Trusted by
Coursedog ($90M raised)
Product design that converts users and convinces investors
I help ambitious founders transform early-stage products into fundable experiences that drive activation and retention.
Partnered with 40+ startups across AI, Ed-Tech, Healthcare, Consulting and SaaS
Trusted by
Coursedog ($90M raised)
Product design that converts users and convinces investors
I help ambitious founders transform early-stage products into fundable experiences that drive activation and retention.
Partnered with 40+ startups across AI, Ed-Tech, Healthcare, Consulting and SaaS
Trusted by
Coursedog ($90M raised)
Product design that converts users and convinces investors
I help ambitious founders transform early-stage products into fundable experiences that drive activation and retention.
Partnered with 40+ startups across AI, Ed-Tech, Healthcare, Consulting and SaaS
"In 3 weeks, Designfellow turned my rough idea into an MVP I could confidently demo at conferences and pitch to investors."
I came to Marty with just a concept for an AI PCBA component analysis tool. He helped shape key features like carbon footprint estimation, then delivered a full design with flows that feel natural for end users – ready to hand off to my dev team. Now we're building it and raising our seed.
I came to Marty with just a concept for an AI PCBA component analysis tool. He helped shape key features like carbon footprint estimation, then delivered a full design with flows that feel natural for end users – ready to hand off to my dev team. Now we're building it and raising our seed.
Tomasz Rola
Founder
ro.lab Consulting
AI • Ed-tech
AI • AI Operations
AI • Health-tech
Landing Page • Sports
Web App • Health-care
The Problem
Bad UX is killing your traction.
Your landing page gets traffic but no signups. Users register, then ghost before seeing value. Your interface looks rushed. Your messaging tries to say everything and lands nowhere.
You've rewritten copy. Shipped features. Tweaked flows. Nothing moves the needle.
Every investor demo ends the same: "Interesting concept. We'll circle back."
Then silence.
Meanwhile, you're burning runway while competitors with worse tech but better design are closing deals.
The product works. But it doesn't look like something investors want to bet on.
Bad UX is killing your traction.
Your landing page gets traffic but no signups. Users register, then ghost before seeing value. Your interface looks rushed. Your messaging tries to say everything and lands nowhere.
You've rewritten copy. Shipped features. Tweaked flows. Nothing moves the needle.
Every investor demo ends the same: "Interesting concept. We'll circle back."
Then silence.
Meanwhile, you're burning runway while competitors with worse tech but better design are closing deals.
The product works. But it doesn't look like something investors want to bet on.
From early MVP to $10M+ in revenue
"Marty at Designfellow was an outstanding designer - taking the business from the early MVP stage to tens of millions of revenue.
Any company would be lucky to work with such a dedicated & strong designer."
Justin Wenig
Founder & CEO
Starbridge.ai
From early MVP to $10M+ in revenue
Marty at Designfellow was an outstanding designer - taking the business from the early MVP stage to tens of millions of revenue. Any company would be lucky to work with such a dedicated & strong designer.
Justin Wenig
Founder & CEO
Starbridge.ai
From early MVP to $10M+ in revenue
"Marty at Designfellow was an outstanding designer - taking the business from the early MVP stage to tens of millions of revenue.
Any company would be lucky to work with such a dedicated & strong designer."
Justin Wenig
Founder & CEO
Starbridge.ai
Results That Matter
Designfellow has helped 40+ companies grow faster
Real startups. Real growth. Real funding.
Results That Matter
Designfellow has helped 40+ companies grow faster
Real startups. Real growth. Real funding.
Results That Matter
Designfellow has helped 40+ companies grow faster
Real startups. Real growth. Real funding.
AI • Ed-tech
$17.2M Series A
$17.2M Series A
From MVP to $90M raised and 300+ universities won
From MVP to $90M raised and 300+ universities won
I helped Coursedog transform their early MVP into an industry-leading Academic Operations platform. Through a lean approach, end-to-end product design, and continuous research and iteration over 3 years, my work contributed to their growth to 300+ US Education Institutions (including Columbia, Stanford, CUNY, and BYU) serving 2.5M+ students, tens of millions in revenue, and raised $90M from JMI Equity.
"Marty consistently demonstrated ownership and initiative that directly influenced product direction. His ability to balance deep research with practical design execution helped us deliver more intuitive, accessible, and user-centered products across a broad portfolio."
"Marty consistently demonstrated ownership and initiative that directly influenced product direction. His ability to balance deep research with practical design execution helped us deliver more intuitive, accessible, and user-centered products across a broad portfolio."
