Remote Backend Developer jobs open to Spain.

Java · AWS · Kubernetes

Java 17+, Spring Boot, Microservices, Event-driven architecture, Kafka, MySQL, AWS, Docker, Kubernetes, Payments or fintech experience, AI-native mindset, Ownership and communication, Digital assets experience, Domain-driven design, Workflow orchestration

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

Strong backend engineering, production APIs/cloud/async processing, hands-on AI agent development, some frontend

ElevenLabsElevenLabs builds AI voice, conversational-agent, creative-media, and developer API products.

Python

8+ years software development, deep Python, async code, OpenTelemetry, open source, AI agent instrumentation

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

Python

8+ years software development, deep Python, async code, OpenTelemetry, open source, AI agent instrumentation

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

Python

8+ years software development, deep Python, async code, OpenTelemetry, open source, AI agent instrumentation

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

Go

Staff-level systems software, Golang and C, Linux internals, FUSE or CRIU, multi-cloud distributed systems

SeqeraSeqera develops open-source and cloud software, including Nextflow and Seqera Platform, for scalable data analysis in life sciences.

Python · Java · Go

Golang or similar (Python, Java, C++, Rust), cloud/distributed systems, on-call rotation

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

Java · Kotlin · Kubernetes

Strong backend, Java or Kotlin, microservices, PostgreSQL, Kafka, Kubernetes, fintech/payments a plus

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

Java · Kotlin

7+ years backend, Java/Kotlin, Spring Boot, Kafka, billing/payments/ledger systems

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

Java

Java and Spring Boot backend, event-driven microservices, Kafka, real-time systems, employee contract (no B2B)

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

Go · SQL

7+ years backend, Golang, distributed systems, SQL, based in Europe incl. UK with right to work

Refurbedrefurbed runs an online marketplace for refurbished products, letting customers in 23 European countries buy for less while cutting CO2 emissions.

TypeScript · Go

5+ years backend services in production with on-call, TypeScript or Golang, OAuth/OIDC/JWT, PostgreSQL

SupabaseSupabase is a Postgres development platform providing databases, authentication, storage, APIs and related developer tools.

Python · Kotlin · AWS

8 years of experience, Python, Kotlin, AWS, MySQL, Kubernetes, Correctness-sensitive systems, Data-processing systems, Cross-team collaboration, Technical strategy development, On-call operations management

AffirmAffirm operates a payment network that gives consumers flexible ways to pay and helps merchants grow.

React · Vue · Python

1.5 years of experience, Python, Kotlin, React, Vue, Declarative UI frameworks, Mobile application development, Code review, Debugging, Collaboration with product management, Agile methodology

AffirmAffirm operates a payment network that gives consumers flexible ways to pay and helps merchants grow.

Python

6-7+ years commercial development, Python 3.x, Django, high-load systems, fluent Russian, intermediate+ English

TorreroTorrero provides white-label casino and sportsbook platforms and B2B game aggregation for iGaming operators.

Python

5+ years commercial development, Python 3.x, Django, high-load systems, fluent Russian, intermediate+ English

TorreroTorrero provides white-label casino and sportsbook platforms and B2B game aggregation for iGaming operators.

Python · Go · Kubernetes

5 years of experience, Golang, Python, Kubernetes, AI-assisted coding, Distributed systems

Lemon.ioLemon.io is a Ukraine-based B2B platform connecting startups with vetted freelance developers, offering services globally across various sectors.

Go

Golang or comparable backend language, distributed systems, Kafka, Pub/Sub or SQS messaging

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

Python · SQL · Azure

4 years of experience, Python, FastAPI, Azure, Databricks, REST APIs, SQL Server, Docker, Asynchronous processing, Messaging systems, CI/CD

Mutt DataMuttdata is a data and AI consultancy that builds data platforms and machine learning systems, such as forecasting and recommendation models, for client companies.

Node.js

5+ years backend with Node.js in production, distributed systems, PostgreSQL tuning, observability

SupabaseSupabase is a Postgres development platform providing databases, authentication, storage, APIs and related developer tools.

3+ years Haskell, C, PostgreSQL/plpgsql, open-source contributions, Linux debugging

SupabaseSupabase is a Postgres development platform providing databases, authentication, storage, APIs and related developer tools.

Python · Java · AWS

Java, Python, C++, AWS, Distributed systems, Production backend service ownership, Fluent English, Cloud integration with HPC, Simulation-specific solutions, High-performance computing optimization

Rust · AWS · Kubernetes

Rust, Postgres compatibility, Deterministic Simulation Testing, Formal verification methods, Fuzz testing, Differential testing, AWS, Kubernetes, Embedded databases, Remote team collaboration, Cloud systems observability, Cloud systems reliability, Cloud systems performance

SupabaseSupabase is a Postgres development platform providing databases, authentication, storage, APIs and related developer tools.

Python · Rust · Kubernetes

Expert Rust (Tokio), search engine internals, distributed data systems, Python/PyO3, Kubernetes

Progress Software CorporationProgress Software is a Nasdaq-listed provider of software that helps businesses develop, deploy and manage AI-powered applications and digital experiences.

Python · GCP

5 years of experience, Python, Bash, Data pipelines, Large-scale data processing, Cloud infrastructure, GCP, Terraform, Web crawlers, Audio processing

SpeechifySpeechify is an AI-powered text-to-speech SaaS platform headquartered in the US, focusing on accessibility and productivity for a global audience.

Python · GCP

5 years of experience, Python, Bash, Data pipelines, Large-scale data processing, Cloud infrastructure, GCP, Terraform, Web crawlers, Audio processing

SpeechifySpeechify is an AI-powered text-to-speech SaaS platform headquartered in the US, focusing on accessibility and productivity for a global audience.

TypeScript · Python · Java

Open Source Contributions, Backend Development and API Design, Python, Java, C++, Go, Rust, TypeScript, Debugging and Troubleshooting, Automated Testing and Code Validation, Performance Optimization

Weekday AIWeekday provides AI-assisted candidate sourcing and recruiting services for employers.

JavaScript · Rust · AWS

3 years of experience, PostgreSQL Expert, Nix packaging, Ansible, Docker, AWS, Kubernetes, C/C++ builds, Go, JavaScript, Rust, Infrastructure management, Customer engagement, Proactive problem-solving

SupabaseSupabase is a Postgres development platform providing databases, authentication, storage, APIs and related developer tools.

7 years of experience, Advanced modern C++ (C++23 or newer), Large-scale C++ codebases, Memory management, Concurrency, Performance profiling, Experience shipping software to a large consumer audience, Comfort with large build systems, Algorithms and data structures

DuckDuckGoDuckDuckGo is a Paoli, Pennsylvania-based privacy technology company offering a privacy-focused search engine and browser solutions for a global audience.

Python

5 years of experience, Trust & Safety systems, Python, Distributed systems, Cloud applications, End-to-end system ownership, APIs design, Collaboration with non-technical stakeholders, Problem-solving in ambiguous situations

ElevenLabsElevenLabs builds AI voice, conversational-agent, creative-media, and developer API products.