Top Software Engineer Jobs in Spain

Leads the design and delivery of scalable full-stack software, with a strong frontend focus using React, TypeScript, and Next.js. The role influences architecture, engineering standards, cloud and platform direction, and modern practices such as CI/CD, testing, observability, and DevSecOps. It involves mentoring engineers, partnering with product and architecture stakeholders, supporting production platforms, and contributing to customer channels, data services, and AI-enabled business banking experiences.

Build AI agents, reusable agent platforms, and automated workflows across the software development lifecycle. Develop integrations with codebases, APIs, MCPs, internal tools, and engineering systems. Prototype and scale AI capabilities, while designing context management, orchestration, verification, and human-in-the-loop mechanisms for safe, reliable automation. Measure agent effectiveness and collaborate with engineering, product, design, and data teams to identify automation opportunities and drive adoption.

Develop and maintain highly available, scalable API services for a global payments platform. Design and ship new products, improve platform performance, automate development processes, and deliver secure, testable, documented software. Collaborate with international technology teams and stakeholders while applying Agile practices, evaluating technologies, and supporting reliable 24/7 transaction processing.

Design and develop clean, maintainable software for automated document-processing products. Collaborate with business stakeholders to translate requirements into product improvements, conduct code reviews, guide technical direction, mentor colleagues, and improve engineering practices. The role uses Golang, MySQL, Docker, Kubernetes, cloud infrastructure, and GitHub CI/CD while emphasizing product ownership, clean architecture, software craftsmanship, and technical communication.

Design, build, and ship production-grade full-stack software integrated with agentic AI systems and LLM APIs. Use AI-assisted development throughout the software lifecycle, evaluate AI-generated outputs, and manage reliability, latency, token, and cost considerations. Own delivery from design through production support, track AI productivity KPIs, collaborate in Agile client environments, and contribute reusable components, knowledge bases, and AI tooling standards.

Build and own React Native features for Kraken’s consumer mobile app, from product discovery through launch, measurement, and iteration. Partner with Product and Design to create responsive, trustworthy financial experiences using dynamic or real-time data. Guide development for a new Asian-market app, including regional UX, connectivity restrictions, vendors, and telemetry. Contribute to architecture, performance, reliability, code reviews, and product engineering standards.

Owns the CI/CD and release infrastructure roadmap, technical vision, security gates, artifact provenance, and organizational adoption. Directs engineers through complex, multi-quarter projects, leads incident response for supply-chain and release issues, and raises engineering standards through mentorship and reviews. Remains hands-on with code, prototyping, debugging, and production issues while improving developer productivity, release safety, and infrastructure scalability.

Lead the modernization of business-critical legacy PHP systems into scalable Node.js and Next.js architectures. Provide hands-on coding, architectural guidance, API and microservices design, debugging, refactoring, and incremental migration leadership. Translate undocumented business logic into maintainable solutions, leverage AI-assisted development tools, communicate trade-offs to stakeholders, establish engineering standards, and mentor additional engineers.

Provide technical leadership for secure, scalable payment platforms and distributed systems. Lead architecture and design decisions, modernize cloud-native and event-driven platforms, champion software quality, security, resilience, observability, and DevSecOps, and own solutions through production operations. Mentor engineers, influence technical standards across teams, and help develop AI-enabled engineering practices for customer self-onboarding and Payment API experiences.

Build and ship backend features for enterprise Coder deployments, including database migrations, observability, reporting, auditing, security, scalability, and reliability improvements. Investigate production issues, resolve operator problems, document designs, participate in code reviews and RFC discussions, and join on-call rotations. The role requires professional Go development, concurrency knowledge, SQL expertise, debugging ability, and strong communication.

Design, implement, test, deploy, maintain, and improve backend software components for medical software used by surgeons worldwide. Collaborate with product managers, analysts, architects, and engineers to develop high-quality features, apply testing methodologies such as unit testing and TDD, improve team productivity through internal tools, and contribute to technical discussions and product quality.

Provide technical leadership across engineering squads, define architecture and engineering standards, and design secure, scalable distributed payment platforms. Build cloud-native, event-driven software using modern delivery practices; drive quality, testing, observability, security, and operational excellence. Own solutions throughout their lifecycle, mentor engineers, lead modernization initiatives, and collaborate with product, architecture, security, and operations teams.

