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Dalmiro – Typescript, React, AWS, experts in Lemon.io

Dalmiro

From Costa Rica (UTC-6)

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Front-end Web DeveloperMiddle-to-senior
Back-end Web DeveloperSenior
10 years of commercial experience
AI
E-commerce
Edtech
Fintech
Healthtech
Manufacturing
Music and audio

Dalmiro – Typescript, React, AWS

Dalmiro is a Mid to Senior Full Stack Developer with a strong foundation in React, Node, Next.js, TypeScript, and AWS. With a background in leadership and hands-on development roles across startups and contracting environments, he is ready to bring valuable end-to-end experience to any team. Dalmiro has served as a Tech Lead and Senior Engineer on both front- and back-end initiatives, combining technical execution with mentorship and knowledge sharing. He holds a Bachelor's in Informatics Engineering and has also published technical articles, planned solutions, built POCs, and contributed to scalable product architecture.

Main technologies
Typescript
7 years
React
8 years
AWS
5 years
Node.js
7 years
Next.js
5 years
Additional skills
ChakraUI
Serverless Computing
Context API
CSS
React Query
Docker
HTML
Web Sockets
PostgreSQL
Nest.js
Direct hire
Potentially possible
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Experience Highlights

Tech lead, Senior Full stack developer
Nov 2023 - Apr 20251 year 4 months
Project Overview

A 24/7 e-commerce platform that enables healthcare professionals to purchase products, manage accounts, pay bills, and access detailed reports online. Designed to enhance efficiency, it offers features like one-click ordering, user management within practices, and real-time financial tracking.

Responsibilities:
  • Translated business requirements into clear technical documentation and user stories;
  • Participated in backlog refinement and sprint planning sessions to ensure well-scoped and prioritized tasks;
  • Provided effort estimations for new features and enhancements;
  • Developed key features from the ground up, including integrations with tools such as Salesforce and Segment, as well as modules for invoicing, reporting, shopping cart functionality, and credit card payments, ensuring compliance with audit standards required by Chase.
Project Tech stack:
Nest.js
GraphQL
React
Contentful
AWS
Amazon SNS
Amazon SQS
Amazon RDS
Serverless Computing
EventBus
Datadog
Apollo GraphQL
Redux
React Hooks
Salesforce
Figma
Typescript
Prisma
Jest
Node.js
Senior Full-Stack Developer
Jul 2022 - Nov 20231 year 3 months
Project Overview

An AI-powered industrial recruiting platform that connects manufacturers with over 2 million skilled trades professionals across more than 150 roles. Its proprietary AI assistant automates candidate sourcing, screening, and engagement, streamlining the hiring process for HR teams.

Responsibilities:
  • Led the automation of sentiment analysis and resume enhancement features through AI integration;
  • Developed key features such as automatic resume generation, platform visualization, and export functionalities;
  • Enhanced the job search experience by improving UX and delivering more relevant job leads;
  • Championed test coverage and promoted best practices in backend testing and logging strategies;
  • Refactored the core legacy BE, implementing new technologies and patterns in Node.
Project Tech stack:
React
Node.js
Firestore
OpenAI
PostgreSQL
AWS
Redux
HTML
CSS
Material UI
Docker
Typescript
TypeORM
Jest
Tech Lead
Aug 2022 - Sep 20231 year
Project Overview

An all-in-one live music booking platform designed to streamline and simplify the event booking process for independent venues, festivals, restaurants, and cafes. By replacing traditional methods like email threads and spreadsheets, it offers a centralized hub for scheduling, contracts, marketing assets, and payments, reducing the booking process from weeks to minutes.

