01
Web Development
Production-grade websites and web apps: clear architecture, accessible interfaces, and a deployment path a team can actually own.
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Independent practice · San José, Costa Rica
// systems engineer
Connecting data, learning and digital innovation.
I am a systems engineer who turns ideas into modern, efficient and scalable software. I work across web products, data, education and operations — always with the same aim: technology that creates real value.
10+
Years of practice
4
Shipped products
2
Countries of work
6
Practice areas
yerlin@sanjose ~ mainUTF-8 · Next.js · San José, Costa RicaOpen to national and international collaboration
// practice areas
Six ways of working, one standard of care.
02
Data Analytics
Turn operational data into decisions: definitions, methods, visualisations and reports that a non-specialist can actually use.
Read More03
Cybersecurity
Security as a design constraint: least privilege, careful data handling, and public surfaces that do not leak private records.
Read More04
Cloud Solutions
Hosting, environments and preview workflows so production does not depend on a single laptop.
Read More05
UI & UX Design
Interfaces designed from the content outward: type, hierarchy, a small palette, and interaction that respects the thumb.
Read More06
Digital Solutions
The smallest software that removes the most friction: processes first, frameworks later.
Read More
// about
Data, education and technology
I am a systems engineer with a professional background that spans data analysis, education and digital product development. I combine analytical thinking, teaching experience and modern web engineering to turn information into decisions — and ideas into products people can actually use.
A practice built on two countries and one question: what should this system actually do?
From classrooms in Nicaragua to operations in Costa Rican real estate, my work has always sat at the intersection of people, process and software. That mix is now the core of how I design digital products.
// next
Build software that outlasts the brief.
The next decade of my work is focused on three fronts: resilient web products, applied intelligence, and digital transformation that respects the people who have to live with the system. I want to collaborate with teams — in Costa Rica and abroad — who care about craft, security and measurable outcomes.
Discuss a project// selected work
Turning complexity into useful digital products.
Travel & hospitality2026 · getaway-costa-rica
GetAway Costa Rica
A local travel studio in La Fortuna that plans hidden itineraries, waterfalls and coast-to-coast days — without the tourist-trap script.
View project
Healthcare2026 · policlinica-maria-inmaculada
Policlínica María Inmaculada
A civic-scale clinic site for Rivas: appointments, laboratory, pharmacy and a directory of specialists — designed for families, not for dashboards.
View project
Hospitality2026 · restaurante-mi-pueblo
Restaurante Mi Pueblo
A house restaurant in Belén, Rivas: the good table, the best company, and a reservation path that feels like being invited.
View project
Civic / public sector2026 · alcaldia-de-belen
Alcaldía de Belén
A municipal portal for Belén, Rivas — services, civil registry, taxes, cadastre and citizen voice — designed to feel closer, not bureaucratic.
View project// method
Listen. Frame. Build. Refine.
01
Listen
Understand the operation, the people and the constraint before proposing a stack.
02
Frame
Turn the problem into a clear scope: users, flows, risks and a realistic path to launch.
03
Build
Design and implement with modern web technologies, security in mind and a maintainable architecture.
04
Refine
Measure, teach the team and keep improving after launch. Software is a relationship, not a delivery.
// references
How people describe the work.
When Yerlin led statistics at the school, the reports finally answered the questions we actually asked in the Monday meeting. He would not publish a chart he could not defend.
María Elena Vargas
Academic coordinator, secondary education
In the warehouse and later in costs, he treated numbers as a system: reception, rotation, invoices, the budget. If a figure did not reconcile, he stayed until it did.
Carlos Méndez
Operations, real estate
He taught adults as if the software had to survive the class. No theatre, no leftover slides. People left able to open the tool on Monday.
Ana Lucía Herrera
Training coordinator, technical education
// engagements
Flexible solutions for every digital challenge.
Discovery
Conversation
For a first idea, a stuck process, or a site that no longer represents the work.
- — 45–60 minute working conversation
- — Written reading of the problem
- — Recommended scope and risks
- — In English or Spanish
Most requested
Product build
Custom scope
The core engagement: a complete digital product, from information architecture to a maintainable launch.
- — Discovery, information architecture and interface
- — Engineering with React and modern tooling
- — Content, accessibility and performance
- — Deployment, documentation and training
- — Security review in the architecture
Advisory
Retainer
Ongoing counsel for teams who already have a product and need a sharper technical and operational eye.
- — Monthly working sessions
- — Architecture and process review
- — Prioritisation and KPI design
- — Enablement for the people who run it
// notes
Insights on data, education and technology.
12 Mar 2026
Data
The role of data in better decision making
Numbers do not decide. People do — if the evidence is honest, visual and close to the operation.
Read More02 Feb 2026
Education
Connecting education with technology
Equipment is not a strategy. Teaching people to use it — and designing software they can live with — is.
Read More18 Jan 2026
Innovation
Technology as a tool for digital innovation
Innovation is not a new library. It is a better answer to an old operational pain.
Read Moreopen a brief
If the operation is stuck, write.
If you are building a product, modernizing an operation or exploring a digital idea, I would like to hear about it.