Senior Software Engineer · Barcelona

I design and build software that works in the real world.

15+ years building web and mobile applications, backend systems, software architecture and infrastructure. I help companies turn complex ideas into reliable, maintainable products.

From architecture and APIs to mobile applications, cloud infrastructure and AI-powered features — I work across the entire stack.

Start a conversation→View selected work↓
~/pablo
$ whoami
pablo.bertran
$ role
senior-software-engineer
$ location
Barcelona, Spain
$ focus
software · architecture · product
pipeline
IDEA→ARCHITECTURE→CODE→INFRASTRUCTURE→PRODUCT
15+ years
Software development
Web + Mobile
End-to-end product development
Full stack
Frontend → backend → infrastructure
Product minded
Architecture → production
01 / Work

Selected work

A few things I've built, shipped or helped bring to production.

ReactIonicCapacitorTypeScriptNode.jsMongoDBDockerCloudflare R2
01 — Problem
Freelancers in Spain manage their finances across bank apps, spreadsheets and their accountant's inbox. Saverio brings tracking, expenses, invoicing and tax estimation into a single product that reflects how autónomos actually work — quarterly filings included.
02 — Constraints
  • ·Spanish invoicing regulation, including Verifactu requirements
  • ·Banking integrations with heterogeneous data quality
  • ·One codebase serving web, iOS and Android
  • ·Financial data: correctness and auditability are non-negotiable
  • ·Small team — architecture had to stay simple enough to move fast
04 — What I built
  • ·Product and data model decisions alongside the engineering
  • ·API design and backend services for transactions, expenses and invoicing
  • ·Tax estimation logic mapped to autónomo filing cycles
  • ·Cross-platform mobile app with Ionic and Capacitor
  • ·Document storage and generation pipeline on R2
  • ·Authentication, authorization and account management
  • ·Containerised deployment, CI/CD and environment configuration
05 — Result
An end-to-end product in production, owned technically from architecture to deployment — a system that can absorb new regulation and new integrations without a rewrite.
03 — Architecture
architecture
  1. 01Mobile & web client (Ionic + Capacitor)
  2. 02REST API (Node.js + TypeScript)
  3. 03Domain services: invoicing · tax · transactions
  4. 04MongoDB data models
  5. 05Object storage (Cloudflare R2)
  6. 06External integrations: banking · Verifactu
02 / Expertise

What I bring to a project

01

Software Engineering

Production-grade frontend, backend and mobile applications.

TypeScriptReactNode.jsIonicCapacitorAPIsMongoDB
02

Architecture

Designing systems that are maintainable today and scalable tomorrow.

System architectureAPIsDesign patternsData modellingIntegrations
03

AI & Automation

AI is a tool. The goal is better software and better business outcomes.

LLM integrationsAI product featuresDocument processingAgentic workflowsAutomation
04

Infrastructure & DevOps

Taking software beyond the local machine.

DockerLinuxCI/CDNginxCloudMonitoringLogging
I work across the whole stack
PRODUCT
FRONTEND
  • Angular
  • React
  • Ionic
  • Mobile
BACKEND
  • Node.js
  • APIs
  • MongoDB
  • MySQL
AI
  • LLMs
  • Automation
  • Agents
INFRASTRUCTURE
Docker · Linux · CI/CD
03 / Process

From idea to production.

  1. 01

    Understand

    Understand the business problem, constraints and desired outcome.

  2. 02

    Architect

    Choose the right architecture, technologies and trade-offs.

  3. 03

    Build

    Implement clean, maintainable software with a strong focus on the actual product.

  4. 04

    Ship

    Deploy, monitor and validate the system in the real world.

  5. 05

    Improve

    Iterate based on data, feedback and changing requirements.

04 / Now

Now

What I'm doing at the moment.

Last updated · 2026
Currently building
Saverio

A financial platform for Spanish autónomos.

Currently exploring
AI-powered software

Practical ways to integrate AI into real products, workflows and developer tooling.

Currently working with
Web · Mobile · Backend · Infrastructure

Full ownership from architecture to production.

Based in
Barcelona, Spain

Working remotely with teams anywhere.

Open to
Selected projects

Interesting engineering projects, consulting and senior contract work.

05 / About

A little about me.

I'm Pablo, a software engineer based in Barcelona. I've been building software for more than 15 years, working across web, mobile, backend systems, architecture and infrastructure.

I enjoy understanding how things work, finding simple solutions to complicated problems and building products that people actually use.

Outside of work, mostly: technology · travelling · music · climbing · building things.

Pablo Bertran, software engineer, at a climbing gym
Experience
2026 — present
Founder & Software Engineer → Highr.club

CRM for private clubs. React + Electron desktop application integrated with RFID readers, QR scanners and printers for member attendance and stock management. Built end to end.

2026 — present
Founder & Software Engineer → Saverio

Product architecture, backend services, cross-platform mobile app, integrations and infrastructure for a financial platform for Spanish autónomos.

2022 — present
Full Stack Developer (Contractor) → PowUnity

Three and a half years on a GPS tracking product for bikes, motorcycles and vehicles: mobile and web applications, backend services, telemetry, alarms and infrastructure.

Professional work
Web & Mobile Developer → Boehringer Ingelheim — Patient Support Programme

Patient-facing web and mobile application for a global pharmaceutical company, delivered within enterprise privacy, validation and release processes.

15+ years
Senior Web & Mobile Developer → Independent / Freelance

Custom web and mobile solutions for clients across sectors, from single-page applications to full product builds with backend and infrastructure.

Full career history on LinkedIn →
06 / Toolbox

Technology I work with

Languages
TypeScriptJavaScriptSQL
Frontend
ReactIonicAngularVite
Backend
Node.jsREST APIsMongoDBMongoose
Mobile
iOSAndroidCapacitorIonic
Infrastructure
DockerLinuxNginxCI/CDCloud services
Observability
GrafanaLokiLoggingMonitoring
AI
LLMsAI APIsAI workflowsAutomation
07 / Contact

Have something worth building?

Tell me what you're working on. If I can help, let's talk.

LinkedIn ↗GitHub ↗Email ↗
Barcelona, Spain
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