Senior Software Engineer

Exclusive opportunity

Onsite

Senior Software Engineer

Sinch

Senior Software Engineer

Skills

Google Cloud PlatformMongoDBDockerNodeTypescriptGolangMicroservicesKafkaRedisAIAWSKubernetesNLP / Natural Language Processing

2 months ago

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Important information

Contract type:

Permanent

Salary:

€60,000 – €80,000 / year

Location:

Madrid, Spain

Work mode:

Onsite

Published on:

29 August 2026

What they need

We are looking for a Senior Software Engineer to help design, build, and scale Chatlayer’s conversational AI platform
You will work across a real-time, distributed system that handles text and voice interactions at scale — including WebSocket infrastructure, bot engine integrations, and platform services
This role requires someone who is comfortable operating in ambiguity, can drive technical decisions, and thrives in a team that ships with urgency while investing in system health
Candidates should bring a knowledgeable and skilled approach to the use of AI in the software development process itself — we value a balanced, curious, and quality-driven use of AI tooling
We’re not looking for engineers who blindly generate code or who refuse to adopt new tools; we want people who apply AI judiciously, maintaining deep comprehension of what they build while leveraging these tools to move faster and think bigger
Design and build backend services supporting Chatlayer’s text and voice channels, including WebSocket servers and real-time communication infrastructure
Work on platform integrations and app-integration frameworks
Contribute to architectural evolution — decoupling legacy dependencies and building more modular, vendor-agnostic systems
Participate in technical decisions around identity management (SinchID), distributed events and data processing (MongoDB Atlas, Kafka, Temporal), and new platform capabilities
Lead code reviews, technical discussions, and knowledge-sharing sessions within the team
Mentor and be mentored by other engineers and contribute to a strong engineering culture rooted in the team’s values
Support production systems through on-call rotations and incident response
Invest in system health — improving test coverage, addressing technical debt, and continuously improving operational processes (Kaizen)- Working knowledge of MongoDB or similar document databases
Strong system design fundamentals — can reason about scalability, latency, failover, and trade-offs
Strong proficiency in Node.js/TypeScript and/or Go
5+ years of professional software engineering experience
Excellent communication skills and comfort working in a distributed, cross-functional team (CET timezone alignment preferred)
Experience building and maintaining RESTful APIs and event-driven architectures (ideally Kafka specifically)
Experience with real-time systems — WebSocket, event-driven architectures, or similar
Experience with microservices architecture and distributed systems, including state management across replicas (e.g. ETCD, Redis)
Solid understanding and hands-on experience with complex cloud infrastructure, ideally GCP and/or AWS
Prior experience in a CPaaS, scale-up, or fast-growth product company
Familiarity with identity management systems (OAuth/OIDC)
Experience with containerisation and orchestration (Docker, Kubernetes)
Experience with conversational AI, chatbot or voicebot platforms, or NLP/NLU pipelines

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