Remote Backend Developer jobs open to Spain.

Rust · Kubernetes

5 years of experience, Rust, Kubernetes Control Planes, DPU architectures, Datacenter Networking, gRPC/Protobuf, OpenTelemetry, async concurrency models, mock-driven testing, custom Kubernetes operators, high-density infrastructure

MirantisMirantis is a Campbell, California-based B2B company specializing in open source cloud computing and Kubernetes-native AI infrastructure, serving diverse sectors including automotive, healthcare, and financial services.

PHP

PHP, SOLID principles, NoSQL (Redis, MongoDB), AI-assisted engineering tools, Cloud-native infrastructure, High-volume transaction applications, Technical documentation, Agile environment, Problem-solving mindset, Empathy in teamwork

Java · AWS

5 years of experience, Java 7, Java 8, Oracle, Progress, Liquibase, AWS, Enterprise application design, Object-oriented programming, Agile methodologies, Oil & Gas Upstream knowledge

Netrix GlobalNetrix Global is a global B2B IT consulting and managed services company headquartered in an unspecified location, specializing in cybersecurity, cloud migration, and digital workplace solutions for various industries.

Python

8 years of experience, Active Directory attack expertise, Offensive security experience, Python programming, AD tradecraft knowledge, Technical leadership, Research skills in cybersecurity, Experience with modern hardened environments, Mentoring attack engineers, SCCM attack experience, Hybrid identity attack experience

Horizon3 AIHorizon3.ai is a remote cybersecurity company specializing in the NodeZero autonomous pentesting SaaS platform, serving global enterprises and federal agencies in the B2B sector.

Ruby

3 years of experience, Ruby on Rails, PostgreSQL, REST APIs, Sidekiq, Scalable backend development, Debugging, Performance optimization, Clean code practices

2 years of experience, Technical document analysis, Cloud infrastructure experience, Attention to detail, Ability to interpret technical concepts, Experience reviewing engineering reports, Familiarity with technical architecture documentation

Python · AWS · Kubernetes

4 years of experience, Python, Go, PostgreSQL, AWS, Docker, Kubernetes, Event-driven architectures, Kafka, Graph database, Cybersecurity background, Data encryption patterns

Horizon3 AIHorizon3.ai is a remote cybersecurity company specializing in the NodeZero autonomous pentesting SaaS platform, serving global enterprises and federal agencies in the B2B sector.

Python · Kotlin · AWS

8 years of experience, Python, Kotlin, AWS, MySQL, Spark, Kubernetes, Distributed systems, Technical strategy, KYC Verification, Identity Data Management, Global regulatory compliance

AffirmAffirm is a U.S.-based fintech company offering a buy now, pay later (BNPL) service that allows consumers to make purchases in installments, primarily targeting the retail sector with both B2C and B2B business models.

GraphQL · SQL · AWS

7 years of experience, EDR platform familiarity, GraphQL backend development, Third-party API integrations at scale, ETL pipeline development, Cloud platform experience (AWS, Azure, GCP), SQL expertise, Technical documentation skills

Horizon3 AIHorizon3.ai is a remote cybersecurity company specializing in the NodeZero autonomous pentesting SaaS platform, serving global enterprises and federal agencies in the B2B sector.

Linux kernel development, x86 computing architecture, Virtualization technologies, Open-source software development, Performance optimization, Low-level debugging tools, Memory management, Collaboration with open-source communities

AWS · Kubernetes · Docker

5 years of experience, Distributed backend systems, Web3 platform components, AI-assisted workflows, Strong ownership mindset, Client collaboration, Fast-paced startup environment, High code quality standards, Algorithms and data structures, Containerized systems: Docker & Kubernetes, AWS

ZerionZerion is a decentralized finance (DeFi) platform and Web3 wallet that enables global crypto investors to manage, trade, and track their assets across multiple blockchain networks.

Unreal Engine, C++, Streaming solutions, Memory system, Physics (ChaosPhysics), World building tools, AAA title experience, Multithreaded programming, System architecture, Debugging and optimization

CD PROJEKT REDCD PROJEKT RED is a Warsaw-based video game developer specializing in story-driven RPGs, including The Witcher series and Cyberpunk 2077, operating primarily in the B2C gaming industry with a global target market.

Unreal Engine, C++, Streaming solutions, Memory system, Physics (ChaosPhysics), World building tools, Multithreaded programming, System architecture, Debugging and optimization

CD PROJEKT REDCD PROJEKT RED is a Warsaw-based video game developer specializing in story-driven RPGs, including The Witcher series and Cyberpunk 2077, operating primarily in the B2C gaming industry with a global target market.

6 years of experience, C#/.NET, C++, Unreal Engine, Multi-threaded architectures, Networking protocols, Database technologies, Networked applications, Network optimization

Python

5 years of experience, Strong Python, AI-assisted development, Healthcare experience, Flask, SQLAlchemy, PostgreSQL, Redis

CollectlyCollectly is a San Francisco-based B2B SaaS healthcare technology company specializing in AI-driven patient billing and revenue cycle management solutions for healthcare organizations.

