Senior Full-Stack Engineer: Backend & SDK Lead (Remote)

Once For All - Nalanda; Madrid; Presencial; EUR 40.000 - 65.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Flexible hours

Teleworking

Growth opportunities

Inclusive culture

Descripción de la vacante

Nalanda, part of Once For All, seeks a Senior Full Stack Engineer with deep Java/Spring Boot backend and a strong TypeScript SDK frontend. You’ll own backend services, Kafka-driven data flows, and the SDK that exposes document data to clients. Expect cross-country collaboration and modern cloud infra.

You’ll contribute to architecture, tooling, and deployment, while mentoring engineers and shaping platform standards across Spain, France, and the UK.

Formación

• 5+ years backend engineering with Java 17+ and Spring Boot 3.x.
• Hands-on Kafka: producers, consumers, partitions, offsets.
• PostgreSQL design, queries, migrations with Liquibase.
• Experience deploying services on AWS (ECS/Fargate, S3, SQS, IAM).
• Strong TS skills for a published SDK; ESM/CJS understanding.
• Experience publishing npm packages and semantic versioning.
• English at B2+; able to collaborate across countries.

Responsabilidades

• Design, build, and maintain backend services and APIs in Java 21+.
• Develop and maintain the platform’s TypeScript SDK and tooling.
• Own database schema design and migrations for PostgreSQL.
• Deploy and operate microservices on AWS with Terraform pipelines.
• Ensure quality with tests (Vitest) and changelog-driven releases.
• Collaborate across Spain, France, and the UK; mentor engineers.
• Improve observability, logging, metrics, and docs.

Conocimientos

Java 17+

Spring Boot 3.x

Kafka

PostgreSQL

Liquibase

AWS ECS/Fargate

S3 / SQS / IAM

TypeScript SDK

Vite bundling

ESM/CJS

Docker

Gradle

Git / CI/CD

English B2+

Educación

Bachelor’s or higher in CS/STEM

Herramientas

Liquibase

Terraform

Kafka tooling

Descripción del empleo

Nalanda, part of Once For All, seeks a Senior Full Stack Engineer with deep Java/Spring Boot backend and a strong TypeScript SDK frontend. You’ll own backend services, Kafka-driven data flows, and the SDK that exposes document data to clients. Expect cross-country collaboration and modern cloud infra.

You’ll contribute to architecture, tooling, and deployment, while mentoring engineers and shaping platform standards across Spain, France, and the UK.