Senior Backend Engineer – Real-Time Biosensor Data

Hedon Technologies; Barcelona; On-site; EUR 75,000 - 110,000; Full time

Job summary

Lingo is building a cutting-edge digital health platform that processes real-time biosensor data with high-performance backend engineering. As a Senior Backend Engineer, you will design, implement, and optimize scalable microservices and APIs that power live health insights for users.

You will collaborate with Product, Mobile, Platform/SRE, and Data/ML teams to ensure security, observability, and reliable delivery, while mentoring juniors and upholding coding standards in a HIPAA/GDPR compliant

Qualifications

• 5-8 years of backend engineering experience with distributed, cloud-native systems.
• Strong skills in microservices architecture and API design (REST; familiarity with GraphQL/gRPC is a plus).
• Experience with Kubernetes in production environments and familiarity with service mesh concepts.
• Hands-on proficiency with messaging/streaming systems such as Kafka or RabbitMQ.
• Programming expertise in backend languages such as Java, Kotlin, Python.
• Knowledge of secure coding practices and compliance requirements (HIPAA, GDPR, or similar).
• Solid understanding of performance optimization, scalability patterns, and async data processing.
• Strong collaboration and communication skills; ability to work cross-functional with other engineering and product teams.

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) 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.
• Write clean, maintainable, and testable code; establish and uphold engineering standards within the team.
• Mentor junior engineers through code reviews, pair programming, and knowledge sharing sessions.
• Troubleshoot production issues and contribute to incident response and post-mortem analysis.

Skills

Backend engineering

Distributed systems

Microservices

REST API design

GraphQL / gRPC familiarity

Kubernetes in production

Messaging systems (Kafka, RabbitMQ)

Java

Kotlin

Python

Security best practices HIPAA GDPR

Performance optimization

Asynchronous data processing

Cross-functional collaboration

Tools

Kubernetes

Kafka

RabbitMQ

Terraform

Helm

GCP

AWS

Azure

Job description

Lingo is building a cutting-edge digital health platform that processes real-time biosensor data with high-performance backend engineering. As a Senior Backend Engineer, you will design, implement, and optimize scalable microservices and APIs that power live health insights for users.

You will collaborate with Product, Mobile, Platform/SRE, and Data/ML teams to ensure security, observability, and reliable delivery, while mentoring juniors and upholding coding standards in a HIPAA/GDPR compliant