Onlook is a visual design canvas that connects to your existing codebase. Designers drag real components onto an infinite canvas, make changes visually,
Featured on Y Combinator Work with founding engineers
Since 2022, we've collaborated with innovative startups in Silicon Valley to craft, develop, and deliver exceptional products.
20+
products delivered
3
3 open-source tools
3
years experience
100+
employees
Chosen by Visionaries
PARATUS HEALTH 
Exia Labs 
Sky 
Stack
MissionCriticalSaas about us
We build products that engineers are proud of
2022
Founded
SF
Based in Silicon Valley
$ spartan --init
→ loading modules...
→ engineering_excellence: enabled
→ status: ready
█
Services
Engineering excellence,
delivered
Our team operates like a founding engineering team: opinionated, fast, and deeply invested in the outcome. We don't just write code, we architect systems, challenge assumptions, and ship relentlessly.
Full-stack Engineering
End-to-end product development from architecture to deployment. React, Node, Go, Python, whatever the stack demands.
Product Design
Research-driven design that converts. We craft interfaces that feel intuitive and look exceptional.
Projects
Genuine effort, meaningful change
Watch data science become shareable, reusable intelligence that grows smarter with every conversation.
Automate data operations and reduce technical debt. Preserve knowledge and make AI actually useful
PARATUS HEALTH 
Gen AI Built for Healthcare. Designed for Your Phone Lines.
Atrix AI seamlessly integrates internal and external data sources, maintaining accuracy, transparency and auditability at every step.
The AI Platform powering NatCat Property Insurance
No projects in this category yet.
The figures
Trusted by high-growth teams
ResiQuant raises $4M to revolutionise property insurance with AI-powered insights.
ResiQuant
"The Spartan team is amazing! We had a very challenging ask for them in terms of technical rigor with limited available time, and they delivered. Their process is clean, well documented, and visible, so I always know what the team is doing and how. I really enjoy working with our team to the point that I feel like they are also members of our company."
- Francisco Galvis CTO & CO-FOUNDER @ resiquant
PhD Researcher, Stanford
Paratus Health raises $2.3M Seed Round to Turn Wait Times into Proactive Patient Care.
PARATUS HEALTH
"Using Spartan helped us double our engineering velocity right after Y Combinator. As a lean team moving fast, it gave us the talent and support we needed to scale without compromising on quality. It's like adding an excellent full-time employee in a matter of days."
- Pablo Bermudez-Canete Founder & CEO @ Paratus Health
BS Stanford
Onlook has raised a total funding of $500K over 1 round.
ONLOOK
"Spartan has been an invaluable partner in our journey. Their team's expertise and dedication have significantly accelerated our development process, allowing us to bring our vision to life faster than we could have imagined. We're grateful for their support and look forward to continuing this successful collaboration."
- John Doe CEO @ Onlook
BS Stanford
Rain raises $24.5M in round led by Norwest Venture Partners
rain
“I highly recommend partnering with Spartan for your engineering needs! Their team, led by Chan, excels at finding the right talent for every stage of your project. They have strong processes that make working with international teams seamless. Definitely worth it!”
- Charles Naut Founder & CTO @ Rain
Former project manager @ Microsoft, BS Stanford
sFox raised a total of $22.8M over 4 funding rounds: 3 Seed and 1 Early-Stage rounds.
sFOX
"Working with the Spartan team to build our product has been an incredible experience. Their expertise, dedication, and technical skills have exceeded our expectations. They are able to take loosely defined requirements and do the necessary market research to design a fantastic system that addresses all the main requirements exceeding even our expectations. I am also impressed by their speed and quality. They have been a fantastic partner, and we can't recommend them more."
- George Melika Founder @ SFOX
Co-Founder @ Volta
Testimonials
Don't trust our word
"Our company faced challenges with an established codebase. The Spartan engineers impressed me with their organized processes and enthusiasm. Their tailored onboarding eased my concerns about remote resources, and I'm proud to have them on our team."
