Your Custom Sharetribe Marketplace, Our Engineering
Horizon Labs is a boutique software agency with developers in the United States and Turkey. We have been building marketplaces and tech startups since 2016, built our first Sharetribe custom marketplace in 2022, and have been a Sharetribe expert partner since 2023. If you have a new marketplace, we will help you launch it. If you have an existing marketplace, we will help you expand it with custom code.
Clear estimations, milestone-based contracts, and IP protection with 6+ month warranty on all delivered code. As Sharetribe partners we offer discounted project pricing. Start by scheduling a 30-min consultation now.
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Our Sharetribe Story
We built and scaled our own marketplace MVP on Sharetribe in 2021. That hands-on build showed us where Sharetribe shines and where to extend with code. In 2023, after learning we ran a developer agency, the Sharetribe team invited us into their Expert network which connects Sharetribe users and marketplace founders with vetted agencies like Horizon Labs.
We have since delivered multiple Sharetribe projects—some from idea to launch until acquisition, others migrated from Shopify, WordPress/WooCommerce, or Webflow. Same approach every time: launch the smallest useful version, keep you in control of code and budget, extend only when it pays. Contact us if you need any Sharetribe questions answered.
Why Us
Services
Expertise:
Types of Sharetribe Marketplaces
Marketplace ideas differ, but the winners share a few traits: quick onboarding, honest listings, fast search, and payouts everyone trusts. We’ve built rentals, services, product catalogs, and B2B flows on Sharetribe. You stay in control of scope, budget, and code.
Rental Marketplaces
Rentals live or die on accurate calendars and fair money flows. We set up reliable availability, calendar sync, and buffer times so double-booking doesn’t happen. Deposits and check-in/out photos reduce disputes. Clear rules for cancellations and refunds keep trust high. Owners see simple dashboards and on-time payouts; renters see fees up front and reminders that prevent mistakes.
Service Marketplaces
People buy time and expertise, not forms. We make scheduling simple with hourly or daily slots, instant book or request-to-book, and clean reschedules. Providers get profiles that show proof of quality and tools to manage their week. Customers see real availability, clear pricing, and reviews that matter. The result is more completed bookings and more repeat work.
Product Marketplaces
Shoppers want a clear catalog and a checkout that never breaks. We design rich listings with the right attributes, tuned search and filters, and carts that handle variations and bundles. Sellers get bulk upload, inventory controls, order management, and predictable payouts. You get tax and shipping set up correctly, plus returns and refunds that don’t swamp support.
Other Marketplaces
Have something less standard—lessons, events, equipment, or B2B? We tailor the flow: quotes and approvals, group sizes, waivers, delivery zones, tiered pricing, tax-exempt accounts, and invoicing with payment terms. Sharetribe gives the foundation; we add only what your model needs so you can launch cleanly and grow with confidence.
Testimonials.
It doesn't matter what sized project you give us, Horizon Labs is dedicated to providing the very best product engineering experience to teams who trust us to build with them.
Sonny Mo
Co-Founder & CEO @ Bloom (YC W21)
**“HorizonLabs Team is one of the most technically gifted leaders and engineering teams I've ever worked with! They are swift executors and also generally very likable people who are fun to work with. We are very fortunate to have worked with them!”
**
Josh Archer
CTO @ Arketa (YC S22)
"They absolutely nailed it, getting everything done on time and without busting the budget. Seriously, their game was on point! They kept things smooth throughout. Major props to them and can't wait to work on more stuff together."
Dan Lee
Co-Founder & CEO @ Yura Health
“Horizon Labs is a high quality, responsive team with fast turnaround on sprints."
Samir Sen
Co-Founder & CEO @ FlairLabs (YC S22)
"Horizon Labs has strong skills and experience with OpenAI, LLMs, API development, Kubernetes, and cloud deployment. Their engineering support helped us deliver production-ready application we could roll out to customers fast."
Marcus Ellison
Chief Technology Officer @ TrueChoice
“Horizon Labs vastly increased our visibility into technical workflows and capacity to achieve projected outcomes. They have a fast and reliable team with exceptional integrity and commitment to doing a good job. Thanks horizonlabs!”
Victor Tang
Chief Product Officer @ Corros
“We worked with another agency and faced surprising costs because of unthought estimations. Working with HorizonLabs enabled us to work without surprises with well set estimations and expectations.”