Design and build reliable, scalable backend services, search APIs, semantic and lexical search systems, and platform components serving millions of users. Collaborate with engineering, product, and QA teams to translate requirements into solutions, while improving observability, monitoring, alerting, and operational readiness. Support multi-region systems using CI/CD, infrastructure as code, containers, high availability, and disaster recovery practices.

Senior Software Engineer on Elastic’s Elasticsearch Performance team, developing and implementing code- and architecture-level optimizations for distributed search systems. Responsibilities include profiling, benchmarking, regression detection, performance modeling, vector search optimization, and building AI-assisted optimization tools. The role requires deep Java and JVM expertise, concurrency knowledge, distributed systems experience, and collaboration across engineering teams.

Own end-to-end B2B merchant product initiatives, from understanding problems and defining hypotheses through building, shipping, measuring, and iterating. Work across backend and frontend production software, collaborate directly with merchants and stakeholders, make product and technical decisions amid ambiguity, and use data, experimentation, and AI-assisted development to deliver outcomes.

Design and implement cloud-native microservices for the Miles Enterprise platform. Translate domain models into service architectures, build RESTful APIs, design databases and ORMs, apply CI/CD and containerization, prioritize security in SSDLC, collaborate with API consumers, and mentor junior engineers.

Leads the design and delivery of scalable software, APIs, services, platforms, and data-enabled solutions for Business Banking customer and colleague experiences. Influences architecture and engineering standards, applies cloud-native and DevSecOps practices, supports production platforms, mentors engineers, and partners with product, business, and architecture stakeholders. Work may span customer channels, CRM, data services, AI-enabled experiences, and shared platform capabilities.

Build and maintain backend collections systems to manage delinquent loans, implement recovery strategies, ensure high availability and reliability, collaborate with product and risk teams, participate in on-call rotation, write well-tested extensible code, and contribute to team growth.

Build front-end experiences and backend services for integrating prediction markets into MetaMask. Develop scalable APIs, real-time data feeds, transaction signing, and secure on-chain protocol integrations. Optimize performance, security, and high-volume transaction throughput across mobile, web, and browser clients while collaborating within an agile, distributed engineering team.

Develop and guide the architecture of native iOS applications using Swift and SwiftUI. Lead technical discussions, establish software development and testing processes, address technical debt, evaluate frameworks and scalable approaches, and collaborate with product teams on business-aligned solutions. The role also includes mentoring engineers, applying design patterns and API design, using Git and DevOps practices, and exploring AI tooling, cloud services, GraphQL, and Firebase.

Develop cross-platform C++ mapping SDK components for native applications, visualization, sensor networks, navigation, and Unity and Unreal Engine integrations. Responsibilities include designing software with modern C++ standards and patterns, extending core components through plugin APIs and UI, writing unit tests, collaborating in an agile team, and continuously improving technical skills.

Build and operate backend pricing systems for real energy contracts. Responsibilities include designing the Pricing API, consolidating pricing logic, improving quote speed, implementing error handling and observability, creating alerting, explaining pricing failures, and supporting live incidents. The role requires production Python backend experience, FastAPI, SQL, data-heavy systems, end-to-end project ownership, and AI-assisted development workflows.

Own and develop low-level systems powering cloud-based scientific workloads across Fusion, Fusion Snapshots, Ignite, and Sched. Build reliable systems software in Go and C, work with Linux internals, filesystems, namespaces, process supervision, checkpoint/restore, and multi-cloud orchestration. Lead performance engineering, testing, observability, and operational excellence while mentoring engineers and shaping technical direction.

Own the backend application layer for compute provisioning, cloud and HPC integrations, usage metering, billing, and customer onboarding. Design APIs and data models, integrate AWS, Azure, GCP, Kubernetes, and GPU environments, improve observability and failure handling, and support production customers. Collaborate with product, platform, infrastructure, and support teams while making architecture decisions and documenting systems.

Design, implement, and operate fault-tolerant distributed systems and foundational platforms at internet scale. Build horizontally scalable, multi-tenant services that ingest, store, analyze, and query billions of events per second. Develop backend systems using Go, Java, Rust, or C++, alongside Kafka, Redis, Cassandra, Elasticsearch, and other open-source technologies. Own production services, optimize durability, availability, latency, performance, and operability, and use AI coding tools effectively.