Full Stack Engineer, Serotonin

Go, Mojito Product Team

Salary not provided

SQL

Docker

Kubernetes

GCP

Postgres

Next.js

Solidity

Junior, Mid and Senior level

London

More information about location

Marketing & product studio for Web 3.0

Be an early applicant

Marketing & product studio for Web 3.0

101-200 employees

B2BMarketingCommunicationFinancial ServicesWeb 3.0

Be an early applicant

Salary not provided

SQL

Docker

Kubernetes

GCP

Postgres

Next.js

Solidity

Junior, Mid and Senior level

London

More information about location

101-200 employees

B2BMarketingCommunicationFinancial ServicesWeb 3.0

Company mission

To build, incubate and bring to market Web 3.0 products that have broad appeal and solve problems for consumers and brands.

Job

Company

Role

Who you are

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

Desirable

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

What the job involves

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
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

Salary benchmarks

Our take

Founded in 2020, Serotonin is a marketing firm and product studio for transformative technologies. It helps companies develop and get attention for their Web 3.0 applications.

Serotonin was always well positioned within the industry given the pedigree of its founding team. For example, founder Amanda Cassatt is a pioneer in Web 3.0 and even assisted in the launch of the Ethereum blockchain.

The company birthed a new startup in Mojito, which has raised capital and is now supporting Sotheby’s Metaverse by helping sell NFTs. This lateral growth forebodes a promising future for the parent company as it looks to innovate in a market that has huge potential.

Kirsty

Company Specialist at Welcome to the Jungle

Insights

Led by a woman

2% employee growth in 12 months

Glassdoor (3.2)

Company

Company benefits

Health Insurance
Remote Work Environment

Leadership

Amanda Cassatt

(Founder & CEO)

Co-founded and serves as President for Mojito. Previously co-founded Slant News where they acted as Editorial Director, and has experience as CMO for ConsenSys.

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