Backend Engineer

Job Description:

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 of the platform.

THE OPPORTUNITY
Build and optimize scalable, high-performance backend services that power Lingo’s real-time biosensor platform. You’ll design multi-region services on Kubernetes and service meshes, integrate streaming systems for real-time data, and ensure security and compliance for a regulated digital health environment.

What You’Ll Do

• Design, build, and optimize microservices for IoT-scale data ingestion and real-time analytics
• Implement robust APIs and data processing pipelines, apply best practices in REST and event-driven API design in a distributed architecture
• Integrate high-throughput messaging/streaming for real-time transport and processing
• Design services for multi-region deployments using Kubernetes and service meshes to achieve reliability, security, and traffic control
• Ensure security and data protection across backend services; work within HIPAA/GDPR expectations and auditable controls in partnership with Security and Compliance
• Collaborate with frontend/mobile, DevOps/Platform, and Data teams to align backend capabilities with product goals and analytics needs
• Contribute to architecture reviews and promote technical excellence and high code quality standards
• Measure and improve performance and reliability (latency, throughput, error rates), and support observability, incident response, and capacity planning

Required Qualifications

• 6+ years of backend engineering with a strong focus on distributed systems and microservices
• Deep expertise in Java/Spring Boot and/or Kotlin; experience with relational and NoSQL databases
• Proven experience with cloud-native architectures, Kubernetes, and service mesh technologies in production
• Strong knowledge of API design (REST, GraphQL) and event-driven architectures
• Familiarity with high-throughput messaging (Kafka, RabbitMQ) and data storage (eg.: Postgres, Cassandra)
• Security-first mindset, experience building compliant, auditable services in regulated contexts
• Effective collaboration skills, ability to lead technical discussions, mentor teammates, and work in agile environments 

Preferred Qualifications

• Experience in digital health, IoT, or regulated industries
• History of delivering high-availability, low-latency systems in production
• Experience with observability (metrics, logs, tracing) and performance tuning at scale
• Multi-region reliability patterns, API gateways, and rate limiting 

LINGO CULTURE
Our Culture Compass guides everything: Customer First, Quality, Growth, Unity. As a Senior Backend Engineer, you’ll ensure data quality and trust underpin every product decision and customer experience we deliver.

The base pay for this position is

N/A

In specific locations, the pay range may vary from the range posted.

Job Family:

Product Development

Division:

LNGO Lingo

Location:

Spain > Barcelona : Av. Diagonal, 601

Additional Locations:

Work Shift:

Standard

Travel:

Not specified

Medical Surveillance:

Not Applicable

Significant Work Activities:

Not Applicable