Claire Genre
SVP of Product at Coursedog
Serving 300+ US Campuses including Columbia, Stanford, CUNY, and BYU
Optimization • Healthcare
$1B+ valuation
$1B+ valuation
Flow handling 687K daily bookings across 13 countries - live for years
Flow handling 687K daily bookings across 13 countries - live for years
I redesigned Docplanner's core patient booking flow – the critical conversion point for the world's largest healthcare platform. My high-converting, scalable design now processes 687K+ bookings daily across 13 countries, offloading 260K+ doctors from manual appointment management while ensuring complete patient information reaches providers before every visit.
"Marty designed one of the most important parts of product – the patient booking flow. That flow has been live for years now, which shows how solid and well-thought-out his work was."
"Marty designed one of the most important parts of product – the patient booking flow. That flow has been live for years now, which shows how solid and well-thought-out his work was."
Dawid Liberadzki
Principal Product Designer at Docplanner
Leading global SaaS healthcare platform
AI • Mobile App
MAIDEN LABS
MAIDEN LABS
MAIDEN LABS
4.8 rating
4.8 rating in App Store
•
5K+ app downloads
From 0 to 5K+ downloads in 6 weeks - ready to raise
From 0 to 5K+ downloads in 6 weeks - ready to raise
Working through tight feedback loops with the founder, I designed the complete mobile UX – from onboarding to core learning flows – in just 6 weeks. The founder's team handled development and shipped it to the App Store on schedule, positioning the company to raise their next round with a working product in market.
"Marty at Designfellow is one of the most talented designers I've worked with in the mobile app space. He has an extremely positive attitude and always delivers what is needed at each stage of development."
"Marty at Designfellow is one of the most talented designers I've worked with in the mobile app space. He has an extremely positive attitude and always delivers what is needed at each stage of development."
Michael Sun
Founder & CEO at Maiden Labs
Mobile & Web apps studio
Why Designfellow
I focus on what brings you results
Your roadmap won't wait. Neither do I. Here's what sets me apart
Why Designfellow
I focus on what brings you results
Your roadmap won't wait. Neither do I. Here's what sets me apart
Why Designfellow
I focus on what brings you results
Your roadmap won't wait. Neither do I. Here's what sets me apart
Investor-Grade Design
Investor-Grade Design
Investor-Grade Design
I've designed for companies that raised $100M+ and serve 687K users daily. You get the same quality that helped them close deals.
Conversion-Focused
Conversion-Focused
Conversion-Focused
Every flow optimized for activation and retention – the metrics investors actually ask about. Pretty screens that don't convert are expensive decoration.
Startup-Proven
Startup-Proven
Startup-Proven
10 years, 52 projects from MVP to Series A. I know which design decisions matter at your stage and which are premature optimization.
MVP to Series A experience across multiple industries. We know what investors expect and drives growth.
I own design, you own growth
I own design, you own growth
I own design, you own growth
Full ownership from strategy to dev-ready files. You focus on closing deals, hiring, and fundraising.
I Ship in Weeks, Not Months
I Ship in Weeks, Not Months
I Ship in Weeks, Not Months
Landing pages in 5-7 days. MVPs in 2-6 weeks. Fast enough to hit your next investor demo with something real.
Pause or cancel anytime
Pause or cancel anytime
Pause or cancel anytime
Month-to-month, no contracts. Runway tight? Pause. Raised? Resume. I work with startups – I get it.
How It Works
A proven process that ships fast and fuels growth
Clear steps. Fast execution. Real results.
How It Works
A proven process that ships fast and fuels growth
Clear steps. Fast execution. Real results.
How It Works
A proven process that ships fast and fuels growth
Clear steps. Fast execution. Real results.
I start with a focused call to understand your product vision, target users, biggest challenges, and timeline.
I'll discuss what's not working – whether it's user churn, low conversion, or investor skepticism – and map out the high-impact areas that will move your metrics.
Outcome
By the end, you'll have a clear action plan, defined scope, and know exactly what happens next.
Within 24 hours, you get access to your dedicated Slack channel, live Figma workspace, and Trello board tracking every task. I start delivering – first design concepts land within 48 hours of kickoff.
From there, I share daily updates through Slack and Loom walkthroughs explaining our design decisions. You drop feedback on your schedule, and I iterate continuously until you're completely satisfied.
Timeline estimations
- Landing pages: 5-7 days - Core flows: 10-15 days - Full MVPs: 2-6 weeks
Your commitment
2-3 hours per week reviewing designs. I handle everything else.
