Senior Backend Engineer, Web3 & Fintech (Remote EU)

IntellectEU; Portugal; Remote; EUR 90,000 - 120,000; Full time

Job summary

IntellectEU is seeking a Senior Software Engineer to join our high-caliber Web3 backend team. You will own the delivery of core services powering wallet operations, asset transfers, and blockchain integrations in regulated environments.

Location: EU-remote with some overlap with EDT; you will collaborate across teams, write well-tested code, and drive architectural decisions for scalable, secure, event-driven systems using Kafka and OpenTelemetry.

Qualifications

• 7+ years of backend software engineering in regulated environments.
• Deep Java and Spring Boot expertise; comfortable with polyglot stacks.
• Strong API-first design and microservices experience.
• Proficient in asynchronous, concurrent, and multi-threaded programming.
• Track record delivering highly available distributed applications.
• Hands-on with event-driven architectures using Apache Kafka.
• CI/CD, DevSecOps practices and secure SDLC fundamentals.

Responsibilities

• Implement and operate core backend services with fault tolerance, security, and scalability.
• Build API-first services integrating blockchain networks and providers.
• Implement secure service communications using cryptographic methods and zero-trust principles.
• Operate event-driven systems using Kafka and asynchronous messaging patterns.
• Produce documentation, API specs, and runbooks; ensure high test coverage.

Skills

Java

Spring Boot

API design

Distributed systems

Kafka

CI/CD

Security

Tools

Apache Kafka

OpenTelemetry

CI/CD tooling

Job description

IntellectEU is seeking a Senior Software Engineer to join our high-caliber Web3 backend team. You will own the delivery of core services powering wallet operations, asset transfers, and blockchain integrations in regulated environments.

Location: EU-remote with some overlap with EDT; you will collaborate across teams, write well-tested code, and drive architectural decisions for scalable, secure, event-driven systems using Kafka and OpenTelemetry.