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Donatas Simkus, growth marketing and AI

A Growth Department of One

Most marketers use AI. I build growth systems with it.

10+ years of B2B growth across AI, SaaS, FinTech, and Crypto, now built into agents and automations that let a lean team run like a full growth and marketing department.

Donatas Simkus

I'm Donatas Simkus.

Ask my AI anything about my work

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The Work, in Numbers

A decade of B2B growth across AI, SaaS, FinTech, and Crypto.

$3.3B

IPO Campaign Led

Led the marketing campaign for Phoenix Group's $3.3B IPO; the offer closed 180x oversubscribed with retail investors.

180x

IPO Oversubscription

Phoenix Group's IPO saw 180x oversubscription from retail investors.

$138M+

Funding Supported

Part of growth through Series B and C funding rounds totalling $138M+ across multiple startups.

2,000+

Clients Onboarded

Onboarded 2,000+ global accountants in 12 months at Koinly through growth experimentation.

$2M+

ARR from ABM

Sourced 5 enterprise wins worth $2M+ in ARR through strategic ABM program at parcelLab.

The story behind the numbers

The case studies, the full career record, and how I work.

Where I've driven growth

What People Say

From the founders, CMOs, and operators I've worked with.

Read all 50+ recommendations
AI summary synthesized from every recommendation

AI-synthesized from all 50+ LinkedIn recommendations, 2018 to 2026. Three themes repeat across a decade, five companies, and every seniority level:

  1. 1. Builds fast, especially with AI.

    "Sophisticated AI automations, workflows, and systems faster than I thought possible" (Nico Fernando). "Robust, AI-driven pipelines... one of the most impressive growth plans I've seen" (Raj Vaswani).

  2. 2. Connects the technical and the commercial.

    "Thinks holistically about product, market, and business, not marketing in isolation" (Raj Vaswani). "Connect technical details with broader business goals" (Muhammad Rehan).

  3. 3. A low-ego leader people learn from.

    "Low ego, very thoughtful and a pleasure to lead" (Sachin Pabari, who hired him). "Empowering them to make decisions and grow... always gave credit where credit was due" (Juan Sanz).

"Donatas is one of those rare people who defies a job title. Calling him a marketer doesn't come close to describing what he brings to the table. His knowledge spans far beyond marketing, but what impresses me most is his ability to build. While he may not call himself an engineer, I've seen him create incredibly sophisticated AI automations, workflows, and systems faster than I thought possible. On top of that, he's collaborative, generous with his time, and someone every cross-functional team wants to work with. Any organization would be lucky to have him."

Nico Fernando

Product Marketing Leader | Driving Adoption, Revenue, and GTM for AI Products

"I had the pleasure of working closely with Donatas on a complex construction AI platform, and he is one of the sharpest growth and marketing professionals I've worked with. His ability to quickly grasp deep-tech products across industries and translate them into clear, effective GTM strategies is exceptional. Donatas thinks holistically about product, market, and business, not marketing in isolation. He brings strong strategic clarity, moves fast, and consistently adds value beyond his scope. His ability to build robust, AI-driven pipelines for lead generation and awareness was one of the most impressive growth plans I've seen. Any team would benefit from having him lead growth and marketing initiatives."

Ar. Raj Vaswani

AI Product @AI71 | Building the intelligence layer of the Construction Lifecycle

"I didn't have the opportunity to work with Donatas for long, but even in a short span, his impact was unmistakable. He brought a rare combination of strategic clarity and executional precision to every conversation, distilling complex growth challenges into clear, actionable priorities. His knowledge of B2B SaaS, AI, and crypto is matched by a deep understanding of GTM strategy and data-driven marketing. Donatas doesn't just talk growth, he builds it, scales it, and optimizes it with a calm confidence that sets him apart. A real asset to any team or venture lucky enough to have him onboard."

Cathal Burke

Director of Communications and Marketing, VARA

"Donatas is a talented and ambitious Growth Marketer and an invaluable member of any team. He has the ability to fine-tune a campaign to perfection. He is an intelligent, results driven professional who really takes ownership of any project that comes his way. His work ethic is second to none and he is an absolute pleasure to work with."

