Arnold Esquivel
I turn business problems into software that works.
I'm Arnold Esquivel, a self-taught full-stack engineer and founder of Ekatech. I'm passionate about building custom platforms that don't just look good, but solve real market problems: from a fast MVP to validate an idea, to robust systems ready to scale.
Day to day, I integrate Artificial Intelligence tools to speed up development times and polish the code to the max, which lets me focus on what truly matters: the security, your product's architecture, and the value it brings to your business. Got a project in mind? Let's make it happen.
CDMX · Remote available · ES · EN
What I do
Product Engineering
I turn ideas and business problems into functional, secure, and scalable digital products with verifiable criteria.
Architecture & Technical leadership
I design systems with Clean Architecture, SOLID and recorded decisions that any engineer on the team can maintain.
UX + Engineering integrated
Task-oriented flows, actionable errors, and verifiable UX quality from the first sprint.
Signature Strengths
Technical clarity from day 1
I define standards, acceptance criteria and quality gates before writing code. Not as a patch at the end.
Security by design
OWASP baseline, correct secret management, granular roles and minimal exposure. Integrated hardening, not added on.
Code others can maintain
Coherent architecture, documented ADRs, and minimum viable documentation. No single-person dependency.
My personal specification method
A process to align business and engineering before writing a single line of code.
Context & Goals
Stakeholder mapping, success metrics, and technical & business constraints.
Quality standards
Definition of quality gates: security, performance, UX and maintainability.
Technical specification
ADRs, API contracts, architecture diagrams and iterative release plan.
Acceptance criteria
Each feature has verifiable criteria (business + technical) before implementation begins.
Hardening & Validation
Security, UX, and performance review before each release. Signed quality gate.
- Prioritized initial backlog
- ADRs and technical decisions
- Acceptance criteria per epic
- Signed hardening checklist
- Iterative release plan
- Justified stack recommendation
- Technical risk map
Stack & Capabilities
Rendafin
Lead EngineerFintech platform for leasing, rent and credit management. Built with clean architecture, security by design, and deep focus on financial UX.
- Complete modular architecture design deployed on Azure
- Authentication system with JWT, refresh tokens and granular roles
- Financial calculation module with complex business rules
- Third-party API integration (SAT, credit bureau)
- Admin panel with real-time reports and dashboards
- Multi-channel notification system (email, SMS, calls)
- OWASP baseline and security audit before production
- CI/CD pipeline with GitHub Actions and Azure App Service deployment
- Technical documentation and operational runbook for the team
- 60% reduction in customer onboarding time
- System processing financial transactions in production
- Zero security incidents since launch
- Technical clarity from the start avoids costly refactors
- Financial UX requires exceptionally clear error flows
- Security hardening is integrated from design, not added at the end
Selected Work
Ekatech Landing
SPA with custom design system, CSS tokens, canvas animations and Server/Client architecture.
AI Agent Pipeline
Agent pipeline with LLMs for business process automation with human-in-the-loop review.
SaaS Backoffice
Operations management backoffice with roles, granular permissions and audit trail.
E-commerce Platform
E-commerce platform with cart, integrated payments and admin panel.
Data Pipeline
Data pipeline with automated transformation, validation and loading to Azure.
Leadership & Soft Skills
I lead with technical clarity and empathy. I communicate engineering decisions in business language and build a shared quality culture.
Certifications
Continuous training in software engineering, systems architecture and security. All verified certifications are available on my LinkedIn profile.
View certifications on LinkedIn