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.

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. Mentor junior engineers through code reviews, pair programming, and knowledge sharing sessions.

Troubleshoot production issues and contribute to incident response and post‑mortem analysis.

REQUIRED QUALIFICATIONS + 5‑8 years of backend engineering experience with distributed,



cloud‑native systems. + 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. + PREFERRED QUALIFICATIONS + Experience integrating backend services with analytics and machine learning pipelines. + Exposure to API gateways, authentication/authorization patterns, and rate limiting strategies. + Background in digital health, IoT, or other mission‑critical platforms. + Familiarity with cloud platforms (Azure/AWS/GCP) and infrastructure‑as‑code tooling (Terraform, Helm). LINGO CULTURE Customer‑first, quality‑driven, growth‑minded, and united. Why NTT DATA?

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📌 Backend Platform Engineer - Datastore Specialist (Hybrid) (Barcelona)
🏢 A Place For Rover
📍 Barcelona