Principal Software Engineer

Sinch AB; España; On-site; PHP 6,258,692 - 7,649,513; Full time

Job summary

Sinch AB is seeking a Principal Engineer / Domain Architect to evolve teams into a cohesive platform for customer communications. This hands-on role involves working closely with engineers and contributing to production code.

Responsibilities include providing architectural direction, coaching teams, and ensuring operational excellence. The ideal candidate has extensive software engineering experience with strong Java and TypeScript skills, a deep understanding of distributed systems, and a proven influence on technical decisions.

Qualifications

• 10+ years of software engineering, including principal or tech lead roles.
• Hands-on coding skills in Java and TypeScript.
• Deep understanding of distributed systems and event-driven architecture.
• Experience with cloud-native technologies and modern infrastructure practices.
• Proven ability to guide teams without authority and strong written communication skills.
• Fluent English.

Responsibilities

• Provide practical patterns and decision frameworks for teams.
• Contribute directly to production code in Java and TypeScript.
• Define and maintain clear architecture direction for the Engage domain.
• Drive operational excellence and define frontend architecture standards.
• Coach engineers and teams on architectural thinking.
• Align technical decisions across teams and represent Engage in discussions.

Skills

Java

TypeScript

Distributed Systems

Cloud-Native Technologies

Infrastructure Practices

Communication Skills

Tools

Terraform

AWS

Kubernetes

Job description

Company Overview

Sinch is pioneering the way the world communicates. More than 200,000 businesses — including Google, Uber, PayPal, Visa, Tinder, and many others — rely on Sinch’s Customer Communications Cloud to power engaging customer experiences through mobile messaging, voice, and email.

Whether you need to verify users or craft omnichannel campaigns, Sinch makes it easy. Our AI‑infused network, APIs, and applications ensure reliable and secure customer communication at every step of the journey.

At Sinch we Dream Big, Win Together, keep it Simple, and Make it Happen — these values are our foundation.

DESCRIPTION

As a Principal Engineer / Domain Architect in the Engage domain, you will help evolve multiple successful teams into a cohesive, scalable platform that powers customer conversations. This is a hands‑on individual contributor role where your impact comes from working closely with engineers, contributing to code, and enabling better technical decisions across teams.

You will operate across Inbox, Contacts, Mobile, and Conversation Starters, shaping architecture, reducing friction, and raising engineering maturity, not through top‑down ownership, but through influence, clarity, and practical solutions.

Key Responsibilities

• Enable teams by providing practical patterns, guardrails, and decision frameworks that are adopted because they are effective
• Contribute directly to production code (Java and TypeScript) and prototype solutions to validate architectural decisions
• Define and maintain a clear architecture direction (current state, target state, and evolution path) for the Engage domain
• Drive operational excellence, including observability standards, reliability practices, and infrastructure discipline (e.g. Terraform‑first approach)
• Define frontend architecture standards, including micro‑frontend boundaries, contracts, and independent deployment models
• Coach engineers and teams to build architectural thinking and decision‑making capability
• Reduce cross‑team and cross‑domain friction, aligning technical decisions and representing Engage in broader architecture discussions

Requirements

• Extensive experience in software engineering (10+ years), including time in principal, staff, or tech lead roles across multiple teams
• Strong hands‑on coding skills in Java and TypeScript, with a track record of staying close to production systems
• Deep understanding of distributed systems, including event‑driven architecture, APIs, and service design
• Experience working with cloud‑native technologies (AWS, Kubernetes) and modern infrastructure practices (including Terraform and CI/CD)
• Proven ability to influence without authority, guiding teams through trust, clarity, and practical solutions
• Strong written communication skills, including experience with architecture documentation and decision records
• Fluent English

Nice to Have

• Experience owning or evolving a micro‑frontend architecture at scale
• Kafka or event streaming in a multi‑team production context
• Automation and fitness‑function mindset: governance shifted left through automated guardrails, not manual review
• Background in conversational AI, CPaaS, or customer engagement platforms

What Success Looks Like

• Teams seek your input before making significant technical decisions, not after.
• Cross‑domain friction, duplicated services, inconsistent tech choices, unclear boundaries, surfaced and resolved.
• Every team in Engage has a documented, living target architecture that is actually used to prioritize.
• Architecturally significant decisions are documented and discoverable; teams reference them instead of re‑asking.
• Engineers around you start thinking architecturally on their own.
• The clearest signal of success is that your influence becomes embedded in how teams work, almost invisible, rather than dependent on you being in every room.

Salary

The annual salary for this position in Spain is between €90,000 – €110,000. Factors which may affect pay within this range may include skills, education, experience, and other qualifications.