Fractional CTO
Ongoing technical leadership without a full-time executive hire. I turn product ambition into a clear technical plan and help your team deliver it.
- Technology strategy
- Engineering leadership
- Founder and board support
Fractional CTO for ambitious SaaS teams
Good questions.
Better systems.
Senior technical leadership for founders who need to scale the product, strengthen the team, and make the next big decision with confidence.
Guillermo Quiros / Technology leadership
GQ / 01
Your team has IQ and EQ.
Your product needs GQ.
Experience behind products and platforms used by
MGM RESORTSROYAL CARIBBEANCARNIVALLOBUSCOACHSAFELYK8STUDIOUXXU
The inflection point
You don't need more code.
You need technical direction.
The architecture that got you here is starting to slow you down. Delivery is less predictable. Infrastructure costs keep climbing. Every technical decision seems to create three more.
That is not a developer problem. It is a leadership problem—and it is exactly where a fractional CTO creates leverage.
Roadmap vs. realityScaling architectureTeam structureCloud cost + reliabilityAI without the hype
How I help
Clarity at the level
your business needs.
Flexible senior leadership, shaped around the decision or transition in front of you.
Architecture intensive
A focused engagement for a high-stakes decision: scaling, cloud migration, platform redesign, AI integration, or technical due diligence.
- Current-state assessment
- Decision record and target design
- Practical delivery roadmap
Engineering health check
An independent view of what is slowing the team down, where risk is accumulating, and what deserves attention now—not someday.
- Team and delivery review
- Risk and reliability map
- 90-day action plan
Selected work
Built in the real world,
not on a whiteboard.
Client platforms and founder-built products—because technical strategy matters when it survives customers, budgets, and production.
01
Founder-built products
Founder, product & technology lead
Turning Kubernetes complexity into an agent-free desktop product.
Conceived and built a local-first Kubernetes IDE that combines multi-cluster operations, CloudMaps, security workflows, RBAC, Helm, observability, and an AI copilot—without installing agents or sending cluster data to a vendor control plane.
8,000+engineers using K8Studio
Visit K8Studio Founder & product architect
Making software architecture living, connected, and usable by AI.
Built a collaborative C4 platform where systems, containers, components, and dependencies form one navigable model. UxxU adds architecture analytics, embeddable diagrams, MCP-driven AI workflows, and code-to-C4 generation.
Visit UxxU02
Client & partner platforms
Advisor & Chief Solution Architect
Technical leadership for a multi-tenant SaaS platform built to scale.
Architecture, hands-on delivery, and team guidance across scalability, security, performance, data aggregation, and cloud strategy.
Technical partnership
Cloud and product foundations for a mission that cannot compromise on trust.
Supporting the evolution of a safety-focused training platform with pragmatic cloud architecture, protected video delivery, and product-minded technical execution.
CoachSafely reports 70,000+ courses taken and 1M+ youth athletes protected across its program.
The first 30 days
Listen. Map.
Move.
No six-month discovery phase. We create shared clarity quickly, then turn it into visible progress.
Listen
Founder goals, product reality, team dynamics, and the decisions that cannot wait.
Map
A candid picture of the system, risks, opportunities, and the few priorities that matter most.
Move
Owners, decisions, and a practical roadmap—plus hands-on help where it unlocks momentum.
The person behind GQ
I've spent 20+ years turning technical complexity into business momentum.
I'm Guillermo Quiros—a technology executive, architect, and product builder. I've led engineering organizations of 40+ people across the US, Europe, Australia, and New Zealand.
I work comfortably from board-level strategy to production architecture. That range matters: the best technical decision is the one your team can actually deliver and your business can sustain.
20+Years building
40+People led
4Regions worked
Good questions / field notes
Thinking in public.
AI + Architecture01
C4 Models Are Brilliant. AI Coding Is Breaking Them.
Why architecture needs a living connection to the code AI is changing.
Read on MediumPlatform judgment02
Think Twice Before Installing Agents in Kubernetes
The hidden operational tradeoffs behind convenient infrastructure tooling.
Read on MediumCloud security03
Private EKS with Cloudflare Zero Trust WARP
A practical approach to private, secure access without operational drag.
Read on MediumA few good questions
Before we talk.
When is a fractional CTO the right move?+
When technical decisions are shaping growth, but a full-time executive hire is premature, too slow, or not yet justified.
Do you work with the existing team?+
Yes. The goal is to make your team stronger and more effective—not to arrive with a replacement crew.
Are you strategic or hands-on?+
Both. I can support a board decision, review architecture, coach leaders, and work directly with engineers when that is the fastest path to clarity.
Where do you work?+
I'm based in Spain and work remotely with US and European teams, with working hours designed around the engagement.
One good conversation can change the roadmap
What is the hard question
your team is avoiding?
Let's talk for 30 minutes No pitch deck. No obligation. Just a useful conversation.