SENIOR SOFTWARE ENGINEER · 14+ YEARS

Abel Sierra Sánchez

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01

About

14+ years building interactive experiences that push the boundary between the digital and physical world.

Specialising in VR, AR, and MR development, I've led teams, managed projects end-to-end, and worked directly with major international brands — Meta, Vodafone, PwC, SEAT, Sephora, H&M — delivering innovative, market-driven solutions.

I thrive in Agile/Scrum environments as both a hands-on technical lead and a collaborative team player. Currently working as a freelance senior developer on XR creative projects and interactive experiences.

14+ Years Experience
50+ Projects Delivered
8+ Teams Led
AS
Unity Unreal VR AR XR C# C++ Shaders
02

Experience

2026 — Now

Freelance Senior Developer

Self-employed · Remote

Currently working on different interactive experiences and an XR creative project, primarily as a Unity developer. Building experimental features in cutting-edge XR hardware.

UnityXRARMR
Jun 2025 – Apr 2026

Technical Lead

Nexus Studios · Remote

Led development of a sports streaming XR project for a major tech company in the XR field. Focused on live immersive broadcasting for Meta Quest 3.

KotlinAndroid StudioMeta Spatial SDKMeta Quest 3
Nov 2024 – Jun 2025

Freelance Senior Developer

Self-employed · Remote & On-site

Delivered multiple high-profile MR/AR projects: the world-first Mixed Reality rollercoaster Diablo Neo at PortAventura, a multiplayer MR sea-life experience at Oceanogràfic de Valencia, a web AR portal for STWD Milan, and a Snapchat filter for Eucerin.

UnityPico 4 UltraLens Studio8th WallMultiplayerComputer Vision
Apr 2023 – Oct 2024

Technical Lead

Unit9 · London, UK (Remote)

Worked with clients including Meta, leading mixed reality projects for Quest 3. Led First Encounters — the showcase MR experience for Meta Quest 3 launch — and a fully functional prototype for a horror movie MR experience. Led teams of up to 8 developers, designed software architecture, managed sprints, reviewed PRs.

UnityMeta Quest 3Mixed RealityTech LeadAgile
Jul 2022 – Mar 2023

Lead Metaverse Developer

Spatial Voyagers · Remote

Led a team of 5 developers building a platform for real-time custom Avatar generation and a node-based content integration system for a multiplayer metaverse experience — no programming required.

UnityMultiplayerAvatar SystemMetaverseScrum
Jul 2016 – Jul 2022

Senior Developer & Technical Lead

Virtual Voyagers / Wildbytes / Hand Coded / Multiple Agencies

Six years of high-output freelance and agency work: Vodafone 5G Reality metaverse platform, PwC UK supplier (VR training), SEAT VR Theater (48 synchronised GearVRs + motorised chairs at Paris/Frankfurt Motorshow), Sephora, H&M, Fenty Beauty, Paysage Sonore at Palais Augmenté Paris, and the VR adaptation of the BAFTA winning short film Do Not Feed The Pigeons, Midnight Story.

UnityVR/ARPhoton PUNShadersOpenCVKinectAndroid/iOS
Nov 2014 – Jun 2016

Core Engineer & Lead Developer

Neurodigital Technologies · Almería, Spain

Designed and developed the SDK and demo software for hardware haptic glove prototypes. Led a team of 4–6 developers, integrated Leap Motion, Intel RealSense, Kinect v2, Oculus Rift, HTC Vive, GearVR.

UnityC#Leap MotionRealSenseOculus RiftHTC Vive
03

Selected Works

★ FEATUREDMixed RealityMetaTechnical Lead

First Encounters
Meta Quest 3 Launch

Unit9 × Meta

The flagship Mixed Reality showcase experience shipped with the Meta Quest 3 launch. Led as Technical Lead — managing a team of 8, designing software architecture, directing sprint planning and delivery end-to-end.

UnityMeta Quest 3Mixed RealityC#
View Project
VRAutomotiveLive Event

SEAT VR Theater
Paris & Frankfurt Motorshow

Wildbytes × SEAT

Immersive VR experience and controller software for 48 GearVRs synchronised with 48 motorised chairs at the SEAT booth — Paris Motorshow 2016 and Frankfurt Motorshow 2017.

UnityGearVRAndroidReal-time Sync
Watch on Vimeo
Mixed RealityTheme Park

Diablo Neo

PortAventura World

World's first Mixed Reality rollercoaster. Blended experimental Pico 4 Ultra Enterprise features with computer vision and a multiplayer device monitoring system — all live on a real coaster.

UnityPico 4 UltraComputer VisionMultiplayer
Watch on YouTube
VRTelecom

Vodafone 5G Reality

Virtual Voyagers × Vodafone

Metaverse platform with multiplayer and multi-experience capabilities. Led development of a framework for adding XR content without programming.

UnityMultiplayerMetaverse5G
View on SideQuest
Mixed RealityMuseum

Oceanogràfic Valencia

Freelance

Multiplayer Mixed Reality experience at the Oceanogràfic de Valencia, allowing many visitors to share the same immersive sea-life environment simultaneously.

UnityMixed RealityMultiplayer
View Project
ARGenerative Art

Paysage Sonore

Hand Coded · Palais Augmenté, Paris

Artistic, generative, audio-reactive Augmented Reality experience exhibited at the Palais Augmenté in Paris. Lead developer and technical artist.

UnityARGenerative ArtAudio-reactive
View Project
VRFilmBAFTA

Midnight Story

National Film & Television School

VR short experience based on Do Not Feed The Pigeons, the stop-motion BAFTA Award winner (2022). Lead developer delivering a cinematic VR adaptation.

UnityVROculus Quest
View Project
VRTraining

In My Shoes

PwC UK

Empathy VR training experience for PricewaterhouseCoopers. Served as main developer and technical artist — custom shader development, visual design, and Oculus Quest optimisation.

UnityOculus QuestShadersPico VR
View on LinkedIn
04

Skills & Tech

Engines & Platforms

Unity3D Unity DOTS Unreal Lens Studio 8th Wall Android Studio

XR Hardware

Meta Quest Pico 4 Ultra HTC Vive Oculus Rift GearVR Cardboard OSVR

Languages

C# HLSL / GLSL Kotlin Java C++ JavaScript SwiftUI

Multiplayer & Networking

Photon PUN Photon Fusion Mirror Meta Spatial SDK

Sensing & Computer Vision

Kinect v2 Intel RealSense Leap Motion OpenCV Vuforia ARKit / ARCore

DevOps & Tooling

Jenkins CI/CD Azure Pipelines Jira / Confluence AWS / Azure ReactJS Node.js

Creative & Design

Blender Shader Development Technical Art Photoshop / GIMP Generative Art

Soft Skills

Team Leadership Agile / Scrum Client Management Architecture Design Mentoring Problem Solving

Languages

SpanishNative
ItalianProficient
EnglishProficient
FrenchIntermediate
05

Playground

VOID DRIFT — A Three.js micro-experience.
Move to survive. Click to pulse. Avoid the void shards.
Mobile: tap to pulse, tilt or touch-drag to move.

SCORE 0
SHIELDS
TIME 0:00

VOID DRIFT

Enter the Void

Move your cursor to navigate the plasma.
Click anywhere to send a pulse wave.
Survive as long as you can.