Sebastian Arriaza

Typescript Developer

SeniorBackend Developer

5years in Frontend

6/10Data Layer & Database

5repositories checked by code analysis

Overview

Backend API engineer (Senior) focused on building production Node.js REST services with careful transactional MySQL integration and SSO provisioning. The strongest proven skill is transactional Google SSO user provisioning implemented in src/services/authUserService.js which includes connection-level transactions, role/country upsert logic and careful persisted-user shaping. There is limited public evidence of automated tests, structured observability (metrics/tracing) and production operational hardening like secure cookie enforcement, rate limiting or background queueing.

Phone

Timeline

Senior TypeScript Engineer / Contentful Platform Developer · Senior

Lonely Planet (Red Ventures) · Full-Time

Mar 2026 to Present 8 Months In office

Designed and built enterprise-grade TypeScript automation and tooling for a large Contentful ecosystem. Implemented workflows for content migration, synchronization, validation, publishing, deduplication, auditing, and data-quality remediation across multiple spaces and environments. Developed integrations using Contentful Management/Delivery APIs, GraphQL/REST, webhooks, and event-driven processing. Contributed to Elixir-based backend services and Contentful pipelines, improving reliability and CI/CD for long-running jobs.

TypeScript

Elixir

GraphQL

Rest API

GitHub Actions

AWS

CI/CD

Senior Full Stack Developer · Senior

Ingemann Data A/S · Full-Time

Jan 2025 to Mar 2026 1 Year 2 Months In office

Led development of geospatial and agroclimatic platforms, focusing on scalable backend services and spatial data APIs. Designed spatial database architecture and bulk-processing workflows, improving performance for large datasets. Delivered interactive geospatial visualization features and supported engineering decisions for raster and spatial pipelines. Built and maintained application layers using Angular and NestJS.

Angular

Nest.JS

PostGIS

Full Stack Web Developer · Middle

COMPROSA · Full-Time

Jan 2024 to Jan 2025 1 Year In office

Integrated Softland ERP and built/maintained Express.js APIs, including middleware-style integrations with MuleSoft. Coordinated delivery of an Angular frontend and automation workflows for notifications and tracking. Supported electronic invoicing and worked alongside legacy ASP.NET components to connect business processes and services. Contributed to backend/API integration and operational improvements across the application stack.

MuleSoft

Angular

ASP.NET Core

Rest API

Systems Manager / Full Stack Developer · Lead

Trust Correduria de Seguros · Full-Time

Jan 2025 to Present In office

Managed lifecycle operations for internal applications and implemented new features across web and backend layers. Built solutions using Python and Django with PostgreSQL, plus React and TypeScript for the frontend. Administered AWS EC2 infrastructure and Windows/Linux servers, covering security, continuity, and operational integrations. Integrated communication services and supported production support workflows using Git/GitHub and APIs.

Python

Django

PostgreSQL

React.js

TypeScript

AWS

Linux

Windows

Git

GitHub

Twilio

Web Team Supervisor / Senior Web Developer / WordPress Developer · Senior

Top Floor Marketing · Full-Time

Jan 2021 to Jan 2024 3 Years In office

Advanced from WordPress developer roles to senior web delivery and team supervision. Built custom WordPress plugins and WooCommerce solutions, including REST-based integrations and headless WordPress applications using React and Next.js. Led web delivery and technical support, covering performance/SEO optimization and hosting operations. Coordinated engineering efforts and ensured stable production support for marketing and commerce sites.

WordPress

WooCommerce

React.js

Next.js

Rest API

Web eCommerce Administrator / Project Manager · Lead

ZiggyTec · Full-Time

Jan 2024 to Present In office

Managed eCommerce catalog data, product attributes, pricing and availability, and coordinated UX improvements. Implemented headless commerce architecture with React/Next.js and integrated eCommerce financial operations. Supported cross-functional logistics workflows and operational reporting, ensuring data consistency between systems. Worked on product and catalog workflows while improving automation around operational processes.

