Jesús Izquierdo

Senior Software Engineer | C++, Python, SaaS

I build high-performance C++ systems and scalable Python backends for companies that value engineering culture

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Available for senior contract engagements (3+ months).

Open to selective full-time remote roles if there's a strong fit.

Jesús Izquierdo - Senior Systems Architect

About Me

I am a Senior Software Engineer with 10+ years building high-performance C++ systems and scalable Python infrastructure, mainly for 3D-focused SaaS products. My experience as a freelance consultant spans from performance-critical pipelines and distributed systems to end-to-end product architecture.

I have spent the last 4 years working 100% remotely (both full time and as a contractor) for international teams across Europe and the US.

I thrive on solving complex technical challenges where performance, scalability, and maintainability matter. I focus on delivering robust infrastructure that works reliably in production.

When I'm not coding, I'm usually tinkering with my own side projects or spending time with my family.

Education: MSc & BSc in Industrial and Electronics Engineering from Universidad de Alcalá (2011-2017).

How I Can Help

Contract & Consulting

In B2B, I collaborate with teams on medium-to-long term technical engagements where senior ownership and execution matter.

Typical collaborations involve stepping into complex codebases, identifying critical technical risks, and delivering robust, production-ready solutions.

Typical engagement: >3 months · focused, high-impact collaboration

Full-Time Remote Roles (Selective)

While my primary focus is contract work, I'm open to full-time remote roles with teams building technically ambitious products and maintaining a strong engineering culture.

I bring 10+ years of experience working on complex systems across international, fully remote teams.

What I'm looking for: technically challenging problems, high-quality engineering culture, and 100% remote collaboration.

Consulting Services

I help teams solve technically demanding problems where performance, scalability, and long-term maintainability are critical.

Typical areas I work on

My work is focused on clarity, correctness, and production-ready results — not short-term fixes.

Featured Project

MiniaturZ - Real-Time 3D Therapy Platform

Jan 2025 - Present

Engineered end-to-end SaaS from scratch: a real-time, multi-user 3D platform enabling therapists to replicate a specific clinical technique with their patients online.

Key Engineering Achievements:

  • • Solved critical 3D rendering performance bottlenecks with custom asset preloading system and KTX2/Draco compression for efficient loading.
  • • Architected full infrastructure: containerized microservices, WebRTC for video calls, Stripe for subscriptions, and CI/CD pipeline.
  • • Built real-time multiplayer 3D synchronization using custom protocol over WebSockets (Socket.IO).
Next.js TypeScript Three.js WebRTC Socket.IO Docker Stripe
Play the demo!

Selected Technical Work

Triangulator — Hybrid C++/WASM Geometry Processing System

A technical showcase demonstrating production-grade C++ architecture, WebAssembly integration, and performance-oriented system design.

Engineering Highlights

  • • Hybrid Compute Architecture: Seamlessly switches between server-side (native C++) and client-side (WASM) execution
  • • WebAssembly Optimization: Shared C++ core library compiled with Emscripten/embind for zero-copy JS interop
  • • Scalable Microservice: Stateless API design using cpp-httplib, containerized with multi-stage Docker builds
  • • Production-Ready Gateway: Cloud-native deployment with Caddy (auto-SSL) and Nginx for optimized delivery
Triangulator - Geometry Processing Systems Demo
C++17 WebAssembly Emscripten CMake Docker GoogleTest
Source Code

Relevant Experience

Senior Software Engineer - Contract

Omi · Paris, France (Remote)

Aug 2025 - Dec 2025

SaaS platform enabling brands to create photorealistic 3D models and generate product visuals for marketing and AR.

  • • Architected C++ asset processing pipelines for 3D model integration with external platforms
  • • Enhanced in-house artist tools, improving asset processing and scene-building workflows
  • • Spearheaded performance optimization across applications (C++, Qt), backend rendering pipelines, and real-time webviews (OpenGL)
  • • Contributed to a modular codebase, with build systems like CMake and QMake participating in peer code reviews for quality
  • • Integrated AI-generated pipelines into C++ asset processing system, enabling automated assets creation
  • • Automated artists workflows with Python scripts

Senior Software Engineer

SEDDI · New York, US (Remote)

May 2022 - Aug 2025

Fashion industry SaaS products for texture digitalization and 3D fabric simulation in real-time on the browser.

  • • Designed and implemented high-performance, scalable HPC services in C++ to support real-time 3D rendering and simulation workloads
  • • Delivered robust backend microservices and APIs using Python/Flask, enabling scalable and asynchronous jobs
  • • Built tools, libraries, and Docker-based CI/CD pipelines to streamline development workflows, improving developer productivity and system reliability
  • • Identified and resolved bottlenecks in distributed processing, enhancing system scalability and performance
  • • Led code quality initiatives, including refactorings, linting, and high test coverage (Google Test, Pytest), ensuring maintainable and reliable codebases.

Software Engineer

Grupo Epelsa · Madrid, Spain

Oct 2015 - May 2022
  • • Developed multithreaded C++ application for distributed Linux embedded systems
  • • Designed communication protocols using TCP/IP sockets and Python services
  • • GUI design (GTK library), unit testing and MariaDB SQL administration
  • • Full lifecycle development of software: requirements, prototyping, implementation, and testing
View Full Resume (PDF)

Technical Expertise

Systems & Performance

C++17/20 · Python · High-Performance Computing (HPC) · Distributed Systems · Multithreading · CMake · QMake

3D & Graphics

OpenGL · Three.js · React Three Fiber · Blender · WebGL · KTX2 · Draco · Qt

Backend & Infrastructure

Flask · FastAPI · Docker · CI/CD · Microservices · WebRTC · Socket.IO · Linux · RabbitMQ · Google Cloud · SQL (PostgreSQL, MySQL) · MongoDB

Full-Stack (side projects)

Next.js · TypeScript · React · Tailwind CSS · Node.js · Stripe Integration

Software Engineering

Design Patterns · SOLID Principles · Agile · Code Reviews · Refactoring · Git

Languages

Spanish (Native) · English (Full professional)

Endorsements

"Jesus was hired for his depth of knowledge with C++ in high-performance environments. We find this type of engineer very hard to find and we appreciated the excellent technical skills Jesus brought to the business.

He is a polyglot engineer who was always open to working with different technologies... with a curious mindset to learn. We appreciated his openness... He was very easy to work with."

Engineering Manager

SEDDI (Former Employer)

Let's Work Together

If you're looking for expertise in high-performance C++ systems, scalable Python backends, let's talk.

[email protected]
linkedin.com/in/jesus-izquierdo-cubas
github.com/jesusizq

📍 Madrid, Spain (GMT+1) · 🇪🇺 EU Citizen · 🌍 Available for remote work globally

I typically respond within 24 hours.