Technical Co-Founder (Full-Stack – Flutter, NestJS, (TypeScript)

JR United Kingdom; City of Edinburgh; On-site; GBP 50,000 - 70,000; Full time

Job summary

A dynamic mobile marketplace seeks a Technical Co-Founder (Full-Stack) to lead the final stages of app development for card collectors. This is an equity-only role aiming to bring a nearly finished product to market. Ideal candidates are those excited to contribute significantly at an early-stage venture and lead development, ensuring the app meets user needs.

Benefits

Co-Founder Equity

Defined technology direction

Qualifications

• Experience in building and launching Flutter apps for iOS and Android.
• Proficient in working with marketplace and logistics/payment APIs.
• Strong self-directed leadership in technical development.

Responsibilities

• Finalize and launch the existing Flutter app.
• Manage the NestJS/NodeJS backend systems.
• Handle DevOps using AWS.

Skills

Flutter

NestJS

TypeScript

AWS

API Integration

Tools

AWS (EC2, Lambda, RDS, SNS)

eBay API

Shippo

PayPal

Job description

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Technical Co-Founder (Full-Stack – Flutter, NestJS, (TypeScript), edinburgh

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Client:

CHAAMO

Location:

edinburgh, United Kingdom

Job Category:

Other

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EU work permit required:

Yes

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Job Views:

5

Posted:

16.06.2025

Expiry Date:

31.07.2025

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Job Description:

CHAAMO is seeking a Technical Co-Founder (Full-Stack) to help finalise our marketplace app and prepare it for launch. The platform is already built using Flutter and NestJS (Typescript), and is nearly ready for testing. We're now looking for a hands-on technical partner to lead final development, optimise the stack, and help take CHAAMO to market.

This is an equity-only position for someone entrepreneurial who’s excited to co-own and co-launch a product with strong traction in an underserved niche.

About CHAAMO

CHAAMO is a mobile-first marketplace designed specifically for trading card collectors and sellers, from Pokémon and Magic: The Gathering to Yu-Gi-Oh! and sports cards. The current online selling experience is fragmented across general-purpose platforms, social media, and forums. CHAAMO brings everything into one intuitive mobile platform.

With built-in listings, eBay API support, direct messaging, shipping, and payment features, we’re making buying and selling cards faster, easier, and community-driven.

What You’ll Do

As a full-stack Technical Co-Founder, you'll take ownership of both mobile and backend development:

• Finalise and Launch the App: Complete development of the existing Flutter app (iOS and Android), polish features, fix bugs, and prepare for testing.
• Own Backend Systems: Manage and extend our NestJS/NodeJS backend and ensure smooth data handling and business logic.
• Handle DevOps and Infrastructure: Use AWS (EC2, Lambda, RDS, SNS) to maintain and scale the system.
• Integrate APIs: Finalise integrations with eBay APIs, and implement Shippo for shipping and PayPal for transactions.
• Collaborate on Product Strategy: Work alongside the founding team to prioritise features and shape the post-launch roadmap.
• Prepare for Growth: Ensure systems are built to handle increased user traffic and data as the marketplace scales.
• Frontend/Mobile: Flutter (iOS & Android)
• Infrastructure: AWS (EC2, Lambda, RDS, SNS)
• External Integrations: eBay APIs, Shippo (shipping), PayPal (payments)

Who You Are

We’re looking for someone with strong technical foundations and a builder’s mindset. You might be a solo developer, tech lead, or ex-startup engineer looking to step into a co-founder role.

You should:

• Have built and launched Flutter apps for both iOS and Android
• Know how to work with APIs, especially marketplace and logistics/payment APIs (e.g. eBay, Shippo, PayPal)
• Understand marketplace app architecture, listings, messaging, user accounts, search, etc.
• Be self-directed, organised, and ready to lead all aspects of technical development
• Be excited to join an early-stage venture and build something meaningful with real users in mind

What You’ll Get

• Co-Founder Equity: Join at a foundational level and share in the long-term success.
• Real Product, Not Just an Idea: Skip the MVP phase, we’ve already built the app and are nearly ready to test.
• Tech Leadership: You’ll define our stack, systems, and long-term technology direction.