Sarah Aird-Mash

CMO | GTM Transformation, Brand Repositioning & Demand Generation Leader

"I had the pleasure of working with Donatas for nearly 3 years at parcelLab. Donatas, or Donni as we fondly call him, has truly developed into an exceptional growth hacker, thanks to his relentless drive and passion for the industry. When Donni first joined parcelLab, he demonstrated an insatiable curiosity for all things growth. He dove headfirst into various projects and was never afraid to experiment, which allowed him to gain hands-on experience in different aspects of growth. During his time at parcelLab, I have seen Donni grow in his role as the Head of Growth. He has developed a deep understanding of growth marketing and has become an expert in using data-driven strategies to achieve desired outcomes. He consistently pushes the boundaries of what is possible and identifies new opportunities to drive growth."

Anton Eder

Turning post-purchase into profit | COO

"Donatas was one of my first few hires at Koinly to build the B2B Growth Team. Donatas is a great manager and team player but most importantly an awesome executor. What I was particularly impressed with whilst working with Donatas, is alongside the ideation was structure and reporting. The Growth experiments were executed flawlessly and the reporting on the success/learnings of these experiments was superb. This allowed us to iterate super fast and really deliver on our objectives or course correct. He has incredible 360 knowledge on Growth and Marketing and became a resource to many on the B2B and B2C side for new initiatives. On top of all of this, he is low ego, very thoughtful and a pleasure to lead."

Sachin Pabari

Fractional GTM Lead @Connectd | Ex-VP Commercial & Ops @Koinly | 2x Founder

"Donatas is one of those rare people who defies a job title. Calling him a marketer doesn't come close to describing what he brings to the table. His knowledge spans far beyond marketing, but what impresses me most is his ability to build. While he may not call himself an engineer, I've seen him create incredibly sophisticated AI automations, workflows, and systems faster than I thought possible. On top of that, he's collaborative, generous with his time, and someone every cross-functional team wants to work with. Any organization would be lucky to have him."

Nico Fernando

Product Marketing Leader | Driving Adoption, Revenue, and GTM for AI Products

"I had the pleasure of working closely with Donatas on a complex construction AI platform, and he is one of the sharpest growth and marketing professionals I've worked with. His ability to quickly grasp deep-tech products across industries and translate them into clear, effective GTM strategies is exceptional. Donatas thinks holistically about product, market, and business, not marketing in isolation. He brings strong strategic clarity, moves fast, and consistently adds value beyond his scope. His ability to build robust, AI-driven pipelines for lead generation and awareness was one of the most impressive growth plans I've seen. Any team would benefit from having him lead growth and marketing initiatives."

Ar. Raj Vaswani

AI Product @AI71 | Building the intelligence layer of the Construction Lifecycle

"I didn't have the opportunity to work with Donatas for long, but even in a short span, his impact was unmistakable. He brought a rare combination of strategic clarity and executional precision to every conversation, distilling complex growth challenges into clear, actionable priorities. His knowledge of B2B SaaS, AI, and crypto is matched by a deep understanding of GTM strategy and data-driven marketing. Donatas doesn't just talk growth, he builds it, scales it, and optimizes it with a calm confidence that sets him apart. A real asset to any team or venture lucky enough to have him onboard."

Cathal Burke

Director of Communications and Marketing, VARA

"Donatas is a talented and ambitious Growth Marketer and an invaluable member of any team. He has the ability to fine-tune a campaign to perfection. He is an intelligent, results driven professional who really takes ownership of any project that comes his way. His work ethic is second to none and he is an absolute pleasure to work with."

Sarah Aird-Mash

CMO | GTM Transformation, Brand Repositioning & Demand Generation Leader

"I had the pleasure of working with Donatas for nearly 3 years at parcelLab. Donatas, or Donni as we fondly call him, has truly developed into an exceptional growth hacker, thanks to his relentless drive and passion for the industry. When Donni first joined parcelLab, he demonstrated an insatiable curiosity for all things growth. He dove headfirst into various projects and was never afraid to experiment, which allowed him to gain hands-on experience in different aspects of growth. During his time at parcelLab, I have seen Donni grow in his role as the Head of Growth. He has developed a deep understanding of growth marketing and has become an expert in using data-driven strategies to achieve desired outcomes. He consistently pushes the boundaries of what is possible and identifies new opportunities to drive growth."

