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Profile

Another portrait of David LJ wearing the same and in the same pose. But appears surprisedA portrait of David LJ. Slightly smiling. Wears 80'ish glasses and a green and black plaid shirt
Hey! 👋 Nice to see you again
David LJ@davidlj95
Senior software engineer

Tech stack

Backend

  • PostgreSQL
  • Amazon RDS
  • TypeScript
  • Node.js
  • Express
  • Redis
  • Ruby
  • Ruby on Rails
  • Sidekiq
  • Python
  • ... (+ 13 more)

Frontend

  • CSS
  • HTML
  • Angular
  • TypeScript
  • PWA
  • Android
  • Node.js
  • Flutter
  • iOS
  • Python
  • ... (+ 13 more)

Infrastructure

  • Docker
  • Amazon S3
  • AWS Elastic Load Balancing
  • GitHub Actions
  • Amazon API Gateway
  • Amazon Cognito
  • Amazon EKS
  • Amazon Identity Access Management
  • AWS Secrets Manager
  • Datadog
  • ... (+ 11 more)

Professional experience

Open sourcing & freelancing logo

Open sourcing & freelancing

Software Engineer

Summary Highlights
Taking a break from corporate. Focused on technical learning on topics I had noted as interesting but didn't have the time until now. For instance: semantic release, understanding Angular in-depth, JavaScript/Typescript bundling optimizations and maintaining (npm) open source libraries. On the soft skills side, read several books about team culture and management
Vesto logo

Vesto

Senior Backend Engineer

Summary Highlights Tech
Backend: web APIs and background processing. Led, engineered and assisted many product features. Planned robustness proposal to improve the app stability by reducing error rates. Focusing on gaining observability to push for data-driven decisions. Optimized processes to reduce customer support workload
Koa Health logo

Koa Health

Senior Software Engineer

Summary Highlights Tech
Full stack: web APIs backend, web app and mobile app. Led, engineered and assisted several features. Coordinated with product, design, QA, DevOps, cybersecurity, research & other products' engineering teams. Enhanced the company's design system library. Supported several squad's processes improvements
Telefónica Alpha logo

Telefónica Alpha

Software Engineer

Summary
Part of the health moonshot unit. Which would later spin off to become its own company: Koa Health. Check that position for more information about both periods
BTC Assessors logo

BTC Assessors

Software Engineer

Summary Highlights Tech
Full stack: web apps and peer to peer / web API backends. Lead software engineer for all company's projects. Blockchain / DLT consultant and researcher. Board member of the company's own cryptocurrency investment fund as technical advisor
SEAT logo

SEAT

Software Engineer

Summary
Organized integration of IBC Biomechanics software within SEAT IT systems. In order to be used for its internal biomechanical laboratory in the CARS center inside Martorell headquarters
Meditrauma logo

Meditrauma

IT Manager

Summary Highlights
Administered IT systems and infrastructure of each of the three company branches. Performing systems administration tasks and general IT consultancy
IBC Biomechanics logo

IBC Biomechanics

Software Engineer

Summary Highlights Tech
Developed a reporting application. Created several proofs of concept apps to connect to biomechanical devices using Bluetooth. Managed the IT systems of the company

Education

Universitat Oberta de Catalunya logo

UOC

Master's degree - MISTIC (Cybersecurity)

Score Courses
Unfinished. 8.14 over 10 (3.38 over 4 GPA)
Universitat Autònoma de Barcelona logo

UAB

University degree - Computer Science

Score Courses
Cum laude. 8.86 over 10 (3.85 over 4 GPA)
Institut de Mollet del Vallès logo

IES Mollet

High school - Science and Technology

Score Courses
Cum laude. 9.76 over 10 (3.96 over 4 GPA)

Projects

Vesto app logo

Vesto app

Senior Backend Engineer

Description Tech
Worked on backend stack. Mobile app to introduce users to the world of financial investments. Allows to easily invest in US stock market with card or Bizum. Focused for Spanish market
Mindset logo

Mindset

Senior Software Engineer

Description Tech
Worked in full stack. Mobile app for patients to treat depression using Cognitive Behavioral Therapy (CBT) exercises. Web app for therapists to track patients' progress
Cowstamp logo

Cowstamp

Lead Software Engineer

Description Tech
Worked in full stack. Web SaaS app to create, issue and receive verifiable credentials digitally signed using blockchain technologies with a user-centric design. Uses a custom ad hoc library to canonize JSON-LD graphs

Kowbucha

Lead Software Engineer

Description Tech
Web app to allow an independent verification of Blockcerts verifiable credentials based upon users' trust decisions. Uses a companion NodeJS & browser Javascript library created ad hoc to perform the verifications.
NodeCenter logo

NodeCenter

Software Engineer

Description Tech
Worked in full stack. Application to manage blockchain / DLT nodes deployments in few clicks with an easy to use web interface, based on an Open API documented REST API exposed by a companion app daemon
Bitcoin Framework logo

Bitcoin Framework

Lead Software Engineer

Description Tech
Bitcoin library to create transactions with smart contracts (scripts) based on puzzle-friendliness and object oriented programming (OOP)
IBC Report Generator logo

IBC Report Generator

Lead Software Engineer

Description Tech
Worked in full stack. Desktop application to generate biomechanics reports out of data extracted from third party applications and devices using user-created report templates
Police Translator logo

Police Translator

Lead Software Engineer

Description Tech
Worked in full stack. Hybrid mobile application with a collection of useful phrases for police officers translated between English and Catalan. Includes audio pronunciations and supports offline mode. Custom contents manager as web application

Languages

{es}

Spanish

Native

{ca}

Catalan

Native

{en}

English

Advanced

Certified B2 CEFR level