Remote Backend Developer jobs open to Spain.

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.

5 years of experience, AI/ML systems, Inference pipelines, Prototype rapidly, Backend services architecture, Systems thinking, 0→1 environment comfort

KrakenKraken is a financial platform where individuals and institutions trade crypto, stocks, ETFs, and futures.

Go · Rust

Distributed databases/query engines, Golang or C++ or Rust, multi-tenant SaaS, in-person onboarding

Grafana LabsGrafana Labs builds Grafana Cloud and develops open-source observability projects including Grafana, Loki, Tempo, and Mimir.

Go · Rust

Distributed databases/query engines, Golang or C++ or Rust, multi-tenant SaaS, in-person onboarding

Grafana LabsGrafana Labs builds Grafana Cloud and develops open-source observability projects including Grafana, Loki, Tempo, and Mimir.

Go · Rust

Distributed databases/query engines, Golang or C++ or Rust, multi-tenant SaaS, in-person onboarding

Grafana LabsGrafana Labs builds Grafana Cloud and develops open-source observability projects including Grafana, Loki, Tempo, and Mimir.

Python

~1 year production software engineering, Python, European work authorization, B2B contract, 40+ hours/week

KalepaKalepa builds AI-powered underwriting software that helps commercial insurers assess risks and manage decisions from submission through portfolio management.

Go · Rust

Distributed databases/query engines, Golang or C++ or Rust, multi-tenant SaaS, in-person onboarding

Grafana LabsGrafana Labs builds Grafana Cloud and develops open-source observability projects including Grafana, Loki, Tempo, and Mimir.

Java

5+ years backend, Java, Spring Boot, card issuing/payments, out-of-hours on-call

BVNKBVNK is a UK-based fintech B2B platform specializing in stablecoin payment infrastructure, enabling businesses to send, receive, and convert currencies globally.

Go · Rust

Distributed database/query engines, Golang/C++/Rust, catalogs and table formats, AI data systems

Grafana LabsGrafana Labs builds Grafana Cloud and develops open-source observability projects including Grafana, Loki, Tempo, and Mimir.

Production-grade software, AI technologies, LLMs, Prompt engineering, Cloud-native environments, Observability tools, Multi-tenant architecture, Context management systems, Scalable SaaS solutions

Grafana LabsGrafana Labs builds Grafana Cloud and develops open-source observability projects including Grafana, Loki, Tempo, and Mimir.

Production-grade software, AI technologies, LLMs, Prompt engineering, Cloud-native environments, Observability tools, Multi-tenant architecture, Context management systems, Scalable SaaS solutions

Grafana LabsGrafana Labs builds Grafana Cloud and develops open-source observability projects including Grafana, Loki, Tempo, and Mimir.

Production-grade software systems, AI technologies, LLMs, Prompt engineering, Cloud-native environments, Observability tools, Multi-tenant architecture, Context management systems, Scalable SaaS solutions

Grafana LabsGrafana Labs builds Grafana Cloud and develops open-source observability projects including Grafana, Loki, Tempo, and Mimir.

Production-grade software, AI technologies, LLMs, Prompt engineering, Cloud-native environments, Observability tools, Multi-tenant architecture, Context management systems, Scalable SaaS solutions

Grafana LabsGrafana Labs builds Grafana Cloud and develops open-source observability projects including Grafana, Loki, Tempo, and Mimir.

Production-grade software systems, AI experience, LLMs, Prompt engineering, Cloud-native environments, Observability tools, Multi-tenant architecture, Context management systems

Grafana LabsGrafana Labs builds Grafana Cloud and develops open-source observability projects including Grafana, Loki, Tempo, and Mimir.

3 years of experience, LLMs, CUDA-X APIs, API design, High-quality code, AI-assisted software engineering, Code generation, Programming language design

NVIDIANVIDIA builds accelerated-computing platforms for AI, data centers, gaming, robotics and autonomous vehicles.

Python

Enterprise SaaS administration (1,000+ seats), Python or comparable language, Integrating LLM and SaaS APIs, Identity and access management (Okta, OAuth, SCIM, SSO), Operational discipline (intake queues, SLAs), Teaching ability for technical concepts, Clear written communication for documentation, Judgment on capability needs

KrakenKraken is a financial platform where individuals and institutions trade crypto, stocks, ETFs, and futures.

Python · Rust · Ruby

Linux build toolchains, Container images, Debian/RHEL packaging, Continuous integration systems, Shell scripting, Cloud provider experience, Ruby/Go/Python/Rust

GitLabGitLab provides a DevSecOps platform for planning, building, securing and delivering software.

GraphQL

7 years of experience, Agentic systems, Durable execution engine, Multi-tenant platforms, Third-party API integration, Security control planes, PostgreSQL and Neo4j, GraphQL backends, Observability tooling, Prompt injection awareness

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 · Rust

Go, Kotlin, Rust, Python, SQL, Orchestration systems, Data lifecycle management, Schema evolution, Data correctness, Stateful stream processing, Distributed systems, AI tools proficiency, Clear written communication

DuneDune is a remote-first B2B SaaS platform specializing in multi-chain crypto data analytics, empowering developers and investors with insights into blockchain ecosystems.

JavaScript · PHP · SQL

PHP 8, Laravel, JavaScript, CSS, HTML, Debugging, Incident response, Root-cause analysis, Relational databases, SQL, Git, CI/CD, Autonomous work, Professional English (B2+)

Intel 471Intel 471 is a Wilmington, DE-based B2B cybersecurity company specializing in SaaS-based cyber threat intelligence solutions for enterprises and government agencies worldwide.

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 provides an AI-native data security platform for protecting data across human and AI-agent workflows.

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 family of mission-driven organizations behind Firefox, Thunderbird, open-source AI tools and public-interest technology initiatives.

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

Larian StudiosLarian Studios is a Ghent-based video game developer and publisher specializing in high-quality RPGs like Baldur's Gate 3, operating primarily in a B2C model with a global target market.

Go · GCP · Kubernetes

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

ESL FACEIT GroupESL FACEIT Group creates esports tournaments, leagues, and live events for players and fans.

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

GameloftGameloft SE is a Paris-based B2C video game developer and publisher specializing in mobile, PC, and console games, targeting global consumers with popular titles like Asphalt and Disney Dreamlight Valley.

C++, algorithms, object-oriented programming, Intermediate English

AprioritApriorit is a US-based cybersecurity-focused B2B software engineering company specializing in custom development services for tech enterprises, startups, and Fortune 500 clients, with additional offices in Poland and Cyprus.

Java

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

KingKing is a leading interactive entertainment company headquartered in Stockholm, specializing in mobile gaming with iconic titles like Candy Crush, serving over 200 million monthly active users globally.

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.

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.