Senior Software Engineer

About CoinList
CoinList is a leading crypto financial platform supporting the full lifecycle of crypto investment. We offer a comprehensive suite of services, including token sales, trading, lending, staking, and access to DeFi opportunities. CoinList has helped raise over $1.1 billion for groundbreaking projects, establishing itself as the go-to platform for innovative blockchain companies. Our platform is trusted by validators, miners, founders, crypto funds, and a broad array of crypto enthusiasts globally.

The Opportunity
We're looking for a Senior Software Engineer (Full Stack, Backend-leaning) to join our Core Team. You'll play a key role in building and scaling the core financial infrastructure that powers CoinList's money movement, wallet, and custody solutions, while also owning and improving our web application experience. This is a high-impact role where you'll ship production systems, shape product direction, and help set technical standards for the team. This role is ideal for a full stack engineer (backend-leaning) who thrives in product-focused environments, cares deeply about UX and frontend polish, and is excited to own both backend infrastructure and web product experiences in a fast-paced fintech startup.

What You'll Do

• Design, build, and scale robust financial software systems and backend services that power money movement, custody, and payment flows.
• Develop and maintain web frontends (React, LiveView) with a focus on UX, collaborating closely with designers to deliver polished, user-friendly products.
• Architect and optimize wallet and custody solutions for a variety of cryptocurrencies, ensuring security, reliability, and scalability.
• Own projects end-to-end: From concept and design through implementation, testing, deployment, and monitoring.
• Collaborate cross-functionally with product, compliance, and other engineering teams to deliver secure and delightful financial products.
• Participate in code reviews, share knowledge, and help upskill junior engineers.
• Identify and address performance bottlenecks, reliability gaps, and opportunities for automation.
• Influence product and technical direction, working closely with leadership and crypto founders.

Requirements

• 5+ years of professional engineering experience shipping high-quality code in production environments
• Strong coding fundamentals
• Proven experience scaling financial systems (fintech, payments, trading, or crypto/DeFi platforms).
• Security-first mindset and deep understanding of best practices in financial software development.
• Experience with, or open to learning and working with, Elixir and LiveView (backend and frontend).
• Demonstrated experience building and maintaining production web frontends (React, LiveView, or similar).
• Track record of product ownership, attention to detail, and working collaboratively with designers.

Bonus Skills

• Experience with distributed systems or microservices architecture.
• Prior Elixir experience is a plus but not required-willingness and ability to learn is key.
• Familiarity with blockchain protocols, crypto custody, or staking systems.
• Experience integrating with payment rails, ledgers, or compliance systems.
• Contributions to open-source projects or crypto communities.
• Backend engineering fundamentals with experience in modern languages (Elixir, Ruby, Go, TypeScript, Python, etc.).

Tech Stack

• Elixir (primary), LiveView (frontend), Ruby. Most new development is in Elixir and LiveView.
• Legacy systems in Ruby on Rails and React.

Benefits
$128,000 – $179,000 USD base + significant equity
(depending on experience/location)