Sinch is a Customer Communication Cloud company powering conversations across messaging voice and email helping businesses deliver personalized customer experiences at scale More than 150000 businesses including leading general tech companies rely on Sinch Las cualificaciones, habilidades y toda la experiencia relevante necesaria para este puesto se pueden encontrar en la descripción completa a continuación.

The Role

We are building the next generation of conversational AI infrastructure As a Senior Java Software Engineer on the Agentic Orchestration Platform team you will design build and own core components that coordinate AI agents workflow execution and multichannel communication via SMS WhatsApp and voice at scale

This is a zero to one opportunity to build a new platform from the ground up You will work on complex problems with high autonomy as part of a small senior team with significant impact You will collaborate with Engineering Manager Tech Lead Product Manager Domain Architect and cross functional teams

What You Will Do

Design and build core platform components with high ownership and autonomy

Drive system design and create technical proposals

Work on distributed event driven systems combining deterministic workflows and AI agent behavior

Write production grade software including clean maintainable code with tests and documentation Build systems that are observable debuggable and resilient

Own full lifecycle including design deployment monitoring and on call responsibilities

Follow build ship run approach





Develop platform components integrating LLMs and AI agents

Work with prompt management context handling function calling guardrails and error recovery

Address challenges like testing non deterministic systems fallback strategies latency and cost optimization

Contribute to engineering excellence through architecture discussions code reviews and standards definition

Mentor team members and share knowledge

Collaborate across teams with product and technical stakeholders

Provide technical guidance and trade offs and align solutions with business needs

What We Are Looking For

Five to eight plus years of professional software engineering experience

Strong backend and platform skills including distributed systems microservices event driven architectures and cloud native design.

Ability to explain architectural trade offs clearly.

Strong engineering fundamentals including clean code testing strategies debugging production systems and building reliable long lasting systems

Experience with Java Spring AI TypeScript or React Deep expertise in at least two core backend technologies and willingness to learn others quickly

Experience using AI coding tools such as Copilot Claude Code Cursor or similar





Understanding benefits risks and best practices

Ability to work autonomously define scope and deliver solutions independently Strong decision making on prioritization

Experience with cloud and operations including AWS Docker Kubernetes CI CD GitOps infrastructure as code and monitoring

Strong communication skills with both technical and non technical stakeholders Fluent English required

Nice to have

Experience with Temporal and Kafka

Experience with conversational AI LLMs or agent based systems

Experience building platforms from scratch

Background in CPaaS or communication platforms The annual salary for this position is between €60.000 until €80.000 Factors which may affect pay within this range may include skills, education, experience, and other qualifications

OUR HIRING PROCESS

We are committed to ensuring a recruitment process that is fair, objective, consistent, and inclusive. Our approach includes structured, competency-based interviews designed to evaluate your skills, experience, and qualifications relevant to the role. At times, we may include a data-driven assessment to enhance our hiring success and identify candidates likely to excel. xiphteb

We believe in a two-way process and encourage you to ask questions throughout the journey. If this role isn't what you're looking for, please explore the other opportunities listed on our career page: No matter who you are, we hope you find an exciting path forward - hopefully with us!

📌 Sr Software Engineer (Madrid)
🏢 Sinch
📍 Madrid