Backend Developer

Brickken; Barcelona; On-site; EUR 90,000 - 130,000; Full time

Job summary

Lingo is building a cutting-edge digital health platform that fuses continuous biosensor data with high-performance backend engineering to enable real-time insights for healthier living. The backend acts as the heartbeat, transforming biosensor signals into actionable health information for users across global deployments.

We are seeking a Senior Backend Engineer to design, build, and optimize scalable microservices and APIs.

Qualifications

• Experience designing and building backend services for real-time data.
• Strong knowledge of microservices architecture and API design.
• Familiarity with privacy and security requirements (HIPAA/GDPR).

Responsibilities

• Design, develop, and maintain scalable microservices and APIs for real‑time biosensor data processing.
• Implement event‑driven integrations with messaging/streaming systems (Kafka, RabbitMQ).
• Collaborate with SRE to ensure observability, performance, and reliability across backend services.
• Participate in architecture reviews and define service boundaries and data models.
• Optimize backend services for low latency, high throughput, and cost efficiency.

Skills

Backend development

Microservices

APIs

Event-driven systems

Kafka

RabbitMQ

Observability

HIPAA/GDPR compliance

Tools

Kafka

RabbitMQ

Job description

**Senior Software Engineer (Backend)**
**ABOUT LINGO**
Lingo is building a cutting‑edge digital health platform that fuses continuous biosensor data, high‑performance backend engineering, and advanced analytics to help people live healthier, longer, fuller lives. Our systems process massive volumes of real‑time data, and the backend is the heartbeat that transforms biosensor signals into actionable health insights for our users.
**THE OPPORTUNITY**
We're seeking a **Senior Software Engineer** ( **Backend** ) to design, build, and optimize Lingo's backend systems, ensuring they are scalable, resilient, and secure. You will play a pivotal role in implementing high‑performance APIs, event‑driven services, and data integrations across our global deployments. In this role, you'll work closely with Product, Mobile, Platform/SRE, and Data/ML teams to deliver robust cloud‑native services, troubleshoot complex issues, and continuously improve reliability and developer experience. You'll contribute your expertise to architecture discussions, lead implementation of key projects, and mentor junior engineers in best practices.

**WHAT YOU'LL DO**

• Design, develop, and maintain scalable microservices and APIs for real‑time biosensor data processing.
• Implement event‑driven integrations with messaging/streaming systems (Kafka, RabbitMQ) and analytics pipelines.
• Collaborate with SRE to ensure observability, performance, and operational excellence across backend services.
• Participate in architecture and design reviews, contributing to decisions on service boundaries, data models, and communication patterns.
• Optimize backend services for low latency, high throughput, and cost efficiency.
• Apply privacy‑by‑design and security standards in line with HIPAA/GDPR compliance requirements.