Scala Backend Software Engineer (f/m)

Ledger; London; On-site; GBP 45,000 - 85,000

Job description

We’re the forever innovators. On a mission that goes beyond business. Securing digital ownership in a changing world. Unlocking true freedom. We’re revolutionaries.

Looking beyond today. Bridging excellence and pragmatism, with ambition and conviction, to push the limits of what’s possible. That’s what you’ll do here, in this playground of innovation. With leadership and trust, you’ll write the rules of new technology, and create products that redefine security in a digital age.

Founded in 2014, Ledger is the global platform for digital assets and Web3. Over 20% of the world’s crypto assets are secured through our Ledger Nanos. Headquartered in Paris and Vierzon, with offices in the UK, US, Switzerland, and Singapore, Ledger has a team of more than 500 professionals developing a variety of products and services to enable individuals and companies to securely buy, store, swap, grow, and manage crypto assets – including the Ledger hardware wallets line with more than 6 million units already sold in 200 countries.

Ledger Live is a Desktop and Mobile application that helps you manage all your blockchain-backed assets. It’s built in ReactJS (Electron on Desktop and React Native on Mobile) and supports multiple blockchains (coins & NFTs) as well as providing multiple financial services (Buy, Swap, Sell, Earn).

To sustain the company's growth, Ledger is looking for new talents. You will start by joining Ledger’s Consumer Services business unit to improve the existing transactional services and keep delivering new ones. The team focuses on creating easy, secure, and clever ways for consumers to buy, exchange, sell, send, receive, grow, and secure their crypto.

Your mission

• Build highly available, resilient, consistent, and performant microservices to power Ledger’s products.
• Integrate Buy, Sell, Earn, and Swap services by connecting to partner APIs.
• Design monitoring systems for detecting failures and ensuring efficient alerting.
• Set up logging for all API requests and responses.
• Ensure data integrity across multiple blockchain sources.
• Handle API authentication, rate limiting, and error handling.
• Engage proactively in architecture and design discussions to ensure scalable and feasible solutions.
• Maintain and evolve the existing stack, proposing and implementing technical improvements.
• Deliver high-quality software by testing, documenting, and demonstrating features.
• Develop and contribute to CI/CD pipelines to streamline deployments and security workflows.
• Conduct root cause analysis on software issues and implement practical fixes.
• Collaborate cross-functionally with other teams to complete projects.
• Contribute to building a shared knowledge base within Ledger.
• Improve software and systems engineering standards, including documentation.
• Represent Ledger in internal and external technical events (e.g., tech talks, blog posts, meetups).

What we're looking for

• Scala Backend Engineer: 2+ years of relevant engineering experience.
• Advanced Scala Expertise: Good mastery of Scala ideally on CatsIO or any similar framework; proficiency in another backend language (Rust, Java, Python, JavaScript/TypeScript) is a plus.
• Web3 & Blockchain Experience: Good understanding of blockchain fundamentals and ecosystem.
• Collaboration & Communication: Strong interpersonal skills with experience working in cross-functional teams.
• Architectural Expertise: Knowledge of web architecture patterns (e.g., microservices, event-driven, P2P).
• Containerization & Cloud: Understanding of Docker and Kubernetes.
• Multicultural Experience: Fluent English communication skills.
• Frontend Awareness: Basic understanding of frontend frameworks and ability to write simple frontend code in TypeScript is a great plus.

What's in it for you

• Equity: Employees are the foundation of our success, and we award stock options so you can share in that success as we grow.
• Flexibility: A hybrid work policy.
• Social: Frequent social events, snacks, and drinks in our Holborn office.
• Medical: Comprehensive health insurance policy offering extensive medical, dental, and vision care coverage.
• Well-being: Personal development, coaching & fitness with our dedicated partners.
• Vacation: 28 days of paid leave per year, in addition to national holidays.
• High tech: Access to high-performance office equipment and gadgets, including Apple products.
• Transport: Ledger reimburses part of your preferred means of transportation.
• Discounts: Employee discount on all our products.

We are an equal opportunity employer for all without any distinction of gender, ethnicity, religion, sexual orientation, social status, disability, or age.