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Fractional CTO / CTOaaS

Senior technology leadership, without the full-time seat.

An independent, bilingual technology executive who joins where the decisions are made: architecture, roadmap, hiring, and the story you tell your board. Your team builds. You get senior judgment where it counts.

Three tiers8 to 60 hours a month
BilingualEnglish and Spanish, for distributed LatAm teams
IndependentNo resale, no vendor commissions
Minimum termOne quarter
What it is

Judgment on the calls that are expensive to get wrong

A handful of decisions a year set the direction of the whole stack: the architecture, the hire, the vendor, the story for your next raise. That is where fractional coverage concentrates.

Where it covers

  • Technical strategy and roadmap prioritization
  • Architecture and stack decisions
  • Hiring and evaluating engineering leadership
  • Vendor, cloud, and tooling decisions
  • Board and investor technical narrative
  • Oversight of distributed engineering teams and vendors, in English or Spanish

The right scope

Reviews, questions, and sets direction on what's critical: architecture, roadmap, hiring, spend. Day-to-day building stays with your team. When a stretch needs closer involvement, coverage scales up for that period, without becoming a permanent seat.

A monthly hour cap keeps the focus sharp and the engagement sustainable.
Who you work with

One senior advisor, not a rotating team

Walter Serrano, Founding Partner of Seranta
Walter Serrano
Founding Partner, Seranta

Sixteen years leading technology in regulated industries (financial services, insurance, and healthcare) across Colombia and the United States. Enterprise architecture, critical systems, and the contracts behind them. Bilingual, and used to reporting to a board.

Typical scenarios

Where fractional coverage moves the needle most

Concrete situations where an independent, senior technical read changes the outcome of the decision.

Fundraise readiness

Technical narrative and architecture readiness before investor diligence, without waiting for a full-time hire.

Interim leadership during a CTO search

Continuity for the team and the roadmap while you hire a permanent technical leader.

Platform and architecture decisions

The build, buy, or replatform call, reviewed before it becomes expensive to undo.

Building the founding engineering team

Hiring plan, interview process, and the first technical leads, set up before the team scales.

Security and compliance readiness

SOC 2, HIPAA, or a customer's security questionnaire, prepared with the right priorities.

Distributed team & vendor oversight

Direct, senior oversight for engineering teams, vendors, or customers based in Latin America, in Spanish or English.

The tiers

Three tiers, based on the depth you need

The tier is set by monthly hours and how much oversight it includes. We start with the decision closest to you.

Advisory

4 to 8 hper month, about 2 a week
For a monthly technical review and a second opinion on the calls that matter.
  • Monthly strategy session
  • Written recommendation on one open decision
  • Async access for questions
  • Read-only review of your technical documentation
Best fit for most

Fractional CTO

16 to 24 hper month, about 5 a week
For ongoing coverage of your technology roadmap and team.
  • Everything in Advisory
  • Weekly working session with engineering leadership
  • Oversight of one or two active initiatives (architecture, hiring, vendor decisions)
  • Board-ready technical updates
  • Available for investor and customer technical conversations

Embedded

Up to 60 hper month, about 14 a week
Around 14 hours a week, for a defined stretch: interim leadership, a fundraise, or a critical migration. One engagement at a time.
  • Everything in Fractional CTO
  • Extended availability during the defined stretch
  • Direct involvement in hiring and vendor negotiations
  • Priority response time

Minimum term of one quarter. The tier adjusts as your stage changes. Embedded runs one engagement at a time.

How it starts

From the first conversation to ongoing coverage

FIRST

Context session

We map your priorities for the next two quarters and agree on what's covered.

SECOND

Tier agreed

Monthly hours and oversight set for your stage, with a clear cap.

THIRD

Working rhythm

Weekly session, written recommendations, a position on every major call.

FOURTH

Evolution

Coverage scales with your stage, from Advisory to Fractional to Embedded.

Why Seranta

An advisor without conflicts of interest

Seranta does not resell technology, does not implement, and does not take vendor commissions. Sixteen years of technology leadership in regulated industries back every recommendation.

Let's talk about the decision ahead of you

Thirty minutes is enough to find the right tier and scope.