React.js

Next.js

QuickBooks

Full Stack Developer / Web Developer · Middle

NUMU Digital / IT Lab Panama · Full-Time

Jan 2018 to Jan 2021 3 Years In office

Developed business web applications with REST integrations and contributed to deployment workflows. Delivered solutions that involved IIS and Windows Server environments for hosting and runtime support. Supported system integration and application maintenance across backend and web layers. Worked on end-to-end development tasks from integration to deployment and operations.

Rest API

Windows Server

Universidad Americana (UAM)

Bachelor's Degree · Information Technology Management

2014–2019 Panama, Panama

Projects

Amplitude Analytics for COMPROSA

Implemented Amplitude analytics for eCommerce and business applications. Designed event tracking for user behavior, conversion funnels, journeys, segmentation, retention, and feature adoption. Integrated analytics events across frontend and backend services and created stakeholder dashboards for reporting and decision support.

Via Logistics UK Logistics Platform

Architected a logistics ecosystem combining Next.js and Express-style backend services with MongoDB-based data management. Implemented WordPress/WooCommerce integrations and role-based access controls for users. Added operational workflows and reporting features, focusing on automation of logistics processes and cross-system interactions.

ADN Cleaning Services UK Booking Platform

Developed and maintained a UK service booking platform with online scheduling and administration tools. Implemented notification and customer workflow features, plus operational management capabilities for the business. Built and deployed the application to the cloud and automated key email/communication flows for users and admins.

Glasswing International Automation

Built automation solutions to support volunteer management and organizational operations. Implemented bots and workflow automation for synchronization, validation, reporting, notifications, and operational tasks. Integrated third-party platforms and internal systems and applied AI-assisted development approaches to reduce repetitive manual work.

Technical skills

Languages

TypeScript

Python

Node JS

JavaScript

SQL

C++

Elixir

PHP

Apex

Node JS

Nest.JS

Express

Passport.js

Frontend

React.js

Next.js

Angular

DevOps

Rest API

AWS

Windows Server

GitHub

Git

Linux

Windows

Other

WooCommerce

WordPress

MuleSoft

ASP.NET Core

PostgreSQL

Django

PostGIS

Twilio

Dotenv

Laravel

Bootstrap

Amazon S3

MySQL

Amazon EC2

GitHub Actions

Ajv

Angular Material

Docker

Amplitude

GraphQL

CI/CD

Mixpanel

Senior Backend Developer Confidence: High API Engineer

API Design

5/10

How well APIs are designed

API design is pragmatic and consistent with clear REST endpoints, input validation and useful error responses, but lacks explicit versioning, idempotency keys and formal pagination conventions across all endpoints.

Evidence

src/routes/auth.js: authentication endpoints, registration-country endpoints and /google/config exposing OAuth and portal details

src/server.js: many REST endpoints (trainings, sessions, volunteer-attendance, volunteer-documents) with consistent JSON error responses

Data Layer & Database

6/10

Working with databases

Data layer shows deliberate decisions: use of transactions for user provisioning, parameterized queries, upserts (ON DUPLICATE KEY), and runtime schema evolution (CREATE TABLE IF NOT EXISTS + ALTER), indicating DB-aware backend design.

Evidence

src/services/authUserService.js: persistGoogleUser uses pool.getConnection(), beginTransaction(), commit/rollback and parameterized execute calls

src/routes/volunteerOnboarding.js: ensureProgressTable creates volunteer_onboarding_progress table and ALTERs to add missing columns

src/config/tables.js: centralized table metadata, jsonFields and enums used to drive CRUD configuration

Scalability & Performance

3/10

Handling load and speed

Basic scalability patterns are present (MySQL connection pooling, query limits), but there is no caching strategy, no queue-based decoupling, and no documented rate limiting or measured performance tuning.

