Top Software Engineer Jobs in Barcelona

The Senior Software Engineer will collaborate in small teams to develop and maintain backend and frontend components, focusing on high-availability systems, writing tests, and continuous delivery on Google Cloud Platform.

Design and develop core backend components for a blockchain network using Rust, ensuring reliability and scalability in production-grade software.

Design, build, and maintain high-performance services for Database & Streaming provisioning systems, collaborating with teams to enhance automation and developer experience.

As a Lead Software Engineer, you'll design and maintain backend services, scale systems, and collaborate on innovative architectural solutions in an agile environment, focusing on observability tools.

The Software Quality Engineer will execute manual and automated tests, document defects, enhance testing processes, and collaborate in an agile environment to ensure software quality for macOS applications.

Design, build, and maintain APIs and systems at Telnyx, debug production issues, improve engineering standards, and collaborate across teams.

Lead and own platform architecture across Infrahub ecosystem, implement high-impact architectural improvements, reduce technical debt, champion AI-first engineering, provide hands-on technical leadership, mentor engineers, and collaborate with product and leadership to ensure scalable, extensible systems.

Build and own end-to-end features across Sona’s platform using AI-assisted development. Direct and correct agent-produced code, work cross-functionally, engage customers in discovery and workshops, and contribute across scheduling, payroll, HR, and mobile domains.

Own and improve core scraping and job-execution infrastructure for high-throughput distributed workloads. Design fault-tolerant, observable systems, lead reliability and scaling efforts, define SLAs, run incident response, mentor engineers, and contribute to architecture decisions to maximize throughput and platform availability.

Build and architect Alpaca's advisory services (block trading, portfolio management, IRA). Design scalable, low-latency distributed systems, write full-stack code, optimize throughput, work with messaging systems and OMS, and implement high-availability, concurrency-safe solutions for financial trading/exchange workloads.

Build and maintain core post-trade clearing systems and securities-finance infrastructure. Own projects end-to-end, design reliable distributed services and RESTful APIs, integrate new clearing partners, participate in on-call rotation, and improve systems to enable new product offerings.

As a Senior Software Engineer, you'll design and build scalable market data systems, improve API architecture, and enhance overall system performance, contributing to Alpaca's infrastructure for trading financial assets.

Design, build, and maintain RESTful, asynchronous microservices and APIs for internal and external customers. Optimize service performance at scale, deliver high-quality code reproducibly, and evolve the Service Delivery platform while collaborating across teams to drive features to completion.

Join a portfolio company as a Software Engineer to work on a performance-sensitive stack for crypto's dark pool, focusing on full onchain systems.

The Senior Software Engineer will build API interfaces, backend infrastructure, and Ruby on Rails applications, collaborate with teams, and improve existing systems.

Lead design and implementation of core Elasticsearch search and indexing capabilities. Research retrieval algorithms and data structures, define technical vision, mentor engineers, collaborate across teams, and optimize large-scale search and distributed systems for performance and relevance.

Lead design and implementation of vector similarity search features in Elasticsearch, improve relevance and performance, fix bugs, invent or implement algorithms/data structures, collaborate with a distributed team, review and triage community contributions, and write idiomatic modern Java.

Maintain and optimise CI/CD systems, shape CI/CD strategy, improve security and compliance, implement pipeline security checks, standardise pipelines, mentor engineers, contribute to roadmap prioritisation, and manage incidents and production deployment stability.

Lead the development of software solutions for a logistics platform, overseeing technical strategy, mentoring teams, and ensuring high-quality software delivery.

As a Senior Software Engineer, you will collaborate with product teams to optimize systems, design APIs, and ship cloud functions using Kotlin.

As a Mid-Senior Software Engineer at Smadex, you will design and implement features, ensure code quality, and maintain system performance in a collaborative environment.

Design and develop services for automating work with a large server fleet while engaging in DevOps processes.

Design and develop services for monitoring servers, improve metrics pipelines, automate maintenance workflows, and investigate incidents to ensure infrastructure reliability.

Develop reliable cloud services on the hyperscaler platform, contributing to cloud infrastructure, databases, and monitoring systems. Must write reliable code with team-oriented skills.

Design and build backend systems for Quadrivia's clinical AI platform, ensuring reliability, high availability, and compliance with healthcare regulations while collaborating with cross-functional teams.