ES), Tailwind CSS v4, and framer-motion animations. Features dark mode, MDX blog, dynamic OG images, and RSS feed.
Next.jsTypeScriptTailwind CSSnext-intlMDX
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Contact
Have a project in mind or just want to chat? I'd love to hear from you.
You can also reach me at german.sandoval.ie@gmail.com