Senior Python Backend Engineer – Real-Time Health Data

Supersonik seeks Senior Engineers to join our core team in Barcelona. You will tackle complex technical problems, shape product architecture from day one, and thrive in a fast-growing startup. You should be fluent in modern Python, async programming, and adept at building scalable, event-driven systems. You'll work across frontend to infrastructure to...

King is seeking a Python-focused backend developer in Barcelona to design, build, and operate data-driven services and APIs at scale. You will work across forecasting and analytics workloads, contributing to distributed systems and cloud-native pipelines that power decision-making.Join a collaborative team shaping internal tools and interfaces, integrating...

Thunes is seeking a highly skilled Data Engineer to drive the development and optimization of our data platform in Barcelona. You will design and scale end-to-end data pipelines, manage streaming and batch processing, and ensure data governance and quality across global data products.Join a fintech environment where you will collaborate with cross-functional...

Abacum is seeking a Senior Frontend Engineer to build a multidimensional real-time calculations engine and scalable UI for finance teams. You will join a small, highly collaborative team in an agile environment where ownership and rapid learning are encouraged.You will shape the product by delivering performant interfaces, advanced data visualizations, and...

DescriptionWe are the Intelligent Internet Platform. We connect People, Places and Things anywhere, managing Internet Performance better than anyone else while providing One Global Experience, giving Visibility, Control and Security through expereoOne.Expereo believes in the power of Internet connectivity. As the world's largest provider of...

Appodeal is seeking a Senior Rust Engineer to join our Barcelona team and help build high-performance, real-time backend systems powering our ML-driven AdTech platform. You will work on core infrastructure, feature stores, identity services, and custom inference layers to ensure scalability and reliability.The role emphasizes low-latency, high-load...

ERNI - Swiss Software Engineering is seeking a senior data platform expert to design and implement scalable end-to-end data solutions for healthcare analytics. You will leverage Databricks, PySpark, SQL and Azure to build data pipelines, analytical models and business-facing data products that support near real-time and batch processing.You will work in a...

One of the companies we work with at Joppy is looking for a Backend Engineer to join the team. Work modality: HYBRID in Barcelona (3 days/week at office). We're looking for an experienced backend engineer with depth. You'll come from a Backend Engineering background - Python, APIs, distributed systems - but what matters most is your motivation to build...

About UsCareerOS is a B2B2C career platform serving 100+ top MBA programs worldwide - including Oxford, INSEAD, London Business School, Georgetown, and Notre Dame - along with 30+ employers. We help 500K+ users land jobs they love, and we're growing with real revenue (not just runway).We're a small, high-output team of 5 engineers based in Barcelona, scaling...