High-Throughput Blockchain API Backend Engineer — Hybrid, Bucharest, Romania

Overview

Build and operate high-throughput backend services that connect applications to blockchain data and networks. Work on system architecture, latency improvements and production reliability, collaborating with engineers on distributed infrastructure.

Requirements

• At least five years of relevant professional backend software engineering experience.
• Bachelor's degree in computer science or equivalent practical engineering experience.
• Production experience with Java and Rust for backend services.
• Experience designing, building, scaling and maintaining core distributed backend infrastructure and APIs.
• Ability to solve difficult throughput, latency, availability and performance problems in high-load production systems.
• Hands-on cloud-native engineering, particularly AWS environments.
• Ability to own architecture and services throughout their lifecycle, including tests, benchmarks and operational debugging.
• Comfort working across platform infrastructure and application stacks, influencing technical direction and shipping improvements.
• Managed Kubernetes or Amazon EKS, prior Web3, startup work and independent engineering projects are advantageous, not mandatory.

Responsibilities

• Design, build and maintain high-throughput blockchain infrastructure and low-latency APIs.
• Own distributed service architecture and implementation decisions.
• Improve scalability, performance, service availability and reliability.
• Validate performance through automated tests, benchmarking and production metrics.
• Trace production failures across service boundaries and implement durable fixes.
• Lead backend system-design reviews and establish technical quality standards.
• Coordinate with platform and infrastructure engineers on cloud operations and service lifecycle ownership.

Conditions

• Full-time hybrid position in Bucharest, Romania.