Senior Backend Engineer

Job Description

We’re looking for Senior Backend Engineers to join our Platform team.

The team builds and evolves the backend systems at the core of our products and customer-facing solutions.

In this role, you’ll design and operate distributed systems, work with Web3 infrastructure, and collaborate closely with product and platform engineers to deliver reliable, scalable solutions. We value strong ownership, thoughtful system design, and a high bar for code quality.

If you enjoy building solid systems, moving fast without cutting corners, and using modern tools (including AI) to work more efficiently, you’ll feel right at home with us.

What You’ll Do

• Design, build, and maintain scalable distributed backend systems powering platform and product capabilities.
• Own backend services end-to-end: from architecture and implementation to monitoring and long-term reliability.
• Work closely with product and engineering peers to actively shape product decisions — not just execute specs.
• Build and evolve Web3 platform backend components, including protocol integrations, support for newly emerging blockchain networks, and reliable interactions with smart contracts.
• Ensure high standards of code quality, performance, security, and observability.
• Operate comfortably in a fast-paced startup environment, balancing speed and correctness.
• Leverage AI-assisted tools to improve development velocity, code quality, and personal productivity.
• Contribute to technical discussions, reviews, and mentorship within the engineering team.

What We’re Looking For

• 5+ years of experience designing and building distributed backend systems.
• Strong foundation in algorithms, data structures, and software design patterns.
• Hands-on Web3 experience: Blockchain systems, dApps, Smart contracts.
• Strong ownership mindset — you take responsibility for outcomes, not just tasks.
• Clear, proactive communication in a distributed, async-first team.
• Ability to make pragmatic decisions: knowing when to move fast vs. go deep.
• High learning velocity and adaptability, especially when new tools or approaches (including AI-driven ones) improve results.

Technical Skill Set

• Excellent knowledge of Golang.
• Experience with containerized systems: Docker & Kubernetes.
• Databases: Postgres (SQL), MongoDB, Cassandra (NoSQL).
• Monitoring & observability: Sentry, Prometheus, Grafana.
• Hands-on experience with AWS.
• Experience with Python 3.

Bonus Points

• Prior experience working in a startup environment with high trust and autonomy.
• Located in time zones close to Europe.
• Strong collaboration skills and respect for diverse perspectives.
• Curiosity and willingness to challenge existing solutions when better ones exist.
• Thoughtful use of AI as a productivity multiplier, while maintaining a deep understanding of underlying systems and trade-offs.

Interview Process

• Screening Call – 30 minutes
• Hiring Manager Interview – 45 minutes
• Technical Interview – 60 minutes
• System Design Interview – 90 minutes
• Team Interview – 60 minutes
• Founders Call – up to 60 minutes
• Reference Check

Why You Should Join

Company Overview

Zerion Wallet

1.7M+ active funded wallets

27.6M+ transactions

2.5B+ transaction volume

416K+ unique holders of Zerion DNA NFT

Zerion API

Trusted by 43 top crypto brands as paying clients

Powering 405 active projects monthly

Over 3.1B total requests processed

Zerion Rewards (Loyalty Program)

167K+ wallets claimed retrodrop XP

837K+ quests completed

Culture: Our culture shines through in our strong team engagement and impressive retention, showing just how much we value creating a workplace where people truly want to stay and thrive.

People: Collaborate with some of the most driven and intelligent individuals in the crypto space.

Salary & Benefits: Receive a competitive salary, medical insurance, coworking membership, and additional benefits.

Unlimited Days Off and Flexible Work Schedule: Recharge and explore life outside the office with our flexible time-off policy and work schedule.

Remote Work Essentials: We provide all the necessary software and equipment to ensure you’re fully equipped to work from home comfortably and efficiently.

Stock Options: Contribute to Zerion’s success and watch your stock options become valuable.

Relocation: We support relocation for you and your family.

Travel: Join your colleagues on trips to industry festivals and events.

Distributed Team: Zerion is a fully remote team with members worldwide. Embrace asynchronous collaboration, find your own work rhythm, and enjoy a healthy work-life balance.

To ALL recruitment agencies and individual recruiters: Zerion only accepts resumes from its partners, with whom Zerion has contractual relations. Zerion is not responsible for any fees or charges associated with unsolicited resumes.

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.