Full-stack Developer

Huzzle

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Location: Worldwide
Job Type: full-time
Work Format: 🌍 Remote Worldwide
Salary: Unknown
Posted: June 15, 2026

Job Description

About Huzzle

At Huzzle, we connect high-performing B2B sales professionals with global companies across the UK, US, Canada, Europe, and Australia. Our clients include startups, digital agencies, and tech platforms in industries like SaaS, MarTech, FinTech, and EdTech. We match top sales talent to full-time remote roles where they’re hired directly into client teams and provided ongoing support by Huzzle.

Role Type: Full-time

Engagement: Independent Contractor

Job Summary

We’re hiring a Founding Engineer (Fullstack) to help take the product from zero to launch and beyond to product-market fit. This is a rare opportunity to work side-by-side with the founding team and play a defining role in shaping both the product and the company.

You’ll be responsible for building core systems, crafting exceptional user experiences, and driving technical decisions across the stack. This role is ideal for a highly intelligent, pragmatic builder who thrives in early-stage environments and has a track record of shipping complex, user-facing applications.

Key Responsibilities

Own end-to-end development of core product features across the fullstack, with a strong focus on frontend UX and performance.
Collaborate closely with the founder, product designer, and early users to iterate rapidly and deliver exceptional user experiences.
Design, build, and maintain scalable backend systems, including PostgreSQL schemas and Row-Level Security (RLS) via Supabase.
Develop and manage edge APIs, backend services, and workers to support real-time, high-performance applications.
Translate complex product concepts into intuitive, elegant, and user-friendly interfaces.
Make foundational architecture and infrastructure decisions that balance speed, scalability, and reliability.
Build and optimize systems to support product growth from early launch through scale.
Integrate and interact with smart contracts and blockchain infrastructure.
Own and maintain blockchain indexing systems to power real-time product functionality.
Develop modern authentication and digital asset experiences using technologies like WebAuthn.
Partner with fintech and infrastructure providers to deliver secure and scalable solutions.
Contribute to product strategy, experimentation, and iteration to help achieve product-market fit.
Establish and uphold strong engineering practices, performance standards, and a security-first mindset.

Requirements

Exceptional intellectual ability and curiosity, with a strong academic background (e.g. Computer Science, Mathematics, Physics, Electrical Engineering) or equivalent experience.
5+ years of software engineering experience, including at least 1 year at a senior level with high ownership.
Strong proficiency in TypeScript and React for building production-grade frontend applications.
Backend and systems experience; familiarity with Go or low-level/system design is a strong plus.
Extensive experience with PostgreSQL and scalable data architecture.
Proven track record of building and shipping complex user-facing products (e.g. social platforms, marketplaces, trading systems).
Strong interest in finance, blockchain/Web3, consumer apps, user psychology, and AI/LLMs.
A strong security-first mindset, with attention to data integrity and system resilience.
Ability to move fast, make pragmatic decisions, and thrive in ambiguity.
Strong communication skills and a collaborative, founder-level mindset.

Benefits

💻 Fully Remote: Work from anywhere with international teams

🚀 Career Growth: Join companies in SaaS, MarTech, and B2B services

🤝 Peer Community: Connect with high-performing sales professionals in our network

🧭 Ongoing Support: Receive guidance from Huzzle before and after placement

💰 Tailored Compensation: Salaries vary by client and candidate preference — we’ll match you with options that fit your goals

🎯 Who is this job for?

This role is best suited for a Senior Full-Stack Engineer or Founding Engineer with 5+ years of experience building and shipping complex user-facing products in startup environments. The candidate should have strong expertise in TypeScript, React, PostgreSQL, backend architecture, APIs, and scalable system design, with bonus experience in Go, blockchain/Web3, smart contracts, fintech infrastructure, AI/LLMs, and real-time applications. They should thrive in high-ownership, ambiguous environments, enjoy making foundational product and technical decisions, and be comfortable taking a product from zero to launch while working closely with founders and early users.

💬 Potential Interview Questions

How would you architect a full-stack application from zero to product-market fit?
I would prioritize rapid iteration, simple but scalable architecture, clear product feedback loops, and modular services that can evolve without requiring major rewrites as the product grows.
How would you design a PostgreSQL schema for a multi-tenant application using Supabase?
I would model tenant boundaries explicitly, implement Row-Level Security (RLS) policies, optimize indexing strategies, and ensure data isolation and security from the database layer upward.
What is Row-Level Security (RLS), and why is it valuable?
RLS allows access policies to be enforced directly within PostgreSQL, ensuring users can only access authorized records while reducing security risks caused by application-level mistakes.
How would you build a real-time application that scales efficiently?
I would use event-driven patterns, efficient database queries, caching where appropriate, real-time subscriptions, and carefully designed APIs to minimize latency and maximize responsiveness.
What challenges are unique to integrating blockchain infrastructure into a product?
Challenges include transaction finality, blockchain latency, indexing large amounts of on-chain data, handling wallet interactions, security considerations, and maintaining a smooth user experience.
How would you design a blockchain indexing system?
I would build services that consume blockchain events, normalize and store data efficiently, handle chain reorganizations, and provide fast query access for frontend applications.
What security considerations are important when building fintech or Web3 applications?
I focus on authentication, authorization, secure key management, input validation, auditability, data integrity, transaction verification, and minimizing attack surfaces.
How would you balance speed and scalability in an early-stage startup?
I would optimize for rapid learning and product validation while making architectural decisions that avoid obvious future bottlenecks without overengineering.
How do AI and LLMs influence modern product development?
AI can accelerate development workflows, power user-facing features, improve automation, and enhance decision-making, but outputs must be carefully validated for reliability and safety.
What qualities make a successful founding engineer?
Ownership, technical breadth, product thinking, strong communication, comfort with ambiguity, fast execution, and the ability to make pragmatic decisions while building both the product and engineering culture.

📋 Job Summary

Huzzle is hiring a Founding Full-Stack Developer to help build a product from zero to launch and drive it toward product-market fit alongside the founding team. In this fully remote role, you’ll own critical product decisions across the stack, working with TypeScript, React, PostgreSQL, Supabase, and modern backend technologies to create scalable systems, intuitive user experiences, and real-time applications. You'll also tackle cutting-edge challenges involving fintech infrastructure, Web3, blockchain integrations, authentication systems, and AI-powered products while helping define the company’s technical direction from day one. This is a rare opportunity for entrepreneurial engineers who thrive in early-stage startups, enjoy high ownership, and want to make a lasting impact on both the product and the company’s future.