Senior Backend Engineer

We're looking for a

Senior Backend Engineer

to join

our backend team at Zerion. This 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, support, and the clients building on our API 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 AI as a core part of how you work, 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. Scope

solutions with the clients

building on our API: turn a vague request into a concrete proposal, and the proposal into a plan the team can build. 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. Use AI as a core part

of your engineering workflow — designing, reviewing, debugging and shipping with it. This is how the team works day to day, not an experiment we're running. 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 knowledge of

algorithms, data structures, and software design patterns

. Comfortable working in a

fast-paced startup environment

. Strong desire to

actively contribute to product evolution

, not just implementation. Comfortable

working directly with customers

— hearing a vague problem and coming back with a concrete proposal. Hands-on,

daily use of AI in your engineering work

. You should be able to talk concretely about where it has changed how you build, and where you've learned not to trust it. High standards for

code quality, system reliability, and user experience

— you care about getting it right, not just getting it done. Strong

ownership mindset

— you take responsibility for outcomes, not just tasks. Clear and proactive

communication

in a distributed team. Pragmatic decision-making: knowing when to

move fast vs. go deep

. Ability to

learn quickly and adapt

. Technical Skill Set

Excellent knowledge of

Golang is a plus, not a blocker. Experience with

containerized systems

: Docker & Kubernetes. Experience with

databases

: SQL: Postgres NoSQL: MongoDB, Cassandra Experience with

monitoring and observability tools

: Sentry, Prometheus, Grafana. Hands-on experience with

AWS (Amazon Web Services)

. Experience with

Python 3

. Comfort experimenting with and integrating

AI-assisted workflows

into daily engineering work. Bonus Points

Hands-on Web3 experience:

Blockchain systems, dApps, Smart contracts. Prior experience in a

startup environment

that emphasizes

trust and autonomy

. Located in

time zones close to Europe

for smoother collaboration. Collaborative mindset

and respect for different perspectives. Curiosity and willingness to

challenge existing solutions

when better ones exist. Interview Process

Screening Call

– 30 minutes Hiring Manager Interview

– 45 minutes Technical Interview

– 90 minutes (includes a real-world challenge where you'll work with AI tools directly) System Design Interview

– 90 minutes Team Interview

– 60 minutes Founders Call

– up to 60 minutes Reference Check Why You Should Join

Company Overview

Zerion API

Trusted by 50+ top crypto brands as paying clients Powering 2k+ active clients monthly Over [3.1B]( total requests processed Zerion Wallet

[1.7M]( active funded wallets [27.6M]( transactions [2.5B]( transaction volume 416K+ unique holders of Zerion DNA NFT 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 Option

s: Contribute to Zerion's success and watch your stock options become valuable.

Travel:

Connect with your teammates around the world at industry events and our annual team offsite.

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.