Sr Software Engineer

Sinch AB; Stockholms kommun; On-site; SEK 591,480 - 747,720; Full time

Job summary

Sinch AB in Stockholm is seeking a Senior Full-Stack Engineer to join our Customer Analytics team. The role is a 50/50 split between backend and frontend development, focusing on Node.js services and modern React-based web applications.

You'll design and build backend services in Node.js, create scalable frontend apps with React and TypeScript, contribute to architecture, and work closely with product and design teams. Fluent English required; Kubernetes and GCP experience are nice-to-haves.

Qualifications

• Proven experience building backend services in Node.js.
• Solid experience with React and TypeScript.
• Experience building REST APIs and working with distributed systems.

Responsibilities

• Design, develop, and maintain backend services in Node.js
• Build modern, scalable frontend applications using React and TypeScript
• Contribute to architectural decisions across backend and frontend
• Improve performance, scalability, and reliability of core systems
• Collaborate closely with product, design, and other engineering teams
• Participate in DevOps practices such as CI/CD, monitoring, and cloud deployments

Skills

Node.js

React

TypeScript

REST APIs

Distributed systems

AWS cloud

Leadership

Tools

Kubernetes

GCP

CI/CD tooling

Job description

Senior Full-Stack Engineer – Customer Analytics, Stockholm

We are looking for a Senior Full-Stack Engineer to join our Customer Analytics team in Stockholm. This role is a 50/50 split between backend and frontend development, with a strong focus on Node.js services and modern React-based web applications. The team is new, offering real ownership and the chance to shape how we build from the ground up.

Responsibilities

• Design, develop, and maintain backend services in Node.js
• Build modern, scalable frontend applications using React and TypeScript
• Contribute to architectural decisions across backend and frontend
• Improve performance, scalability, and reliability of core systems
• Collaborate closely with product, design, and other engineering teams
• Participate in DevOps practices such as CI/CD, monitoring, and cloud deployments

Requirements

• Strong professional experience building backend systems in Node.js
• Solid experience with React and TypeScript
• Experience building REST APIs and working with distributed systems
• Good understanding of frontend architecture and modern web standards
• Experience working in cloud-native environments (AWS)
• Experience making high-impact architectural decisions, ideally in a senior or lead capacity
• Fluent in English

Nice-to-haves

• Experience with Kubernetes
• Experience with GCP
• Experience working at a product-focused company, with an understanding of how engineering drives customer experience

Salary

The monthly salary for this position is between 53,000 SEK and 67,000 SEK. Factors that may affect pay within this range include skills, education, experience, and other qualifications.