Jane Jeong
- Co-founder & CTO @ REVIVA
- former software engineer @ zoom & aws
"The Spartan team is fantastic! They tackled a tough technical challenge under tight deadlines and delivered impressively. Their process is clear and well-documented, keeping me informed about their work. I truly enjoy collaborating with them, feeling like they're part of our company."
Francisco Galvis
- CTO & CO-FOUNDER @ resiquant
- PhD Researcher, Stanford
"I highly recommend partnering with Spartan for your engineering needs! Their team, led by Chan, excels at finding the right talent for every stage of your project. They have strong processes that make working with international teams seamless. Definitely worth it!"
Vera Kutsenko
- FOUNDER & CEO @ ATRIX AI
- former co-founder & cto, beehyve
- FORMER SOFTWARE ENGINEER @ UBER & FACEBOOK
"I highly recommend partnering with Spartan for your engineering needs! Their team, led by Chan, excels at finding the right talent for every stage of your project. They have strong processes that make working with international teams seamless. Definitely worth it!"
Charles Naut
- Founder & CTO @ Rain
- FORMER project manager @ Microsoft
- BS Stanford
"Spartan stands out for startups and scale-ups exploring outsourcing. Their engineering team excels, offering more than just solutions - they're dedicated partners in your success."
Asa Downs
- principal software engineer @ heru
- FORMER sr. software engineer @ biolog & amazon studios
"Our company faced challenges with an established codebase. The Spartan engineers impressed me with their organized processes and enthusiasm. Their tailored onboarding eased my concerns about remote resources, and I'm proud to have them on our team."
Jane Jeong
- Co-founder & CTO @ REVIVA
- former software engineer @ zoom & aws
"The Spartan team is fantastic! They tackled a tough technical challenge under tight deadlines and delivered impressively. Their process is clear and well-documented, keeping me informed about their work. I truly enjoy collaborating with them, feeling like they're part of our company."
Francisco Galvis
- CTO & CO-FOUNDER @ resiquant
- PhD Researcher, Stanford
"I highly recommend partnering with Spartan for your engineering needs! Their team, led by Chan, excels at finding the right talent for every stage of your project. They have strong processes that make working with international teams seamless. Definitely worth it!"
Vera Kutsenko
- FOUNDER & CEO @ ATRIX AI
- former co-founder & cto, beehyve
- FORMER SOFTWARE ENGINEER @ UBER & FACEBOOK
"I highly recommend partnering with Spartan for your engineering needs! Their team, led by Chan, excels at finding the right talent for every stage of your project. They have strong processes that make working with international teams seamless. Definitely worth it!"
Charles Naut
- Founder & CTO @ Rain
- FORMER project manager @ Microsoft
- BS Stanford
"Spartan stands out for startups and scale-ups exploring outsourcing. Their engineering team excels, offering more than just solutions - they're dedicated partners in your success."
Asa Downs
- principal software engineer @ heru
- FORMER sr. software engineer @ biolog & amazon studios
"Spartan stands out for startups and scale-ups exploring outsourcing. Their engineering team excels, offering more than just solutions - they're dedicated partners in your success."
Justin Balthrop
- Co-founder & CTO @ Triangle
- FORMER Co-founder @ Bird
"Spartan's engineers are truly phenomenal. Their focus on long-term value rather than just completing tasks has made a significant impact on our operations."
Travis Vander Zanden
- Chairman & FOUNDER @ BIRD
- former VP @ UBER
- FORMER COO @ LYFT
"My Spartan team goes above and beyond to keep me in the loop, with ample documentation, daily standups, and code reviews. With Spartan, it feels like my engineers are part of my team."
James Webb
- Founder & CTO @ Sidecar Data
- BS Stanford
"Chan and the Spartan team are hands down the best engineering team I've ever worked with. Their organization, thorough research, intuition, and work ethic are truly exceptional."
James Webb
- Founder & CEO @ regimen
- co-founder @ mad ruk
"After several disappointing experiences with dev agencies, I found Spartan. Initially skeptical, I quickly migrated my projects to them within a month. Their fast, high-quality software engineering is rare!"
Cody Zhang
- founder & angel investor @ cz
- former PRODUCT & ENGINEERING LEAD @ AGORA
"Spartan stands out for startups and scale-ups exploring outsourcing. Their engineering team excels, offering more than just solutions - they're dedicated partners in your success."
