Block Labs - Senior Backend Engineer (Go)

Lisbon, Portugal1mo ago

In Office Senior EMEA Fintech Payments Backend Engineer Senior Backend Developer Go Documentation Kafka

Requirements

• Experience with rules engines, real-time scoring, or decisioning systems. • Background in fintech, real-time gaming and entertainment platforms, or other high-traffic consumer products. • Familiarity with event-driven systems, Kafka, or message queues. • Prior experience designing APIs for multi-tenant or white-label products. • What kind of culture can I expect?Mature, mission-driven, and low-ego. We value clarity over noise, outcomes over theatrics, and pace without chaos. If you’re one of the smartest minds in your craft and want to build with other experts, you’ll feel at home here. • What kind of culture can I expect?

Responsibilities

• Design and build distributed backend services that power player engagement across a multi-tenant platform. • Develop core platform features and services across a broad and evolving set of player-facing domains, from engagement and personalisation to platform integrity. • Consume and process high-volume player activity streams, integrating with internal platforms (payments, game providers, player data) and relevant third-party tools. • Collaborate with product, frontend, data, and infrastructure teams to deliver reliable, end-to-end systems. • Contribute to architectural design and drive technical decisions across services. • Ensure scalability, fault-tolerance, and data integrity, including the correctness guarantees required when balances and player-facing decisions are involved. • Maintain clean, testable, and well-documented Go code following industry best practices. • 6+ years of experience in backend development, ideally on high-throughput, real-time, or consumer-facing systems. • Strong proficiency in Go as a primary backend language; experience with gRPC and RESTful APIs is highly valued. • Solid understanding of distributed systems, multi-tenant architectures, and microservices. • Experience building consumer-facing or platform services where engagement, personalisation, or platform integrity matter is a strong advantage. • Comfortable working in cloud-native environments. • Deep commitment to software reliability, observability, and security best practices. • Excellent communication skills and a collaborative mindset.