Evidence

src/server.js: uses pool.query with LIMIT and heavy aggregation queries (reports/attendance-progress)

package.json: dependency on mysql2 (pool likely configured in src/config/db.js) referenced across many handlers

System Architecture

5/10

Overall system structure

Clear module separation (config, routes, services, middleware) and centralized table/config metadata reflect purposeful service structure, but this is a single monolith service without multi-service decomposition or advanced config/secret management shown.

Evidence

src/server.js: wires routers, middleware and config centrally

src/config/tables.js and src/config/env.js (env referenced) show configuration centralization and table-driven design

src/services/authUserService.js and src/services/countryPortalService.js: responsibilities split into services

Security & Auth

5/10

Protecting data and access

Strong points include secure password hashing (pbkdf2 with high iterations), timing-safe verification, parameterized queries and session hardening flags; missing are token lifecycle controls, refresh/revocation strategies and some cookie 'secure' settings for production.

Evidence

src/routes/auth.js: hashPassword uses pbkdf2 with iterations=310000 and verifyPassword uses crypto.timingSafeEqual

src/services/authUserService.js: transactional user creation and upsert which avoids race conditions

src/server.js: session configuration uses httpOnly and sameSite flags

Reliability & Observability

3/10

Stability and monitoring

Error handling is consistent with try/catch and a central error handler and database error introspection, but there is limited structured logging, correlation ids, retries/backoff, graceful shutdown, or metrics/alerts evidence.

Evidence

src/server.js: central error middleware that logs via console.error and returns DB error details in responses

Multiple route files: consistent try/catch patterns around DB operations (e.g., src/routes/auth.js, src/routes/volunteerOnboarding.js)

Verified artifacts

Truscorreduria/cotizador· contrib Truscorreduria/api-cotizador· contrib

Expertise

Node.js· Middle

Databases & Vector Storage· Senior

Technologies

Python· since 2025 · Middle

PHP

C#· since 2024 · Junior

Elixir· since 2026 · Middle

Rest API· since 2018

GraphQL· since 2026

Laravel

WordPress· since 2021

WooCommerce· since 2021

Django· since 2025

ASP.NET Core· since 2024

Passport.js

Dotenv

Recommendations

Develop new REST APIs and integration endpoints that require careful transactional guarantees and idempotent user provisioning (SSO flows, account linking).
Implement onboarding and user-facing workflows that need server-side validation and schema evolution (volunteer onboarding, form requests and attendance reporting).
Lead work to add observability and reliability: structured logging (request ids), metrics, graceful shutdown and basic rate limiting.
Build database migration scripts and CI-driven schema evolution instead of runtime ALTERs for production deployments.

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

glasswing-api-deploy sarriaza95 ppulegal

Middle Game Developer Confidence: High Generalist

Middle full-stack web developer focusing on production-ready Express and Next.js applications with reliable OAuth and relational database workflows. Proven strength is building transactional Google SSO and MySQL-backed user onboarding and auth flows as implemented in src/services/authUserService.js and src/routes/auth.js. The public codebase shows no game development artifacts, no automated tests, and limited evidence of high-performance or platform-level engineering.

Gameplay Systems & Mechanics

How game logic works

Not evidenced in public code

Graphics & Rendering

Drawing game visuals

Not evidenced in public code

Physics & Math

Game physics and math

Not evidenced in public code

Engine Proficiency

Skill with the game engine

Not evidenced in public code

Performance & Frame Budget

Keeping the game smooth

Not evidenced in public code

Content Pipeline & Tooling

Tools for game content

Not evidenced in public code

Industries

Financial Services· Middle

Recommendations

Develop production web APIs that require OAuth integration, transactional DB logic and robust error handling.
Implement user onboarding, admin CRUD surfaces and session-based features for data-driven SaaS products.
Build Next.js frontends and integrate them with REST APIs and token-based auth flows.
Improve project quality by adding automated unit and integration tests and CI for schema migrations and deployments.

