Remote Backend Developer jobs open to Spain.

GCP · Kubernetes

Go, Kubernetes, Large-scale backend development, Microservices architecture, Performance analysis, Security product architecture, GCP services, Distributed systems optimization, API integration with SaaS applications

CyberhavenCyberhaven is a remote-based B2B cybersecurity company specializing in AI-powered data protection and advanced threat detection for organizations globally.

SQL

Database performance optimization, Strong SQL, Backend engineering, Data architecture design, Lakehouse experience, Schema design for semi-structured data, Streaming ingestion experience, Migration or re-architecture track record

OscilarOscilar is a US-based fintech B2B SaaS provider specializing in AI-native risk decisioning for fraud prevention, credit underwriting, and AML compliance, serving banks and digital organizations.

JavaScript · Python · GCP

5 years of experience, Cloud-native technologies (GCP preferred), Kubernetes, ArgoCD, Terraform, GitHub, Python, JavaScript, Go, Technical leadership, Internal Developer Platforms, Cost optimization

MozillaMozilla is a Mountain View, California-based non-profit organization that develops open-source software, including the privacy-focused Firefox browser and Thunderbird email client, targeting global consumers.

3 years of experience, Metal, DX11, DX12, C++, Objective-C, GPU profiling tools, multithreading, console SDKs, XCode, CPU profiling tools

Go · GCP · Kubernetes

Golang, Architectural vision, Distributed microservices, Domain-Driven Design (DDD), High-scale distributed databases, Google Cloud Platform (GCP), Kubernetes, Mentorship

Python

2 years of experience, C++11/14/17, Software architecture, Object-oriented programming, Mobile/Console programming, Agile environments, Version control (SVN, Git), Online/Networks Libraries, Graphics Engines, AI, Scripting Languages (Lua, Python), POSIX Systems, Code Reviewing, Video game culture

Java

Java, Production backend systems, Established codebases, Automated testing, Medium-sized systems design, UNIX environments, Web development, CI/CD concepts

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

Python · Rust

5 years of experience, Multi-stage data pipelines, Python, Go or Rust, Workflow orchestration, Reliability engineering, Observability experience, Deep CI/CD experience, Object storage experience, State machine design, Excellent debugging skills, Strong communication skills

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.

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.

Python · Java

2 years of experience, Strong Java proficiency, Experience with large-scale data processing, Ability to work directly with clients, Working knowledge of Python, MSc in Computer Science or AI-related field, Strong problem-solving skills, Experience with simulation frameworks or modeling tools, Prior client-facing technical consulting experience

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.