Backend & full stack
I design and ship APIs and product surfaces with PHP, Laravel, Node.js, React, TypeScript, and Python — emphasizing clear contracts, dependable data layers, and maintainable delivery.
Hello, I amEMILIO MOLINA.
Principal Software Engineer building scalable SaaS, enterprise, and AI-enabled platforms.
With 16+ years of experience, I help companies turn complex business workflows into reliable software products — from legacy modernization and backend APIs to cloud-native systems, AI assistants, and LLM-powered experiences.
Full-stack engineering
SaaS, enterprise, and AI-enabled systems.
16+
Years building software.
I am a Principal Software Engineer with 16+ years of experience designing, building, and modernizing full-stack platforms for SaaS, enterprise, and product-driven environments. My work connects backend APIs, frontend experiences, databases, cloud infrastructure, and business workflows into reliable systems that teams can operate and evolve.
Across companies such as Solera, Mailchimp/Intuit, startups, and independent product work, I have worked on legacy modernization, growth experimentation, reporting systems, invoicing-related workflows, AI-enabled applications, and RAG-based assistants. I stay close to the code while also helping teams make better architecture decisions, improve engineering standards, and mentor other developers.
SaaS & enterprise
I build platforms for product and operations teams: business workflows, reporting, integrations, and systems that need to scale with real-world usage.
Cloud & modernization
I modernize legacy systems toward cloud-native architectures with Docker and AWS, PostgreSQL and MySQL, improving performance, observability, and long-term evolution.
AI / LLM & leadership
I deliver assistants, automation, and LLM/RAG experiences (FastAPI, Python) while staying hands-on in the codebase and supporting architecture decisions, standards, and mentoring.
Core strengths
- Backend APIs & full-stack delivery
- SaaS and enterprise platform modernization
- AI/LLM systems, RAG, and automation
- Cloud-native architecture and technical leadership
Career
From hands-on delivery to principal-level engineering.
Select a year to explore roles, technical impact, and how product delivery evolved over time.
16+
Years in software.
January 2025 - Present
Principal Software Engineer - Tensure (Mailchimp / Intuit)
Growth engineering and experimentation
Contributed to experiment-driven product development in a high-scale SaaS environment: notifications, messaging flows, user segmentation, and measurable outcomes.
Connected technical implementation with product hypotheses, user behavior, and business goals using Node.js, React, PHP, and PostgreSQL.
Cross-functional SaaS delivery
Partnered with engineering, product, and design to turn specifications into reliable implementations on platform.
Bridged product strategy, technical capabilities, and measurable outcomes with principal-level ownership and hands-on execution in code and design review.
Experience
Areas of impact I bring to teams.
16+
Years of experience
Staff / Principal engineering
SaaS & enterprise platforms
Legacy modernization, full-stack SaaS architecture, and backend APIs for complex workflows — reporting, financial data, invoicing, and multi-market operations (e.g. Solera). I combine hands-on delivery with PHP, Laravel, Node.js, React, and PostgreSQL alongside mentoring, production debugging, and architecture judgment as a Staff / Principal Software Engineer.
Growth & full stack
Growth engineering & product
High-scale SaaS delivery (Mailchimp / Intuit): growth experiments, notifications, segmentation, and measurable product outcomes. I connect backend APIs, data, and frontend experiences to product hypotheses, user behavior, and business goals — with credible full-stack execution, not slide-deck engineering.
AI / LLM & cloud
AI, cloud-native & leadership
AI product engineering: RAG systems and assistants with FastAPI, Python, Docker, AWS, and PostgreSQL (pgvector). I also deliver platform rebuilds, automation, and independent Molinart work — websites, applications, and AI-enabled solutions with technical leadership, clear documentation, and team standards.
Technologies
Stack for SaaS, enterprise, and AI.
Technologies I use to design, build, modernize, and scale full-stack, SaaS, enterprise, and AI-enabled platforms.
6
Engineering focus areas
Core backend
APIs and services that carry the product: clear contracts, business logic, integrations, and maintainable delivery in SaaS and enterprise environments.
- PHP
- Laravel
- Node.js
- Python
- FastAPI
- Flask
- REST APIs
- Microservices
Frontend
Product interfaces aligned with backend and data — from SPAs and SSR to reusable components and complex user workflows.
- React
- Next.js
- TypeScript
- JavaScript
- Angular
- Vue.js
- HTML5
- CSS3
Databases
Modeling, queries, and optimization for reporting, transactions, and production workloads — including vector search for RAG systems.
- PostgreSQL
- MySQL
- MariaDB
- MongoDB
- SQL optimization
- pgvector
Cloud & DevOps
Containers, pipelines, and observability to ship software with repeatability, operational safety, and pragmatic scaling.
- AWS
- Docker
- ECS Fargate
- ECR
- CloudWatch
- GitHub Actions
- GCP
- CI/CD
AI / LLM engineering
LLM assistants and flows grounded in real data: retrieval, evaluation, and production APIs — not disconnected chatbot demos.
- OpenAI APIs
- Embeddings
- RAG systems
- Vector search
- Prompt engineering
- AI assistants
- Evaluation & grounding
Architecture & leadership
How I work with teams and the business: modernize without breaking operations, design for evolution, and raise engineering standards.
- Legacy modernization
- SaaS architecture
- Technical mentoring
- System design
- Product collaboration
- Engineering standards
Ask Emilio AI
Explore my background before you reach out.
Use this assistant to explore my experience, technical leadership, projects, architecture decisions, AI work, and why I could be a strong fit for your engineering team.
The assistant is grounded in my public professional context and is designed to answer questions about my background, skills, and work experience. It does not have access to private data and cannot confirm availability, rates, or contract terms.
Molinart Assistant
Answers grounded in Emilio’s published professional profile
Contact
Interested in working together?
I’m open to selected opportunities in Staff or Principal Software Engineering, AI-enabled product development, SaaS architecture, and technical leadership. Reach out about roles, consulting, collaborations, or product work.