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

glasswing-api-deploy cotizador

Junior Frontend Developer Confidence: Medium Fullstack

Full-stack developer at a senior level with a clear strength in building production Express APIs and MySQL-backed transactional workflows. The strongest proven skill is backend engineering for auth and persistence as shown by the Google SSO persistence and transactional user/role/country logic in src/services/authUserService.js. There is little public evidence of automated tests, CI, or original frontend architecture beyond adapted templates and theme customizations.

UI Component Architecture

2/10

How interface parts are built

Limited original frontend component design; most UI is template-based with small customizations rather than a homegrown component system.

Evidence

sarriaza95/opticare-app/src/app/components/components.module.ts sarriaza95/opticare-app/src/app/components/sidebar/sidebar.component.ts sarriaza95/opticare-app/src/app/components/footer/footer.component.ts

Responsive & Cross-browser

2/10

Works on all screens and browsers

Uses standard responsive frameworks (Bootstrap / Material) and some responsive CSS; no evidence of advanced responsive strategies like container queries or RTL readiness beyond the template defaults.

Evidence

sarriaza95/opticare-app/documentation/css/demo-documentation.css sarriaza95/opticare-app/package.json

Performance Optimization

2/10

Speed of the interface

Some lightweight performance care in UI scripts (debounce, limited DOM optimizations) but no measured frontend perf work or bundle-splitting evidence; backend uses pooling and query limits (not counted for frontend perf).

Evidence

sarriaza95/opticare-app/documentation/js/initMenu.js sarriaza95/opticare-app/documentation/js/material-dashboard.js

Accessibility & Semantics

1/10

Usable for everyone

Minimal explicit accessibility work; some third-party templates include ARIA/role attributes but no evidence of custom a11y on bespoke widgets or CI axe checks.

Evidence

sarriaza95/opticare-app/documentation/js/bootstrap-notify.js

State Management & Data Flow

1/10

Managing data in the app

Frontend state-management and async discipline is not evidenced; routing exists in an Angular template but there are no custom state machines, request-cancellation or optimistic update patterns in the UI code.

Evidence

sarriaza95/opticare-app/src/app/app.routing.ts

UX & Visual Polish

3/10

Look and feel quality

Visual polish is high due to use of a Material dashboard template and custom styles; however much of this is template-derived rather than bespoke UX engineering addressing edge states or progressive loading.

Evidence

sarriaza95/opticare-app/documentation/css/demo-documentation.css sarriaza95/opticare-app/documentation/js/material-dashboard.js sarriaza95/opticare-app/documentation/js/bootstrap-notify.js

Expertise

Angular· Junior

Technologies

JavaScript

TypeScript· since 2025 · Senior

Node JS· Senior

Nest.JS· since 2025

Next.js· since 2021

Express

GitHub Actions· since 2026

Angular· since 2024

CI/CD· since 2026

Bootstrap

Windows Server· since 2018

Git· since 2025

AWS· since 2025

Docker

React.js· since 2021

Amazon EC2

Ajv

Angular Material

GitHub· since 2025

Amazon S3

Linux· since 2025

Windows· since 2025

GitHub· mentioned only

Recommendations

Lead backend or BFF development that requires secure SSO flows, transactional user upserts and MySQL integration (e.g., user identity, onboarding, role/country management).
Implement API-first feature work for volunteer/education platforms where session/attendance workflows and ETL-like reports are needed.
Harden delivery by adding automated tests (unit + integration), CI configuration and audit/fuzz tests around auth and file upload flows.
If expanding frontend responsibilities, rebuild templated UI components into a small custom component library with explicit accessibility and async-state handling (cancellation, optimistic updates).

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

opticare-app glasswing-api-deploy sarriaza95

Job preferences

Work permits: Nicaragua
Citizenship: Nicaragua
Employment type: Full-Time

Open to AI agents: they read this profile and start a dialog through Alionalion.io/@sebastian-arriaza/mcp