You walk away with a product you're proud to demo. One that converts users and impresses investors. Every flow is optimized, every detail is polished, and everything is launch-ready with full documentation – so your dev team can build with confidence and ship fast.
What you receive
- Dev-ready Figma files with detailed specs - Complete design system built for scalability - AI-compatible style guides for on-brand assets - Full documentation covering flows and implementation
Before Launch
I review your dev build and flag issues before users see them.
After Launch
Available for iterations based on user feedback and analytics. Your product keeps improving as you scale.
I start with a focused call to understand your product vision, target users, biggest challenges, and timeline.
I'll discuss what's not working – whether it's user churn, low conversion, or investor skepticism – and map out the high-impact areas that will move your metrics.
Outcome
By the end, you'll have a clear action plan, defined scope, and know exactly what happens next.
Within 24 hours, you get access to your dedicated Slack channel, live Figma workspace, and Trello board tracking every task. I start delivering – first design concepts land within 48 hours of kickoff.
From there, I share daily updates through Slack and Loom walkthroughs explaining our design decisions. You drop feedback on your schedule, and I iterate continuously until you're completely satisfied.
Timeline estimations
- Landing pages: 5-7 days - Core flows: 10-15 days - Full MVPs: 2-6 weeks
Your commitment
2-3 hours per week reviewing designs. I handle everything else.
You walk away with a product you're proud to demo. One that converts users and impresses investors. Every flow is optimized, every detail is polished, and everything is launch-ready with full documentation – so your dev team can build with confidence and ship fast.
What you receive
- Dev-ready Figma files with detailed specs - Complete design system built for scalability - AI-compatible style guides for on-brand assets - Full documentation covering flows and implementation
Before Launch
I review your dev build and flag issues before users see them.
After Launch
Available for iterations based on user feedback and analytics. Your product keeps improving as you scale.
I start with a focused call to understand your product vision, target users, biggest challenges, and timeline.
I'll discuss what's not working – whether it's user churn, low conversion, or investor skepticism – and map out the high-impact areas that will move your metrics.
Outcome
By the end, you'll have a clear action plan, defined scope, and know exactly what happens next.
Within 24 hours, you get access to your dedicated Slack channel, live Figma workspace, and Trello board tracking every task. I start delivering – first design concepts land within 48 hours of kickoff.
From there, I share daily updates through Slack and Loom walkthroughs explaining our design decisions. You drop feedback on your schedule, and I iterate continuously until you're completely satisfied.
Timeline estimations
- Landing pages: 5-7 days - Core flows: 10-15 days - Full MVPs: 2-6 weeks
Your commitment
2-3 hours per week reviewing designs. I handle everything else.
You walk away with a product you're proud to demo. One that converts users and impresses investors. Every flow is optimized, every detail is polished, and everything is launch-ready with full documentation – so your dev team can build with confidence and ship fast.
What you receive
- Dev-ready Figma files with detailed specs - Complete design system built for scalability - AI-compatible style guides for on-brand assets - Full documentation covering flows and implementation
Before Launch
I review your dev build and flag issues before users see them.
After Launch
Available for iterations based on user feedback and analytics. Your product keeps improving as you scale.
App redesign that raised retention from 15% to 35%
"Marty designed our app with great attention to detail, delivering a solid and creative design. But above all, he was extremely responsive, always quick to reply, adapt, and move things forward. A pleasure to work with!"
"Marty designed our app with great attention to detail, delivering a solid and creative design. But above all, he was extremely responsive, always quick to reply, adapt, and move things forward. A pleasure to work with!"
Marc Allain
Founder at Prism Studio
Mobile apps studio for top creators
Founder at Prism Studio
Top mobile apps studio for creators
Founder at Prism Studio
Mobile apps studio for top creators
Ready to move forward?
Ready to move forward?
Ready to move forward?
Book a free 30 min call and I'll show you exactly what's holding back your conversion and growth – and how to fix it in 2-6 weeks. Whether we work together or not.
Book a free 30 min call and I'll show you exactly what's holding back your conversion and growth – and how to fix it in 2-6 weeks. Whether we work together or not.
Design Showcase
Top-tier design that wins users and investors
Design that drives metrics, not just aesthetics. From onboarding flows to full product suites
Design Showcase
Top-tier design that wins users and investors
Design that drives metrics, not just aesthetics. From onboarding flows to full product suites
Design Showcase
Top-tier design that wins users and investors
Design that drives metrics, not just aesthetics. From onboarding flows to full product suites
AI • Health-tech
Ed-tech
AI • Health-tech
AI • Health-tech
AI Web App • Consulting
Landing Page • Sports
Consulting
Landing Page • Ed-tech
Landing Page • Ed-tech
Design for category leader acquired by Semrush
"I had the pleasure of working with Marty at Brand24 and can wholeheartedly recommend him. He combines strong visual style with a thoughtful UX/UI approach, delivering designs that are not only aesthetically impressive but also highly effective in real-world implementation."
