Software Engineer - Developer Experience / Agent Experience (Node.js)
Role details
Job location
Tech stack
Job description
As a Software Engineer in our Developer Experience (DX) organization, you will play a key role in building and evolving our MCP server , which is a central piece of how Sinch APIs are discovered, understood, and consumed by external developers and agentic platforms.
This is not a traditional backend product role. You will be working on developer-facing infrastructure that connects APIs, SDKs, and documentation into a cohesive and consistent experience, with a strong focus on standards, interoperability, and agentic consumption.
Your work will be used directly by external developers, AI agents, and third-party frameworks . You care about what makes APIs and platforms pleasant to integrate with, and you enjoy thinking about developer ergonomics, consistency, and correctness., * Be a core contributor to our MCP server , participating in its design, implementation, and long-term evolution, with increasing ownership over time.
- Design and implement Node.js / TypeScript services that expose Sinch APIs in a way that is discoverable, standards-compliant, and easy to consume by developers and agentic frameworks.
- Collaborate closely with Product Management, SDK engineers, and documentation teams to ensure a cohesive developer and agent experience across APIs, SDKs, and MCP.
- Contribute in the definition and implement API standards, schemas, and validation mechanisms that ensure consistency and high quality across integrations.
- Build and maintain authentication, authorization, and configuration suitable for external developer and agentic usage.
- Ensure good levels of reliability, observability, and test coverage for a platform that external developers depend on.
- Actively gather feedback from internal teams and external usage to continuously improve the MCP server and developer workflows.
- Take part in architectural discussions around agentic protocols, emerging standards, and ecosystem integrations , learning and growing in this space with the team., * You have opinions about what makes a good API and a good developer experience , but you're open to discussion and feedback.
- You think in terms of systems and ecosystems , not just individual services.
- You care about long-term maintainability and standards , not quick fixes.
- You're comfortable operating at the intersection of platform engineering , product thinking , and developer experience .You enjoy working closely with product counterparts and influencing direction through technical contributions.
What we don't expect
We don't expect you to:
- Be an expert in all agentic frameworks, protocols, or standards from day one.
- Have prior experience with MCP specifically: the ability to learn and reason about new standards matters more than prior exposure.
- Work in isolation or own everything alone: this role is highly collaborative and supported by peers across Product, SDK, and Platform teams.
- Be a pure feature-delivery backend developer: success here is measured by usability, consistency, and adoption, not just output.Have perfect answers upfront: we value curiosity, good judgment, and the ability to iterate and improve designs over time.
Why this role matters
The MCP server is a strategic pillar for Sinch's API and agentic platform ambitions. Success in this role directly impacts:
- How easily developers and agents discover and adopt Sinch APIs
- How consistent and trustworthy our API ecosystem feels
- How well Sinch positions itself as a developer-first, agent-ready platform
You will be building infrastructure that defines how the outside world experiences Sinch .
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.
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: https://www.sinch.com/careers/ . No matter who you are, we hope you find an exciting path forward - hopefully with us!
Requirements
Do you have experience in Usability?, * 5+ years of professional software development experience, with strong focus on Node.js and TypeScript .
- Solid experience designing and building backend services and APIs .
- Good understanding of REST APIs , API contracts, and schema-driven development.
- Experience working on developer-facing platforms , tooling, or infrastructure, or strong interest in this type of work.
- Familiarity with API authentication patterns , and configuration management.
- Experience with testing strategies , CI/CD pipelines, and production-grade systems.
- Comfort working in a role where developer experience and usability are key success metrics.Fluent English, both written and spoken.
Nice to have
- Experience with MCP , OpenAPI, or similar API description and discovery standards.
- Exposure to agentic frameworks (e.g. LangChain, ADK) or AI-enabled developer tools.
- Experience developing or maintaining SDKs, libraries, or developer tooling
- Knowledge of schema validation or contract-first approaches (e.g. Zod ).
- Experience working across multiple languages or SDK ecosystems (e.g. .NET, Java, Python).
- Strong written communication skills, especially in technical documentation or design proposals.Excellent problem-solving skills and attention to detail.