Responsibilities:
  • Joined the project at the final hour before the official production release. Quickly ramped up within a week to provide critical improvements, meet tight deadlines, and successfully launch the app;
  • Took ownership of resolving high-priority production issues and provided mentorship to junior developers;
  • Collaborated directly with the CTO to help drive the overall technology strategy and implementation roadmap;
  • Rebuilt REST API integrations from scratch to replace poor-quality code delivered by a previous vendor;
  • Led the development of the venue and client reservation workflow module, enhancing the platform's core functionality;
  • Successfully scaled the platform from 15 venues to over 100, supporting rapid business growth.
Project Tech stack:
Node.js
Next.js
i18next
AWS
MySQL
Prisma
Jest
Typescript
Microservices
Jira
Scrum
Context API
React Query
REST API
Nest.js
Technical Lead, Founding Engineer
Jun 2021 - Jul 20221 year 1 month
Project Overview

A US-based edtech company that aims to deliver high-impact, personalized online tutoring. It provides one-on-one and small group tutoring in reading, math, and English language acquisition, supported by its proprietary Tutoring Management System (TMS). The platform integrates with existing district tools and data, enabling customized, outcomes-driven programs that align with classroom instructions.

Responsibilities:
  • Was the first engineer on the team, working directly with the CEO;
  • Led the development of the MVP from its early stages through to securing support from the Gates Foundation;
  • Took on the role of technical lead for two teams simultaneously (one focused on front-end development and the other on full-stack development), after the team grew to over 20 developers from different time zones;
  • Together with the team, scaled the platform from zero to supporting hundreds of educational organizations;
  • Was responsible for shaping the core online platform experience, building key features from scratch, including a virtual assessment library, waiting rooms, feedback modules, and payment integrations with Stripe.
Project Tech stack:
Nest.js
Next.js
PostgreSQL
Redis
AWS
React
Context API
React Query
Docker
Web Sockets
HTML
CSS
ChakraUI
Serverless Computing
Typescript
Prisma
Senior Full-Stack Developer
Apr 2020 - Jun 20211 year 2 months
Project Overview

A global leader in essential oils and wellness products, founded in 1993. Offering a diverse range of essential oils, personal care items, and home products, it operates through a multi-level marketing model with a vast network of independent distributors worldwide.

Responsibilities:
  • Led the migration of the existing AngularJS platform to React, following the latest best practices and modern conventions;
  • Refactored and improved RESTful endpoints in C#, ensuring adherence to clean code principles and performance best practices;
  • Developed and tested core frontend components, isolating them in Storybook for better reusability and documentation;
  • Built and maintained a scalable front-end component library to standardize UI across the application;
  • Mentored mid-level and junior developers, guiding code quality, architecture, and team workflows;
  • Authored technical documentation to support development, onboarding, and cross-team collaboration;
  • Held direct technical discussions with clients to troubleshoot and replicate issues efficiently;
  • Designed and executed integration tests to ensure seamless functionality across systems.
Project Tech stack:
.NET
.NET Core
MobX
React
Typescript
Entity
AWS
Serverless Computing
SQL
Context API
React Query
Angular
API testing
Jest
Enzyme
REST API
Scrum
Tech lead, Senior Full-Stack Developer
Dec 2017 - Apr 20202 years 3 months
Project Overview

A financial services firm that optimizes cash and deposit solutions for individual, commercial, and government clients. It provides stable funding to over 1,000 insured depository institutions across the U.S.

Responsibilities:
  • Completely refactored the Stripe payment integration to improve reliability and maintainability;
  • Enhanced the client’s withdrawal experience by refactoring legacy code and migrating old implementations to modern Node.js microservices;
  • Optimized performance in the main React UI through effective caching strategies and improved database efficiency using techniques such as temporary tables, query optimization, and index tuning;
  • Contributed to the early design and structure of the design system, helping establish a consistent and scalable UI framework;
  • Created technical documents of new business Ideas, also providing estimations for the dev team;
  • Mentored colleagues.
Project Tech stack:
Spring Boot
Next.js
React
Nest.js
Typescript
AWS
MySQL
MongoDB
Microservices
Redux
Docker
Node.js
Material UI
CSS
HTML
XML
REST API
Jest

Education

2017
Informatics Engineering
Bachelor's

Languages

English
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