Full Stack Engineer - Go (Mojito Product Team)

Serotonin Inc; Greater London; On-site; GBP 100,000 - 125,000; Full time

Job summary

A tech startup is seeking a Founding Full Stack Engineer to lead the design and build of their next-generation platform at the intersection of Web3 and consumer experiences. The ideal candidate will have expertise in Go and Next.js, and a crypto-native mindset with smart contract experience. This role is an opportunity to shape the company's technical culture and product strategy as they scale innovative digital solutions.

Qualifications

• Hands‑on production experience with Go, Next.js, SQL optimization, and Kubernetes.
• Deep familiarity with PostgreSQL, Docker, GCP, NATS, and caching strategies.
• Strong skills in building scalable UIs, APIs, and distributed microservices.

Responsibilities

• Lead the design and development of new product features across a Next.js frontend and Go-based backend.
• Operate and evolve our GCP / Kubernetes infrastructure for scalability and reliability.
• Architect and deploy smart contracts (Solidity / Move) on Ethereum and Sui.

Skills

Go

Next.js

SQL optimization

Kubernetes

PostgreSQL

Docker

Smart contract development

Tools

GCP

NATS

Job description

Full Stack Engineer - Go (Mojito Product Team)

Mojito is building the leading platform for crypto-native commerce and community. We empower brands and creators to launch digital experiences, marketplaces, and tokenized products with a seamless Web3 toolkit. Our team combines deep expertise in crypto, software, and consumer experiences, backed by top-tier investors and partners.

We’re looking for a Founding Full-Stack Engineer to join our core product team. This is a unique opportunity to own the architecture and implementation of a platform at the intersection of Web3 and consumer experiences. You’ll work across the stack from frontend to backend to infrastructure while helping define the technical culture and trajectory of the company.

What You’ll Do

• Lead the design and development of new product features across a Next.js frontend and Go-based backend
• Operate and evolve our GCP / Kubernetes infrastructure for scalability and reliability
• Build high-performance APIs and distributed microservices in Go + PostgreSQL, with a focus on SQL optimization and caching
• Architect and deploy smart contracts (Solidity / Move) on Ethereum and Sui, with security and robustness as top priorities
• Establish engineering best practices for code quality, observability, testing, and performance from the ground up
• Partner closely with the founding team on product strategy, architecture, and roadmap

What We’re Looking For

• Hands‑on production experience with Go, Next.js, SQL optimization, and Kubernetes
• Deep familiarity with PostgreSQL, Docker, GCP, NATS, and caching strategies
• Strong skills in building scalable UIs, APIs, and distributed microservices
• Crypto‑native mindset with smart contract development experience (Solidity on Ethereum, Move on Sui)
• Bonus: Strengths in performance tuning, observability, and tooling

The Ideal Mindset

• You thrive in an early‑stage startup environment and embrace founder‑like ownership
• You’re motivated to build and scale products that push the boundaries of Web3
• You care deeply about quality, security, and user experience
• You’re excited to help shape the technical and cultural foundation of Mojito