Full Stack Engineer - Go (Mojito Product Team)

Serotonin; City of London; On-site; GBP 104,000 - 134,000; Full time

Job summary

A technology firm in the crypto space is looking for a Full Stack Engineer to lead the design and development of product features. The ideal candidate has strong experience with Go, Next.js, and smart contract development. This role offers a chance to work in a fast-paced startup environment, contributing to the evolution of crypto-native commerce. Competitive salary from $140,000 to $180,000.

Qualifications

• Hands-on production experience with Go and Next.js.
• Deep familiarity with PostgreSQL, Docker, and GCP.
• Crypto-native mindset with smart contract development experience.

Responsibilities

• Lead design and development of new product features.
• Operate and evolve GCP/Kubernetes infrastructure.
• Architect and deploy smart contracts on Ethereum.

Skills

Go programming

Next.js

SQL optimization

Kubernetes

PostgreSQL

Docker

GCP

NATS

Smart contract development

Job description

Overview

Full Stack Engineer - Go (Mojito Product Team) role at Serotonin. 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.

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

About Serotonin

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

Seniority level

Not Applicable

Employment type

Full-time

Job function

Engineering and Information Technology

Industries

Advertising Services

London, England, United Kingdom

Salary: $140,000.00-$180,000.00