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Dayron Barrueco

I lead engineering teams. Fifteen years building payments, travel and data platforms.

Development IT Team Lead at Leadtech Group

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In a computer: The processor takes every instruction, decides the order and spreads the work across its cores.Here: Every day I take what the business needs, set the priorities and share the work across the team.

What I do

In a computer: Memory keeps at hand what the processor needs right now, without going back to the drive.Here: The six skills I use daily without having to look them up; a real case proves each one.

BANK A · DIMM_A1-A3

BANK B · DIMM_B1-B3

DIMM_A1 · DDR5 · 95% · Junior → StaffTEAM LEADERSHIP

Leading engineers from junior to staff since 2019. At Leadtech: 95% annual retention and 71% of the team moved up a level, with satisfaction measured through surveys and one-to-ones.

95% · Keeping a team together while it levels upJunior → Staff · A payment platform under Bank of Spain regulation

DIMM_B1 · DDR5 · +20% · s → ms · 57%SOFTWARE ARCHITECTURE

Secure payments under Bank of Spain regulation; queues, caches and web sockets; architecture migrations that came with sales up more than 20% a year; data architecture and query optimization, from seconds to milliseconds.

+20% · Migrating the architecture while sales grew 20% a years → ms · Accounting reports from seconds to milliseconds57% · A booking platform for travel agencies, 57% fasterJunior → Staff · A payment platform under Bank of Spain regulation

DIMM_A2 · DDR5 · 95% · v1 · s → msMENTORING AND STANDARDS

Code reviews turned into practice: patterns, architecture, SOLID. Mentoring juniors at Firedevs and Indevo, and head of the Data Architecture Role Committee at UCI, setting standards and training teams.

95% · Keeping a team together while it levels upv1 · The first stable admin panel of a travel platforms → ms · Accounting reports from seconds to milliseconds

DIMM_B2 · DDR5 · v1 · +15% · 57%FRONT AND BACK DEVELOPMENT

React, Next.js and Node.js end to end: interfaces that render only what they must (code splitting, lazy loading, memoization) and backends that answer fast, from admin panels to payment flows.

v1 · The first stable admin panel of a travel platform+15% · Device activation that lifted sales 15%57% · A booking platform for travel agencies, 57% faster

DIMM_A3 · DDR5 · 95%AI APPLIED TO THE TEAM

Bringing the advantages of AI models into the team’s daily work: automation of the team’s work, onboarding of new members, and training people to use the models well.

95% · Keeping a team together while it levels up

DIMM_B3 · DDR5 · 95% · v1QUALITY AND TESTING

Unit, integration and end-to-end suites, and test coverage of the main processes on the rise, so a team can change code without fear.

95% · Keeping a team together while it levels upv1 · The first stable admin panel of a travel platform

Selected work

In a computer: Drives keep finished work and hand it back intact whenever it is asked for.Here: Seven projects from 2009 to today: what I delivered and the figure it left behind.

M2_1 · 22110 · ACTIVE · SEPT 2023 – PRESENT95%ANNUAL RETENTION71%OF THE TEAM MOVED UP A LEVEL

Keeping a team together while it levels up

Leadtech Group · Development IT Team Lead

In a product company the expensive failure is churn: every departure takes context with it and sets the team’s seniority back.

  • Retention: 95% a year. Detailed surveys and regular one-to-ones, so problems surface while they can still be fixed.
  • Growth: 71% of the team moved up a seniority level, through systematic code reviews and a practice built on what they expose (recognized design patterns, sound architectures, SOLID principles).
  • A faster web platform: page speed, good practices and new technologies, adopted with cohesion and teamwork.
  • Onboarding of new members, automation of the team’s work with AI, and test coverage of the main processes on the rise.

Next.js · TypeScript · Prisma ORM · Node.js

M2_2 · 2280 · STORED · MAR 2019 – SEPT 2023Junior → StaffENGINEERS LED ON A REGULATED PAYMENT PLATFORM

A payment platform under Bank of Spain regulation

Tropipay · Senior Software Engineer, leading engineers from junior to staff

Payments in Spain are regulated by the Bank of Spain. The platform had to be secure and compliant while it kept adding products.