Justin Balthrop
- Co-founder & CTO @ Triangle
- FORMER Co-founder @ Bird
"Spartan's engineers are truly phenomenal. Their focus on long-term value rather than just completing tasks has made a significant impact on our operations."
Travis Vander Zanden
- Chairman & FOUNDER @ BIRD
- former VP @ UBER
- FORMER COO @ LYFT
"My Spartan team goes above and beyond to keep me in the loop, with ample documentation, daily standups, and code reviews. With Spartan, it feels like my engineers are part of my team."
James Webb
- Founder & CTO @ Sidecar Data
- BS Stanford
"Chan and the Spartan team are hands down the best engineering team I've ever worked with. Their organization, thorough research, intuition, and work ethic are truly exceptional."
James Webb
- Founder & CEO @ regimen
- co-founder @ mad ruk
"After several disappointing experiences with dev agencies, I found Spartan. Initially skeptical, I quickly migrated my projects to them within a month. Their fast, high-quality software engineering is rare!"
Cody Zhang
- founder & angel investor @ cz
- former PRODUCT & ENGINEERING LEAD @ AGORA
"Spartan is one of the best firms I've worked with across multiple projects and companies. They ramp up quickly, consistently adding value."
Scott Rushfort
- cto @ pura
- FORMER CVO @ bird
"Using Spartan helped us double our engineering velocity right after Y Combinator. As a lean team moving fast, it gave us the talent and support we needed to scale without compromising on quality. It's like adding an excellent full-time employee in a matter of days."
Pablo Bermudez-Canete
- founder & CEO @ Paratus Health
- bs stanford
"Switching from in-house teams to Spartan for my Fintech startup was a game-changer. Their rapid, high-quality software engineering exceeded expectations."
Ryan Fujiu
- SVP Product & Design @ Super.com
- Former ceo @ liquidity financial
- FORMER head @ uber
"The Spartan team is the best off-shore team I've worked with. Each developer is skilled, supportive, and responsive. They handled a challenging migration flawlessly. CEO Chan is a fair sounding board. Camber looks forward to a strong partnership with Spartan ahead."
Aristotle Socrates
- Founder & CEO @ Camber Cloud
- former CTO @ pistil data
"In the fast-paced world of startups, the Spartan team is essential. They deliver high-quality code quickly, keeping us updated on their progress. They meet tight deadlines and adapt to changes effortlessly, working independently or with guidance as needed."
Serj Kazar
- CO-FOUNDER & CTO @ exia labs
- FORMER principal software engineer @ riot games
- FORMER Engineering Manager @ bird
"Spartan is one of the best firms I've worked with across multiple projects and companies. They ramp up quickly, consistently adding value."
Scott Rushfort
- cto @ pura
- FORMER CVO @ bird
"Using Spartan helped us double our engineering velocity right after Y Combinator. As a lean team moving fast, it gave us the talent and support we needed to scale without compromising on quality. It's like adding an excellent full-time employee in a matter of days."
Pablo Bermudez-Canete
- founder & CEO @ Paratus Health
- bs stanford
"Switching from in-house teams to Spartan for my Fintech startup was a game-changer. Their rapid, high-quality software engineering exceeded expectations."
Ryan Fujiu
- SVP Product & Design @ Super.com
- Former ceo @ liquidity financial
- FORMER head @ uber
"The Spartan team is the best off-shore team I've worked with. Each developer is skilled, supportive, and responsive. They handled a challenging migration flawlessly. CEO Chan is a fair sounding board. Camber looks forward to a strong partnership with Spartan ahead."
Aristotle Socrates
- Founder & CEO @ Camber Cloud
- former CTO @ pistil data
"In the fast-paced world of startups, the Spartan team is essential. They deliver high-quality code quickly, keeping us updated on their progress. They meet tight deadlines and adapt to changes effortlessly, working independently or with guidance as needed."
Serj Kazar
- CO-FOUNDER & CTO @ exia labs
- FORMER principal software engineer @ riot games
- FORMER Engineering Manager @ bird
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