Full Stack Engineer - Marketplace Infrastructure
ConstructionYardSale.com · Hartford ·
- Work mode
- Hybrid
- Employment
- Part time
- Category
- Fullstack
- Company size
- 1-10
ConstructionYardSale.com · Hartford ·
Material Retail · New York City
Portfolio BI · New York, New York, United States
Tradeify.co
Golden · Los Angeles
One of two founding full-stack engineers taking ownership of a peer-to-peer construction materials marketplace's infrastructure: a Node.js BFF layer over Sharetribe, Stripe Connect payment/escrow flows, and Supabase automations, plus the notification, DevOps, and monitoring stack. Remote (US), part-time to start, equity-only compensation.
Compensation: 0.5% – 1.0%
Quick Facts
About ConstructionYardSale.com
ConstructionYardSale.com is a verified peer-to-peer marketplace for buying and selling used, surplus, and overstock construction materials and equipment - built for contractors, HVAC and electrical trade professionals, builders, remodelers, and DIY homeowners. We're launching first in Hartford County, Connecticut, with New England expansion planned for later this year.
Every transaction is local pickup only - no freight, no shipping to manage. Payments are protected by a pickup-code release/verfication system: the buyer generates a release code and hands it to the seller at pickup, which triggers payment capture and payout. Simple on the surface but behind it sits a real, interconnected system: a custom API layer on top of a hosted marketplace platform, a marketplace payments architecture on Stripe Connect, event-driven automations in Supabase, and a full notification, monitoring, and security stack around all of it.
We're a small, founder-led team, pre-launch and pre-institutional-funding. There's no cash compensation on this role right now. What's on offer is real ownership of a live product handling real transactions from day one.
The Full Stack
This is the complete picture of what you'd be stepping into. You will need some expertise in most tools on day one, and you should be excited to become the person who understands how all of it connects and works.
Core platform & backend
Payments & money movement
Automations (Supabase event-driven functions)
Communications & notifications
DevOps, monitoring & security
Data, accounting & operations
The reason we're listing everything is that this role isn't about any one tool, it's about the seams between them. A single transaction touches nearly the whole stack:
A user signs up → Supabase handles auth and OTP (SMS via Twilio Verify, emails via Postmark), and a linked Sharetribe account is created behind the scenes. They list an item → the listing flows through the BFF layer, gets screened by our AI moderation function, and can be boosted via a Stripe purchase. A buyer checks out → Stripe Connect places a destination-charge pre-authorization, and Stripe Tax runs calculations on both the item and our fee. A Supabase function generates the buyer's pickup code. At pickup, the buyer hands the seller the code → verification triggers payment capture, the seller's payout routes toward Mercury, and Courier and Twilio fire the confirmation notifications. Reviews post and get averaged by another Supabase function. Acodei syncs the whole transaction into QuickBooks, Plausible tracks the funnel, Sentry tells us if anything broke along the way, and Cloudflare Zero Trust keeps the internal surfaces locked down.
If reading that paragraph makes you want to open the repos and see how it's wired - this is your role.
About the Role
Our current infrastructure contractor is wrapping up his engagement around launch, and we need someone to take over everything above and work with our second founding Engineer. There will be two of you, but you will take on a lot of responsibility. Picture this as a hybrid role: hands-on implementation work - building endpoints, fixing bugs, shipping changes - combined with full architectural ownership of the system, and more dedicated day-to-day attention than any prior contributor has given it.
You'd be one of a very small number of people who understand how the whole system fits together. That means real autonomy over technical decisions, direct input on what gets built next, and no bureaucracy between you and shipping.
What You'd Own
What We're Looking For
Nice to Have
Compensation This is an equity-only engagement to start - there's no cash compensation at this stage. Consistent with how we've structured other roles on the team, we're proposing a target ownership stake of 0.5%to 1% of the Company's fully diluted capitalization at time of issuance. The final percentage, vesting schedule, and other equity terms will be set out in a Stock Purchase Agreement once we complete our planned conversion from an LLC to a Delaware C-Corporation. In the meantime, this would begin as an independent contractor engagement covering scope and IP assignment. Happy to talk specifics during the interview process.
How to Apply
Send a short note about your experience with Stripe, Supabase, and/or marketplace platforms — and if the "How It All Fits Together" section above genuinely excited you, say so and tell us why. Links to relevant code or projects are welcome. We're moving quickly ahead of our August 15 launch and would love to talk soon.