Anton Eder

Turning post-purchase into profit | COO

"Donatas was one of my first few hires at Koinly to build the B2B Growth Team. Donatas is a great manager and team player but most importantly an awesome executor. What I was particularly impressed with whilst working with Donatas, is alongside the ideation was structure and reporting. The Growth experiments were executed flawlessly and the reporting on the success/learnings of these experiments was superb. This allowed us to iterate super fast and really deliver on our objectives or course correct. He has incredible 360 knowledge on Growth and Marketing and became a resource to many on the B2B and B2C side for new initiatives. On top of all of this, he is low ego, very thoughtful and a pleasure to lead."

Sachin Pabari

Fractional GTM Lead @Connectd | Ex-VP Commercial & Ops @Koinly | 2x Founder

"Donatas is one of those rare people who defies a job title. Calling him a marketer doesn't come close to describing what he brings to the table. His knowledge spans far beyond marketing, but what impresses me most is his ability to build. While he may not call himself an engineer, I've seen him create incredibly sophisticated AI automations, workflows, and systems faster than I thought possible. On top of that, he's collaborative, generous with his time, and someone every cross-functional team wants to work with. Any organization would be lucky to have him."

Nico Fernando

Product Marketing Leader | Driving Adoption, Revenue, and GTM for AI Products

"I had the pleasure of working closely with Donatas on a complex construction AI platform, and he is one of the sharpest growth and marketing professionals I've worked with. His ability to quickly grasp deep-tech products across industries and translate them into clear, effective GTM strategies is exceptional. Donatas thinks holistically about product, market, and business, not marketing in isolation. He brings strong strategic clarity, moves fast, and consistently adds value beyond his scope. His ability to build robust, AI-driven pipelines for lead generation and awareness was one of the most impressive growth plans I've seen. Any team would benefit from having him lead growth and marketing initiatives."

Ar. Raj Vaswani

AI Product @AI71 | Building the intelligence layer of the Construction Lifecycle

"I didn't have the opportunity to work with Donatas for long, but even in a short span, his impact was unmistakable. He brought a rare combination of strategic clarity and executional precision to every conversation, distilling complex growth challenges into clear, actionable priorities. His knowledge of B2B SaaS, AI, and crypto is matched by a deep understanding of GTM strategy and data-driven marketing. Donatas doesn't just talk growth, he builds it, scales it, and optimizes it with a calm confidence that sets him apart. A real asset to any team or venture lucky enough to have him onboard."

Cathal Burke

Director of Communications and Marketing, VARA

"Donatas is a talented and ambitious Growth Marketer and an invaluable member of any team. He has the ability to fine-tune a campaign to perfection. He is an intelligent, results driven professional who really takes ownership of any project that comes his way. His work ethic is second to none and he is an absolute pleasure to work with."

Sarah Aird-Mash

CMO | GTM Transformation, Brand Repositioning & Demand Generation Leader

"I had the pleasure of working with Donatas for nearly 3 years at parcelLab. Donatas, or Donni as we fondly call him, has truly developed into an exceptional growth hacker, thanks to his relentless drive and passion for the industry. When Donni first joined parcelLab, he demonstrated an insatiable curiosity for all things growth. He dove headfirst into various projects and was never afraid to experiment, which allowed him to gain hands-on experience in different aspects of growth. During his time at parcelLab, I have seen Donni grow in his role as the Head of Growth. He has developed a deep understanding of growth marketing and has become an expert in using data-driven strategies to achieve desired outcomes. He consistently pushes the boundaries of what is possible and identifies new opportunities to drive growth."

Anton Eder

Turning post-purchase into profit | COO

"Donatas was one of my first few hires at Koinly to build the B2B Growth Team. Donatas is a great manager and team player but most importantly an awesome executor. What I was particularly impressed with whilst working with Donatas, is alongside the ideation was structure and reporting. The Growth experiments were executed flawlessly and the reporting on the success/learnings of these experiments was superb. This allowed us to iterate super fast and really deliver on our objectives or course correct. He has incredible 360 knowledge on Growth and Marketing and became a resource to many on the B2B and B2C side for new initiatives. On top of all of this, he is low ego, very thoughtful and a pleasure to lead."

Sachin Pabari

Fractional GTM Lead @Connectd | Ex-VP Commercial & Ops @Koinly | 2x Founder

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