SQL Full Stack Developer (m/w/d)
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. 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
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