Shraysi Tandon
Co-Founder & CEO @ Kidsy
“Horizon Labs feels like part of our company, even though they’re outsourced. They have a strong skill set and are proactive about getting things done.”
Haamid Ali
Founder @ Cresance (Alchemist + StartX)
"They were very collaborative and had excellent communication and technical expertise, keeping me informed on each step of the project through delivery."
Clients
Clients
Our Sharetribe Clients.
We've worked with marketplaces of all sizes including rental, service, product, and other marketplace types. Sharetribe makes it easy to launch fast and iterate with customer feedback.
Unifreelancer
Marketplace
Freelance marketplace for students and alumni connecting trusted university talent with small business & startup clients
Sick Day Sports Club
Marketplace
Sick Day Sports Club turns your sick days into epic adventures with personalized outings guided by local adventure pros.
Kidsy
Marketplace
Kidsy offers affordable, open-box and gently-used kids' gear from top brands, saving your wallet and the planet.
Rarewaters
Marketplace
Fly-fishing marketplace offering access to private waters, season passes, and a community for anglers.
Patcom Medical
Marketplace
Healthcare training marketplace for Speech-Language Pathology (SLP), centralizing mentorship and specialized courses.
Boat.rent
Marketplace
BoatRent connects renters directly to boat owners, simplifying bookings and yacht charters with zero commission fees.
Why Us?
You hire us to make progress. We ship investor-grade software fast and keep it simple: clear milestones, weekly demos, clean handoffs. You own the IP and get a dependable team that moves like an extension of yours.
Estimation Process
**We start by defining “done” in numbers: users, dates, and a demoable scope. Then we price by milestone, list the risks in plain English, and show trade-offs if you want faster or cheaper. Unknowns become a short discovery sprint, not hand-waving. You see timeline, budget, and acceptance criteria up front before signing a contract. No surprises later.
**
Project Approach
**We ship in sprints with weekly reviews, CI/CD, tests, and telemetry. Technical teams get architecture docs, task manager access, and code reviews; non-technical teams get outcomes and clear next steps. Change requests are explicit, priced, and scheduled. We use Google Spaces for async communication and are available 24/7 for emergencies.
**
Our Guarantee
**We deliver or you don't pay for it. We invoice coinciding with our 2-week sprints so you will see regular progress. All code and IP are yours from day one. We fix defects found within our original, non-altered cost for six months at no charge. No lock-in, no proprietary frameworks, no hostage code. Just working software you can maintain.
**
Post-Contract Support
**We don’t disappear after launch. You get documentation, handover, and a six-month warranty on what we built. We set up monitoring, alerting, and backups before go-live. Need more help? Keep us on a lightweight growth retainer for small features, performance work, or on-call support. Your team can run it without us; we make sure of that.
**
SMB, Scaleup, and Startup Experience
**We’ve shipped 60+ products across manufacturing, healthtech, marketplaces, and AI. For SMBs and mid-market teams we modernize operations: portals, IoT dashboards, ERP/CRM integrations. For startups we deliver MVPs in weeks that stand up to investor diligence. Different buyers, same playbook: focus the scope, ship a real thing, iterate with customer feedback and data.
**
American Guarantee
**California leadership, US contract law, and US data standards with an offshore team in Turkey. US project management with US and Turkish delivery teams that follow a 6am - 7pm Pacific schedule for customer requests. Clear security practices, background-checked staff, and SOC-friendly workflows. If it breaks within warranty, we fix it. If we say a date, we hit it. That’s the promise.
**
Services
Expertise:
We Know Sharetribe.
We’ve built on Sharetribe since 2023 and use it because it gets the transaction right. We start small, ship quickly, and extend the platform only where it pays off. You keep the IP and the repo. Scale your team up or down as needed.
Launch on Sharetribe
Do you need a Sharetribe marketplace app built and launched within 1-3 months?
Start with the smallest version that proves people want what you’re offering. We set up listings, search, messaging, payments, and reviews, then ship in short, visible steps. You get weekly demos, clear milestones, and a repo your team owns. If something we built fails within warranty, we fix it. The goal is a working marketplace in weeks, not a deck. We can also build a mobile app that mirrors your web features.
Enhance What You Have
Do you need new features or enhancements made to your Sharetribe marketplace?
If you already run on Sharetribe, we remove friction and add only what moves the needle. Typical wins: saved searches, team accounts, deposits, subscriptions, better search, and cleaner checkouts. We ship upgrades in small batches with no drama and minimal downtime. Each change is measured against conversion or support load so you see the effect, not just the code.
