Fractional CTO
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Technology Leadership Without the Full-Time Price Tag
A full-time CTO costs $200,000 or more a year in salary alone — before equity, benefits, and a 3–6 month search. For startups, growing mid-size companies, and businesses in transition, that hire doesn’t fit the stage they’re at. A fractional CTO gives you the same strategic and technical ownership on a part-time or project basis, starting within two weeks instead of a quarter.
CimpleO provides fractional CTO engagements for companies that have real technical decisions to make and no one senior enough in-house to own them.
Fractional CTO for hardware and IoT startups
A hardware CTO owns decisions a software CTO does not face. A wrong call costs a board respin. We cover these:
- Chip and radio. MCU and radio selection: ESP32-class, STM32, BLE, LoRa, 4G.
- Power budget. Battery or mains, sleep modes, and what they do to the bill of materials.
- Firmware. Architecture, OTA updates, and a device-to-cloud protocol, including MQTT topic design.
- Manufacturing. PCB and manufacturing handoff, and the choice of vendors and contract manufacturer.
- Certification. The certification path and its dates.
- Make or buy. Custom board or off-the-shelf module.
We cover the cloud side of the same system, so the device and the backend get one owner. For the engineering team that builds it, see IoT development.
What a first 30 days looks like
- Technical due diligence of the current design: schematics, firmware, cloud protocol, and the BOM.
- A risk register for the hardware: what can force a respin, a delay or a failed certification.
- Build-or-buy decisions for modules, the cloud stack and the contract manufacturer.
- A roadmap tied to certification and manufacturing dates.
Budget certification before the board is frozen
Certification is the cost founders miss. Two public sources, both unverified by us:
- Particle (IoT FCC guide): FCC Subpart B costs about $3,000–$5,000. Subpart C costs $40,000 or more. FCC, PTCRB, OTA and carrier certifications together can reach $200,000 and take up to six to nine months.
- Hubble Network (IoT hardware cost breakdown): FCC $5,000–$30,000+, CE marking $10,000–$25,000+, carrier certification $15,000–$50,000+ and 2–6 months. Hubble calls certification “the single most underestimated cost category”.
Your numbers depend on the radio, the markets and the carriers. We put a range into the roadmap in week one, because a late change to the antenna or the radio module can mean testing again.
Hardware we have shipped
- Our own products. Machine Signals (industrial IoT monitoring): ESP32 firmware and custom boards, with 3,032 commits in the main cloud repository from 2019 to 2026. hscLink: LoRa mesh meters with LoRa node and gateway boards we designed. A standalone firmware programmer that flashes ESP32 with flash encryption.
- FlowID (client, named with permission): water-flow and TDS monitoring on ESP32-class devices, BLE and MQTT with PSK encryption, mobile apps and a dashboard. At least 3,518 engineering hours, 8 engineers, about 3 years.
- Micare GPS tracker (client, named with permission): hardware moved from 2G to 4G, deep sleep with accelerometer wake-up, MQTT with an ACL-protected broker, a USSD/SMS fallback and a factory assembly stage. At least 2,563 engineering hours, 3 hardware engineers.
These were engineering projects. They show the work behind the decisions above. None was a fractional CTO engagement.
Talk to us about your hardware roadmap
What You Get
Technology roadmap. A concrete plan connecting business goals to what to build, what to buy, and what to retire — with the reasoning documented so it survives a leadership transition.
Vendor and architecture decisions. Cloud platforms, dev tools, security vendors — evaluated by someone who has made these calls before and knows where the lock-in risk hides.
Engineering team development. Code review practices, hiring standards, on-call processes, and documentation habits that raise the capability of the team already in place.
Technical due diligence. Independent technical assessment for a fundraise or acquisition — the kind investors and acquirers actually check against.
CTO as a Service: Cost Breakdown
| Engagement model | Typical cost | What it covers |
|---|---|---|
| Hourly advisory | $300/hour | Architecture reviews, vendor evaluation, one-off technical decisions |
| Monthly retainer (1–2 days/week) | $5,000–$12,000/month | Ongoing technology ownership: roadmap, team, vendor and architecture decisions |
| Project engagement | From $30,000 | Technical due diligence for a fundraise or acquisition, replatforming plan, security audit oversight |
A full-time CTO runs $300,000+ a year fully loaded, plus a 3–6 month search. A $10,000/month retainer costs $120,000 a year and can start in two weeks.
Two things move the price within these ranges: scope of ownership (advising costs less than owning hiring, vendor contracts, and incident escalations) and stage/stack complexity (a single-product SaaS on one cloud is cheaper to lead than a company mid-migration with a compliance deadline).
Judge the engagement by owned outcomes, not hours billed — a roadmap that ships, a hire that closes, an audit that passes.
For the full breakdown of when this model fits and when it doesn’t, see Fractional CTO Services: Enterprise Tech Leadership.
Who This Is For
- Startups that need a technical co-founder-equivalent but aren’t ready for a full-time hire
- Companies scaling fast enough that engineering decisions have outpaced current leadership
- Businesses bridging an executive gap between a CTO departure and a permanent replacement
- Founders heading into a fundraise that requires technical due diligence
Start with a Technical Assessment
We review your current stack, team structure, and technical roadmap, then scope an engagement — hourly advisory, monthly retainer, or a fixed project — against what you actually need.
Frequently Asked Questions
How much does a fractional CTO cost?
Hourly advisory: $300/hour for architecture reviews, vendor evaluation, and one-off technical decisions. Monthly retainer (1–2 days/week): $5,000–$12,000/month for ongoing technology ownership. Project engagement: from $30,000 for technical due diligence, a replatforming plan, or security audit oversight. Compare that to a full-time CTO at $200,000+ in salary, plus equity and benefits. Fully loaded, that is $300,000/year or more.
What does a fractional CTO actually do?
They own your technology strategy the way a full-time CTO would: vendor decisions, architecture choices, team structure, technical roadmap — in a defined capacity of days per week or a fixed engagement scope, without full-time executive overhead.
When does a fractional CTO make sense instead of hiring full-time?
When you have real technical decisions to make and no one senior enough to own them, but not yet the budget or need for a full-time executive. If your problem is execution — a clear plan and not enough engineers — that's a hiring problem, not a leadership problem, and a fractional CTO won't fix it.
Can a fractional CTO help with fundraising or an acquisition?
Yes. Technical due diligence is one of the most common project engagements: an investor or acquirer wants an independent technical assessment before closing, and a fractional CTO who has been on both sides of that process knows what they're checking for.
How fast can a fractional CTO start, compared to hiring one full-time?
A retainer engagement can start within two weeks. A full-time CTO search typically takes 3–6 months plus a probation ramp-up. If you need technical leadership now — a launch, a fundraise, an infrastructure change — the fractional model is the faster path.
When should a hardware startup hire a fractional CTO instead of a firmware contractor?
Hire a firmware contractor when the design is frozen and you need code written. Hire a fractional CTO when the open questions come before the code: which MCU and radio, what the power budget allows, which modules to buy, which contract manufacturer to use, and when to start certification. A CTO makes those calls and owns the roadmap. A contractor builds what the roadmap says.
Can you review a hardware design made by another vendor?
Yes. Technical due diligence of an existing design is the first step of the 30-day plan: we read the schematics, firmware and cloud protocol, then list the risks and the decisions that still cost less to change now than after the board is frozen. We state what we could not check from the files.
How do you work with our contract manufacturer?
We take the technical side of the handoff on your behalf: what goes to the manufacturer, what they must test, and which questions need an engineering answer. We have worked through a factory assembly stage on the Micare GPS tracker. The contract and the commercial terms stay with you.