"I had the pleasure of working with Marty at Brand24 and can wholeheartedly recommend him. He combines strong visual style with a thoughtful UX/UI approach, delivering designs that are not only aesthetically impressive but also highly effective in real-world implementation."
Michal Sadowski
CEO & Founder at Brand24
#1 AI Social Listening Tool (Part of Semrush Group)
CEO & Founder at Brand24
#1 AI Social Listening Tool
Design serving 300+ universities and 2.5M students daily
"Marty was the foundational force behind our product's user experience. He masterfully navigated an incredibly complex landscape, becoming an expert across diverse and intricate academic operations use cases. Any team or client would be incredibly fortunate to have his talent and expertise."
"Marty was the foundational force behind our product's user experience. He masterfully navigated an incredibly complex landscape, becoming an expert across diverse and intricate academic operations use cases. Any team or client would be incredibly fortunate to have his talent and expertise."
Mara Koval
VP of Product at Coursedog
Serving 300+ US Campuses including Stanford, Cornell, and CUNY.
VP of Product at Coursedog
Serving 300+ US Campuses
VP of Product at Coursedog
Serving 300+ US Campuses
FAQ
FAQ
FAQ
Full-time designers cost $120K-180K/year, take months to hire, and might lack startup experience. If they don't work out? You've burned $50K+ before cutting losses. Agencies charge $50K-100K+ per project with 3-6 month timelines. Seniors sell you, juniors do the work. Freelancers run $5K-15K but quality varies, they need constant management, and disappear when you need revisions. With me: senior designer (10 years, 52 projects, $100M+ raised by clients) embedded like a co-founder, delivering in 2-6 weeks. You pay for output, not salaries. Pause when runway's tight. Resume when you've raised. No overhead, no ramping up someone who doesn't understand startups.
You can book an intro call directly in my calendar - most founders grab a slot within 24-48 hours. After our alignment call and securing payment, you get workspace access same-day and first design concepts hit your inbox within 48 hours of kickoff - not weeks later. Timeline depends on scope: • Landing pages usually take 1 week • Core flows take 2 weeks • Full MVPs take 2-6 weeks I move at startup speed, designed to fit your runway, not my convenience.
Me - Marty. You work directly with a senior product designer who's built products for Docplanner (687K daily users), Coursedog ($90M raised), and Brand24 (acquired by Semrush). 10 years in the startup space, 52 projects shipped, experience across ed-tech, healthcare, SaaS, and fintech. No juniors, no outsourcing, no handoffs. You get consistent quality, clear communication, and someone who understands startup constraints: limited runway, tight timelines, needing to impress investors while keeping users happy.
If it impacts how users sign up, stay, pay, or affects your product metrics – I design it. Full product design: • End-to-end web/mobile apps from scratch • Onboarding flows that convert signups to active users • Core product features and dashboards • User settings, billing flows, checkout experiences Marketing & growth: • High-converting landing pages • Investor pitch decks • Marketing site redesigns Focused improvements: • Single feature redesigns • Fixing specific conversion bottlenecks • Mobile app optimization • Design system creation • Product audits Small requests are fine too. Many founders start with a quick project, see results, then expand into ongoing partnership.
I iterate until you're 100% satisfied – no arbitrary revision limits. The process is built around tight feedback loops and early alignment, so you always have control. If something's off, I course-correct fast. Plus, you can pause or cancel anytime. No long-term contracts, no penalties. If it's not working, you're not locked in.
I primarily work through Slack (communication), Figma (design), Framer (websites), Loom (async updates), Trello (project tracking), Notion (documentation), and Google Meet (video calls). All standard tools your team likely already knows. If you use different tools – Linear, Asana, Discord, ClickUp, Monday, or anything else – I can adapt to your stack. The goal is to integrate seamlessly with your workflow, not force you to learn new platforms or switch what's already working for your team.
Simple. After our intro call, you get access to Slack (daily communication), Figma (live design files), and a project board (task tracking). Every time I have new deliverables, I share async updates via Slack explaining what I shipped, design decisions, and next steps. You drop feedback on your schedule, I iterate continuously. Your time commitment: 2-3 hours per week for reviews. No daily standups, no progress meetings eating your calendar. I'm async-first because founders don't have time for endless meetings. Tools I use: Slack, Figma, Loom, Trello/Notion. All standard, nothing proprietary to learn. I can also adapt to your stack (Linear, Asana, Discord, whatever you use).