Leading engineers from junior to staff while building a secure payment platform that complies with Bank of Spain regulations, and that kept growing: marketplace, affiliates, POS, financial services.

Node.js · React · Redux · PostgreSQL · Redis · AWS · Socket.io · Jest · Cypress

M2_3 · 2280 · STORED · MAR 2019 – SEPT 2023+20%SALES GROWTH EVERY YEAR

Migrating the architecture while sales grew 20% a year

Tropipay · Senior Software Engineer

Performance bottlenecks and dependencies slowed both the product and the developers who built it.

Sales increased by more than 20% each year after the migration.

Node.js · Express · React · Redis · PostgreSQL · Sequelize · AWS

M2_4 · 2280 · STORED · FEB 2017 – APR 201857%SHORTER SERVER RESPONSE TIME

A booking platform for travel agencies, 57% faster

Travel agencies, United States clients · Full Stack Engineer, freelance

Bookings involve slow third parties. Making the client wait for every step made the server slow and the experience worse.

Response time of requests to the server reduced by up to 57%.

PHP · Laravel · PostgreSQL · JavaScript · WebSockets

M2_5 · 2280 · STORED · MAR 2021 – AUG 2021v1FIRST STABLE RELEASE, JUNIORS MENTORED ALONG THE WAY

The first stable admin panel of a travel platform

Travel platform, Chile · Senior Frontend Developer

The administration panel had no stable version, rendered more than it needed to and had no safety net of tests.

The first stable version of the panel, faster through code splitting, lazy loading and memoization, with unit, integration and end-to-end tests; mentoring the junior developers of the team throughout.

React · Redux · Material UI · Jest · Cypress

M2_6 · 2280 · STORED · APR 2018 – FEB 2019+15%MORE SALES AFTER DEVICE ACTIVATION SHIPPED

Device activation that lifted sales 15%

Service payments and mobile top-ups, United States · Full Stack Engineer

Customers could pay and top up, but activating and unlocking devices still happened elsewhere.

Sales increased by more than 15% with the device activation and unlock features.

React · Redux · Node.js · PHP · Laravel · MySQL

M2_7 · 2280 · STORED · SEPT 2009 – JAN 2017s → msACCOUNTING REPORT RESPONSE TIME

Accounting reports from seconds to milliseconds

ERP and business intelligence, Cuba · Database Architect and BI Developer

Accounting reports took several seconds, and management had no real-time view of inventory and financial indicators.

Accounting report response time went from several seconds to a few milliseconds; as head of the Data Architecture Role Committee, I set the standards and trained the teams that applied them.

PostgreSQL · PL/pgSQL · Pentaho · ETL · Data Warehousing · PHP

How I lead

In a computer: Liquid cooling draws the heat away so the processor keeps its pace under load.Here: Surveys, one-to-ones and code reviews let me prevent problems before they heat up, and spot what can be improved while it is still cheap to change.

  1. PreventionDetailed surveys and regular one-to-ones: problems surface while they can still be fixed, not after they have blown up.
  2. Spotting improvementsSystematic code reviews that bring the team’s weak spots to light, and a practice built on them: patterns, architecture, SOLID principles.
  3. Up to datePage speed, good practices and new technologies; AI applied to the team’s daily work, and the training to use it well.

What colleagues say

In a computer: Badges on a case are seals from third parties, not from whoever built it.Here: What people who worked with me say, in their own words.

Liset María Del Val MorellSenior QA EngineerHe consistently goes above and beyond to provide support and share his knowledgeRead the recommendation ↓Collapse ↑

During our time working together, I have witnessed Dayron’s exceptional programming skills and his unwavering dedication to delivering excellence in his work. Not only is Dayron a highly skilled professional, but he is also an outstanding team player. He consistently goes above and beyond to provide support and share his knowledge, making him a pleasure to collaborate with. What impresses me the most about Dayron is his relentless commitment to his profession. He consistently strives to improve himself and stay updated with the latest technologies in the field of software engineering. His ability to quickly adapt to any situation and surpass expectations is truly remarkable.

