Diego Sandoval · Senior Software Engineer

Architecture forsystems that scale.

focusDistributed Systems

Seven+ years designing and shipping backend and full-stack systems for fintech and B2B platforms — from payment-card infrastructure to AI-driven data products.

See my work

Get in touch

Hermosillo, Sonora, MéxicoGMT-7 · MSTGitHub ↗

About

Systems first, pixels close behind.

I'm a software engineer from Sonora, México, with more than seven years building scalable backend and full-stack systems for fintech and B2B platforms. My work spans payment-card infrastructure, high-volume data processing and, most recently, production AI systems built on LLM APIs.

Today I'm a Senior Software Developer at Bay Property Management Group, in charge of the end-to-end architecture of a multiplatform service — defining how web, mobile and backend systems fit together. Before that I rejoined Black Mamba Corp to lead AI integration for its main client, King Tide Solutions, and earlier built DeFi card infrastructure at Paystand.

I care about systems that stay simple under load: clear service boundaries, tested code, and pipelines that ship every day.

7+

Years of experience

5

Companies & clients — MX · US

3

Domains — fintech · B2B · AI

Education

B.Eng. in Computer Systems Engineering

Puerto Peñasco Institute of Technology (ITSPP)

Location

Hermosillo, Sonora, México

GMT-7 · MST

Experience

Seven years, five teams, three domains.

Bay Property Management Group
NowRemote · Baltimore, MarylandJun 2026 — Present
Senior Software Developer
In charge of the whole architecture of the company's multiplatform service.
- Own the end-to-end architecture of a multiplatform service spanning web, mobile and backend systems.
- Define service boundaries, data flows and the technical roadmap across every platform.
- Lead the design and implementation of core services and cross-platform integrations.
System ArchitectureMultiplatformBackendTechnical Leadership
Black Mamba Corp
Remote · Full-timeNov 2024 — Jun 2026
Team Lead & AI IntegrationApr 2025 — Jun 2026
Senior Software DeveloperNov 2024 — Apr 2025
Returned to Black Mamba full-time — leading engineering and AI-integration initiatives for its main client, King Tide Solutions: large-scale B2B platforms for trade management and marketing analytics.
- Architected scalable Go backend systems for high-volume data processing and transactional workloads.
- Integrated LLM APIs into internal and client-facing platforms: natural-language querying, automated reporting and insight generation.
- Designed data pipelines preparing multi-million-record marketing datasets for AI-driven analysis.
- Mentored engineers and set engineering standards across backend, data and AI-enabled services.
- Implemented CI/CD pipelines and agile workflows to improve delivery speed and reliability.
GoLLM APIsData PipelinesTeam Leadership
Paystand
Scotts Valley, CaliforniaApr 2022 — Apr 2025
Technology ConsultantNov 2024 — Apr 2025
Full-Stack DeveloperApr 2022 — Nov 2024
Built fintech platforms including the Paystand DeFi Card — physical and virtual payment-card infrastructure — then advised on VISA Virtual Cards and digital banking integrations.
- Developed APIs and backend services in Node.js with MySQL, and frontend features in React for financial workflows.
- Supported KYC, AML and PCI DSS compliance requirements for virtual card platforms.
- Guided bank-login integrations using MX Universal Widgets (UCP and UCW).
- Shipped containerized environments with Docker and adopted TDD across the stack.
- Integrated Solidfi, Sophtron, HubSpot and Google Analytics.
Node.jsReactMySQLFintechCompliance
Black Mamba Corp
Rocky Point, México · Part-timeJul 2019 — Aug 2022
Full-Stack Developer
Software solutions for international hotel corporations using the MERN stack and Go.
- Built backend APIs with Node.js and Go (Gin, Echo).
- Implemented CI/CD pipelines and TDD practices.
- Managed MongoDB databases and optimized application performance.
GoNode.jsMongoDB
Koji · withkoji.com
Remote · San Diego, CaliforniaJan 2019 — Apr 2022
Full-Stack Developer
Custom web platforms across logistics, event management and internal business tools.
- Developed full-stack applications on the MERN stack and integrated third-party APIs.
- Improved performance and scalability through backend optimization.
- Implemented unit, integration and end-to-end testing strategies.
MERNIntegrationsTesting

Selected Work

Systems I've shaped.

Bay Property Management Group

Multiplatform Property Service

End-to-end architecture for a service spanning web, mobile and backend — service boundaries, data flows and shared infrastructure designed from the ground up.

Architecture
Web
Mobile
Backend

King Tide Solutions · via Black Mamba

AI-Driven Marketing Analytics

LLM-powered natural-language querying, automated reporting and insight generation over multi-million-record marketing datasets.

Go
LLM APIs
Data Pipelines

Paystand

Paystand DeFi Card

Physical and virtual payment-card infrastructure: banking APIs, compliance-aware flows (KYC · AML · PCI DSS) and bank-login integrations.

Node.js
MySQL
React

Skills

The toolbox.

Go (Golang)JavaScript (ES6+)TypeScriptNode.jsExpress.jsREST APIsMicroservicesDistributed SystemsReact.jsNext.jsHTML5CSS3MySQLMongoDBLLM API IntegrationAI Workflow AutomationData Processing PipelinesPrompt EngineeringData AnalysisDockerCI/CDGit · GitFlowLinuxTDDAgile · ScrumCode ReviewSystem DesignSystem ArchitectureTeam LeadershipTechnical MentorshipCross-functional CollaborationProject Coordination

Project CoordinationCross-functional CollaborationTechnical MentorshipTeam LeadershipSystem ArchitectureSystem DesignCode ReviewAgile · ScrumTDDLinuxGit · GitFlowCI/CDDockerData AnalysisPrompt EngineeringData Processing PipelinesAI Workflow AutomationLLM API IntegrationMongoDBMySQLCSS3HTML5Next.jsReact.jsDistributed SystemsMicroservicesREST APIsExpress.jsNode.jsTypeScriptJavaScript (ES6+)Go (Golang)

Languages

Go (Golang)
JavaScript (ES6+)
TypeScript

Backend

Node.js
Express.js
REST APIs
Microservices
Distributed Systems

Frontend

React.js
Next.js
HTML5
CSS3

Databases

MySQL
MongoDB

AI & Data

LLM API Integration
AI Workflow Automation
Data Processing Pipelines
Prompt Engineering
Data Analysis

DevOps

Docker
CI/CD
Git · GitFlow
Linux

Practices

TDD
Agile · Scrum
Code Review
System Design
System Architecture

Leadership

Team Leadership
Technical Mentorship
Cross-functional Collaboration
Project Coordination

Contact — open to interesting problems

Let's build something that scales.

I'm always open to talking about systems architecture, fintech, AI integration — or an interesting problem you think I should hear about.

diegosandovalr.corp@gmail.com

GitHub LinkedIn

Hermosillo, Sonora, MéxicoGMT-7 · MST