
Kristyn Castello
KHR Executive AdvisoryEmployment attorney and SHRM-certified executive. Built People functions three times from zero, most recently scaling a health tech company from 50 to 150 people through its IPO.
Partners & Providers
Certified People and Talent leaders who have built the function before, know your stage, and already know the system, plus a short list of vetted specialists for the work that sits outside it. You engage them directly, on their terms.
Certified Fractional Partners · People and Talent
Contact them directly. You set the scope and the rate with them, and Nu|Erraa takes no cut.

Employment attorney and SHRM-certified executive. Built People functions three times from zero, most recently scaling a health tech company from 50 to 150 people through its IPO.

Two decades building People and Talent from the ground up, 30 to 600 people, pre-seed through Series C, across continents.

People and Talent leader who partners directly with founders to turn business goals into practical people strategies, from defining the first hires and building recruiting processes to shaping teams and coaching leaders. 15+ years across startups and high-growth tech, with experience at Google, Apple and NVIDIA.

People leader with 15+ years supporting early- to mid-stage global startups, 30 to 550 people. Builds infrastructure for startups and small businesses using an AI-layered approach, so owners can focus on growth rather than operational details.

Early-stage HR builder with 20+ years turning founders’ visions into working People functions. Has built the function from scratch multiple times at founder-led companies across tech, media, professional services and wellness. ICF-certified executive coach who develops the managers a growing company depends on.

Often the first HR hire in the building. Has run the whole People function, from talent acquisition to culture, benefits and compliance, and scaled teams across India, Singapore, the EU, the UK and Canada for FinTech, AI, SaaS, consumer and gaming companies.

HR and organizational development leader who has been an HR Business Partner, a Director of Organizational Development and a Head of People. A three-time founder himself, which shapes how he reads a people problem. MBA, University of Louisiana at Lafayette.

Helps founders build the People side before it becomes a bottleneck. A decade leading People and Talent for companies from 13 to 1,500 people, and 15 or more M&A transactions.

Over a decade building and leading People functions at every stage of growth. Tripled headcount while building the function at an early stage tech company, and built the rewards and onboarding systems that took a bootstrapped services firm from 150 to 750 people and an exit. Experienced with complex M&A integrations.
Trusted providers · Beyond People and Talent
Some of what a growing company needs isn't People work. For that, we point you to providers we've vetted and would hire ourselves. You work with them directly.
Venturous Counsel is a mission-driven law firm providing fractional general counsel to women-founded, diverse-led and mission-driven startups and investors. Aravinda and her team give practical, strategic legal support from formation through fundraising and exit, including corporate, commercial and employment matters.
A Stanford Law graduate with more than 20 years supporting startups like Uber, Lyft, Airalo and TaskRabbit (all the way through acquisition) and investors like Felicis, Floodgate, Hustle Fund and Rakuten. Her team takes care of your legal needs so you can focus on the better stuff.
Email aravinda@venturouscounsel.com with a little context about what you need. Nu|Erraa is not a law firm and does not provide legal advice.
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Everyone above lists their own email, site and calendar. Contact whoever fits, and set the scope and the rate with them. If you would rather see the product first, book time with us.