Antonio Membrides EspinosaSenior Software Engineer, Software Architect and Team LeadVery good knowledge in system and database architecture, query optimization, frontend and backend developmentRead the recommendation ↓Collapse ↑

I have had the opportunity to work with Dayron on several occasions, and he has always proved to be an excellent professional. He presents very good knowledge in system and database architecture, query optimization, frontend and backend development in general. He has very good communication skills and integrates very well into team work, he is very capable in his work, and he presents good skills for organizing tasks. Furthermore, he is characterized by a great spirit of professional improvement. In general, I can say that Dayron is an exceptional colleague who is always willing to help professionally and personally.

Reiseer Mejías AyalaOwner and founder of Indevo Systems LLCHe became Team Lead of the development team with excellent resultsRead the recommendation ↓Collapse ↑

Mr. Dayron proved to be a reliable professional with excellent technical skills and strong problem solving skills. He can quickly learn and master new technologies and take on various roles. Due to his experience, he became Team Lead of the development team with excellent results. He always brings innovative ideas.

Yordan Velez RodríguezCybersecurity and Network Solutions ArchitectGetting the best from every member of the teamRead the recommendation ↓Collapse ↑

Dayron has a huge knowledge about software development, in each component (database, frameworks, middleware, etc.) for web solutions and data analysis. Great partner, professional, excellent person for problem resolution and a great generator of ideas for solutions. Committed, hard worker, and a good person. I recommend him for working in a team and getting the best from every member of the team.

Alberto Domínguez MenéndezGeneral Business ManagerWorks smoothly under pressure, acting with initiative and efficiencyRead the recommendation ↓Collapse ↑

Mr. Dayron is an excellent professional who contributed significantly to the development of e-commerce web applications, highlighting his responsibility and ability for solution integration. During his time at our company, he demonstrated mastery of advanced tools and technologies that allowed us to obtain the best results. Mr. Dayron works smoothly under pressure, acting with initiative and efficiency.

Camilo Cabrera CamachoSenior Software EngineerAlways up to date with what is new in technologyRead the recommendation ↓Collapse ↑

A very good professional, 100% recommended. Always up to date with what is new in technology.

Translated from Spanish

About

In a computer: A portrait silk-screened on the board names who designed it.Here: Who is behind the board: someone who pushes the team forward with AI and with training.

Portrait of Dayron Barrueco
DAYRON BARRUECO

Team lead and software architect with more than 15 years building web platforms.

Payments regulated by the Bank of Spain, travel booking systems, ERP and business intelligence. Since 2019 I lead engineering teams and measure what we improve: code quality, test coverage and the team’s own satisfaction.

Today my work is to push the team forward: bring the advantages of AI models into its daily work, and train people to use them well.

Education

In a computer: The power supply turns mains power into the energy every part runs on; modular cables add what each build needs.Here: My engineering degree is the base everything runs on; on top of it, a constant drive to keep up with everything in technology that moves the sector.

MODEL UCI-2008 · 100-240VCOMPUTER SCIENCE ENGINEERBACHELOR OF ENGINEERINGUNIVERSIDAD DE LAS CIENCIAS INFORMÁTICASHAVANA, CUBA · 2003-2008INPUT · SPANISH NATIVE · ENGLISH B2TITLED2008CPUPCIEPCIESATASATAPERIF
  • Team Management
  • Project Management
  • Software Architecture8 endorsements on LinkedIn
  • Databases
  • SQL
  • React.jsLinkedIn assessment passed
  • Node.jsLinkedIn assessment passed
  • Next.js
  • JavaScript
  • Prisma ORM
  • English B2 Upper IntermediateEF SET certificate, 57/100

Get in touch

In a computer: The rear plate is where the machine connects to the outside world.Here: LinkedIn is the fastest way to reach me, email works too, and the CV downloads from here. Every other port jumps to a part of this page.

BIOS FLASHBACK · CV
LAN · LINKEDINUSB-C · EMAIL
USB · WHAT I DOUSB · WORKUSB · HOW I LEAD
HDMI 1 · PROJECTSHDMI 2 · ABOUT
OUT · BLOGMIC · COLLEAGUESIN · EDUCATION

DAYRON.DEV · I/O REV 2026 · EN / ES

LinkedIn is the fastest way to reach me. Email works too.

LinkedIn · in/dayrondevdayrondev@gmail.comDownload CV