RTL design, CPU architecture, Microarchitecture development, Power-saving techniques, High-speed processor design, Design verification, Synthesis and timing closure, Problem-solving skills

Rust

3 years of experience, Rust, Network services, Asynchronous code, Security-first mindset, Distributed systems, RPC protocols, Kafka, Event-Driven Systems, End-to-end ownership, Mentorship

KrakenKraken is a global fintech B2B and B2C cryptocurrency exchange platform, dedicated to accelerating crypto adoption and headquartered remotely with a presence in over 70 countries.

3 years of experience, Full-stack or backend proficiency, Custom integrations experience, Technical implementation ownership, Technical discovery sessions, C1+ English proficiency

PearlPearl is a dental AI company specializing in SaaS solutions for dental x-ray analysis, headquartered in an unspecified location, operating in the B2B healthtech industry with a global market presence.

TypeScript · React · Node.js

5 years of experience, React, TypeScript, Node.js, REST, GraphQL, MongoDB, CI/CD, iPaaS, AI coding tools, Healthcare integrations, Security awareness

Kubernetes

Kubernetes, Datacenter experience, Distributed systems, Go, Terraform, Crossplane, Cluster-API, Networking components management, Operating code

Grafana LabsGrafana Labs is a San Francisco-based B2B observability platform specializing in open-source IT systems monitoring and data visualization for enterprises globally.

Kubernetes

Kubernetes, Distributed systems, Datacenter experience, Go, Terraform, Crossplane, Cluster-API, Tinkerbell, Talos, Ceph, Networking management

Grafana LabsGrafana Labs is a San Francisco-based B2B observability platform specializing in open-source IT systems monitoring and data visualization for enterprises globally.

Go · AWS · Kubernetes

8 years of experience, Trust Accounting subsystem, Production-grade financial infrastructure, AWS, Kubernetes, CI/CD pipelines, Golang, Financial systems familiarity, Architectural design, Cross-team influence

HostawayHostaway is a USA-based B2B SaaS provider specializing in vacation rental management software, serving property managers with 2-5,000+ properties globally.

Kubernetes

Kubernetes management, Datacenter experience, Crossplane, Terraform, Go, Distributed systems, On-call rotation, Cluster networking management

Grafana LabsGrafana Labs is a San Francisco-based B2B observability platform specializing in open-source IT systems monitoring and data visualization for enterprises globally.

PHP

6 years of experience, PHP, Go, High-traffic systems, Decomposing monoliths, API design, AI coding tools, Cloud environment, Event-driven architecture

HostawayHostaway is a USA-based B2B SaaS provider specializing in vacation rental management software, serving property managers with 2-5,000+ properties globally.

Python · Kubernetes · Docker

7 years of experience, Bash, Python, CI/CD systems, Container image building, Docker, Podman, Kubernetes, Linux systems, Security compliance, Cloud-native compatibility, Open source project contributions

CanonicalCanonical is a London-based B2B open-source software company specializing in Ubuntu and providing commercial support services to global enterprises in sectors like cloud, IoT, and data science.

Java · Kotlin

7 years of experience, Kotlin, Java, Distributed systems, Cloud infrastructure, Platform engineering principles, CI/CD, Observability, AI tools, Web3 passion

OpenseaOpenSea is a Miami-based B2C NFT marketplace specializing in buying, selling, and trading digital assets across multiple blockchains, serving the global crypto collectibles and digital art markets.

Java · Kotlin

7 years of experience, JVM languages (Kotlin, Java), Distributed systems design, Cloud infrastructure, Platform engineering principles, AI tools and workflows, Web3 passion, CI/CD and observability

OpenSeaOpenSea is a leading NFT marketplace headquartered in either Miami or New York, specializing in B2C transactions of digital assets across multiple blockchains in the crypto/Web3 industry.

Python

3 years of experience, Compiler optimizations, MLIR, C/C++, Python, AI workload implementation, LLM inference, Compiler framework design

NVIDIANVIDIA Corporation is a Santa Clara-based technology company specializing in designing GPUs and AI solutions for gaming, professional visualization, and cloud services, operating in both B2B and B2C markets globally.

TypeScript · Node.js

Staff-level architectural ownership, Distributed systems depth, Data architecture at scale, Configurable systems at scale, TypeScript & Node.js depth, Cross-team technical leadership, Platform enablement mindset, Long-horizon engineering

n8nn8n is a Germany-based B2B SaaS workflow automation platform that integrates over 400 tools and services, targeting industries like IT and fintech with a focus on low-code and AI functionalities.

Kubernetes

Go, Distributed systems, Cloud-native microservices, High availability systems, Operational excellence, Kubernetes, CockroachDB, NATS JetStream, CI/CD pipelines, Test automation, End-to-end project ownership

Form3 (via Otta)Form3 is a London-based fintech B2B SaaS provider specializing in Payments-as-a-Service, offering cloud-native payment solutions for financial institutions and regulated fintechs in the UK.