Migrate to Sharetribe
Do you want to move your marketplace from Shopify, Wordpress, or custom code without losing your SEO or data?
Moving from WordPress, Shopify, or custom code shouldn’t cost you traffic or data. We map fields, preserve URLs with redirects, and test on staging before any cutover. Users, listings, photos, orders, payouts, and reviews come with you. After launch we run checks, fix loose ends, and train your team. The result is a simpler stack and faster product work the next day.
Short, Hourly Consults
Do you need a few hours of Sharetribe development-related support or questions answered over screenshare?
Sometimes you just need clear answers from an expert. Book a screenshare and we’ll review your flows, audit your process, compare Flex vs Go, or troubleshoot a sticking point. You leave with a short action plan, risks called out, and ballpark effort. Schedule your consults whenever you need them. Project estimations & proposals are free so use them to compare options if necessary.
Team
Team
Your Engineering Team.
We are small business owners, startup founders, and engineering leaders who love building products with ambitious teams. Contact us below to talk about how we can help you build products your customers will love.
Sinan Sari
Software engineer
product lead / CEO
Sinan is based in Irvine, CA and is a systems and processes nut. He was co-founder & CTO of Cuboh (YC S19), a senior software engineer at Tasso & Oscar Health, and a co-founder at Kidsy which was built on Sharetribe. He loves working on healthtech & e-commerce/marketplace projects. He does a little bit of everything depending on what our clients need.
[](mailto:sinan@horizon-labs.co?subject=From%20Horizon-Labs.co's%20website)[](https://bookface.ycombinator.com/user/272705)[](https://www.linkedin.com/in/mehmetsinan/)
Serdar Pehlivan
Software Engineer
Engineering Lead / CTO
Serdar is based in Turkey and oversees developer output & training. A math Olympiad medalist and PhD in Computer Engineering from the University of Connecticut, Serdar's work ensures our developers deliver quality code on time and on schedule. He prepares every proposal, bi-weekly report, and financial reports for each client personally.
[](mailto:saif@horizon-labs.co?subject=Email%20from%20Horizon-Labs.co's%20website)[](https://www.linkedin.com/in/serdar-pehlivano%C4%9Flu-1838a259/)
Services
Expertise:
Sharetribe Features
Sharetribe gives strong building blocks. We turn them into a marketplace that fits your model.
Marketplace Features
Day-one flows your users expect: profiles, listings, search and filters, messaging, bookings or checkout, reviews, and Stripe payments with payouts and refunds. We tailor listing fields and availability rules, set clear steps for both sides of the transaction, and keep pages fast so people complete the purchase.
No-code Customizations
Many changes don’t need new code. We use Sharetribe settings to adjust fees, policies, availability, emails, translations, and page layout so you can test ideas safely. When no-code reaches a limit, we add small, focused code instead of a rebuild.
Marketplace Management
Operations stay calm when the back office is clean. We set up moderation, approvals, refunds, disputes, bulk tools, and simple dashboards for your team. Alerts flag issues before they become support tickets, and exports give finance and support what they need without chasing engineering.
Growth
We prepare the ground for compounding growth: SEO-friendly pages and URLs, structured data, fast load times, and a light CMS for category and location pages. Saved searches and alerts bring buyers back. We add analytics, conversion tracking, and CRM hooks so you can see what works and repeat it.
Developer Platform
When you need more control, we use Sharetribe’s APIs and webhooks to add custom flows and integrations—identity checks, shipping, taxes, search, accounting, or data warehouse. Clean repos, tests, CI/CD, and docs mean your team can maintain it after handover.
Hosting & Infrastructure
Your marketplace should be quick and dependable. We deploy modern front ends (Vercel/Netlify), separate staging and production, and set up monitoring, error tracking, logging, and backups. Images are optimized, CDNs are tuned, and access is locked down so you ship with confidence.
Sharetribe FeaturesSharetribe FeaturesSharetribe FAQs
Resources
Resources
Product Development Resources.
We've been in our customers shoes and know how valuable the right communities, tools, and network can be, especially when bootstrapped. Here are a few that we recommend.
Need Sharetribe Developers?
We help build Sharetribe marketplaces your customers will love (without the engineering headaches). US leadership with American & Turkish delivery teams you can trust.
Contact us now to start your free consultation.
Need help deciding what to build first?
Send Horizon Labs the current stage of your product, team, timeline, and budget. The team will give a practical next step.