Yes. I often collaborate with founders, developers, designers, and PMs. I adapt to your workflow, discuss all the details, and provide dev-ready deliverables with full documentation, making your team's lives easier, not harder.
Absolutely. I stay involved during implementation with QA to ensure design quality is preserved. After launch, I provide iteration support based on user feedback and analytics so your product keeps improving as you scale.
Full-time designers cost $120K-180K/year, take months to hire, and might lack startup experience. Agencies charge $50K+ with 3-6 month timelines and bloated processes. Freelancers are hit-or-miss and need constant management. With Designfellow, you get a senior product designer (10 years, 52 projects) embedded in your startup – delivering investor-ready quality in 2-6 weeks. Pause or cancel anytime. No overhead, no long ramp-up.
You can book an intro call directly in my calendar - most founders grab a slot within 24-48 hours. After our alignment call and securing payment, you get workspace access same-day and first design concepts hit your inbox within 48 hours of kickoff - not weeks later. Timeline depends on scope: • Landing pages usually take 1 week • Core flows take 2 weeks • Full MVPs take 2-6 weeks I move at startup speed, designed to fit your runway, not my convenience.
Me - Marty. You work directly with a senior product designer who's built products for Docplanner (687K daily users), Coursedog ($90M raised), and Brand24 (acquired by Semrush). 10 years in the startup space, 52 projects shipped, experience across ed-tech, healthcare, SaaS, and fintech. No juniors, no outsourcing, no handoffs. You get consistent quality, clear communication, and someone who understands startup constraints: limited runway, tight timelines, needing to impress investors while keeping users happy.
If it impacts how users sign up, stay, pay, or affects your product metrics – I design it. Full product design: • End-to-end web/mobile apps from scratch • Onboarding flows that convert signups to active users • Core product features and dashboards • User settings, billing flows, checkout experiences Marketing & growth: • High-converting landing pages • Investor pitch decks • Marketing site redesigns Focused improvements: • Single feature redesigns • Fixing specific conversion bottlenecks • Mobile app optimization • Design system creation • Product audits Small requests are fine too. Many founders start with a quick project, see results, then expand into ongoing partnership.
I iterate until you're 100% satisfied – no arbitrary revision limits. The process is built around tight feedback loops and early alignment, so you always have control. If something's off, I course-correct fast. Plus, you can pause or cancel anytime. No long-term contracts, no penalties. If it's not working, you're not locked in.
I primarily work through Slack (communication), Figma (design), Framer (websites), Loom (async updates), Trello (project tracking), Notion (documentation), and Google Meet (video calls). All standard tools your team likely already knows. If you use different tools – Linear, Asana, Discord, ClickUp, Monday, or anything else – I can adapt to your stack. The goal is to integrate seamlessly with your workflow, not force you to learn new platforms or switch what's already working for your team.
Simple. After our intro call, you get access to Slack (daily communication), Figma (live design files), and a project board (task tracking). Every time I have new deliverables, I share async updates via Slack explaining what I shipped, design decisions, and next steps. You drop feedback on your schedule, I iterate continuously. Your time commitment: 2-3 hours per week for reviews. No daily standups, no progress meetings eating your calendar. I'm async-first because founders don't have time for endless meetings. Tools I use: Slack, Figma, Loom, Trello/Notion. All standard, nothing proprietary to learn. I can also adapt to your stack (Linear, Asana, Discord, whatever you use).
Yes. I often collaborate with founders, developers, designers, and PMs. I adapt to your workflow, discuss all the details, and provide dev-ready deliverables with full documentation, making your team's lives easier, not harder.
Absolutely. I stay involved during implementation with QA to ensure design quality is preserved. After launch, I provide iteration support based on user feedback and analytics so your product keeps improving as you scale.
Currently booking for Q1 '26
Ready to build a product users want and investors bet on?
Book a free 30 min call. I'll review your biggest challenges, identify quick wins, and create a plan on how to make your product fundable – whether we work together or not.
30 minutes. We'll review what's broken and how to fix it in 2-6 weeks.
Currently booking for Q1 '26
Ready to build a product users want and investors bet on?
Book a free 30 min call. I'll review your biggest challenges, identify quick wins, and create a plan on how to make your product fundable – whether we work together or not.
30 minutes. We'll review what's broken and how to fix it in 2-6 weeks.
Designfellow is operated by Marty
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Designfellow is operated by Marty
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