# Principal Engineer

**Company:** [Unit](https://hotfix.jobs/companies/unit)
**Location:** Tel Aviv, Israel
**Role:** Fullstack Engineering
**Experience:** 10+ years
**Skills:** Distributed Systems, Microservices, AWS, Kubernetes, Scala, Functional Programming, Zio, Cats, Scalaz, Event-Driven Architecture, Event Sourcing, Cqrs, Domain-Driven Design, Temporal, Aws Step Functions
**Posted:** 2026-06-09

> Principal Engineer in the CTO Office leading cross-engineering initiatives across reliability, performance, architecture, cost efficiency, developer experience, and security. The role requires 10+ years designing and operating large-scale distributed microservices and offers broad influence over the platform’s technical direction.

## Job Description

## Responsibilities
- Partner with engineering teams on technical efforts and lead cross-team engineering initiatives.
- Contribute hands-on to critical technical efforts, investigations, and infrastructure initiatives across the organization.
- Lead initiatives that improve the reliability, performance, cost effectiveness, developer experience, security, and operational health of systems.
- Identify long-term technical opportunities and challenges, and drive engineering improvements that raise the overall quality and effectiveness of the platform.
- Design and implement solutions for challenges at the core of the platform.
- Support the continued evolution of engineering practices.

## Requirements
- 10+ years of experience designing, building, deploying, and operating large-scale distributed systems in a microservices environment.
- Previous experience in a Principal Engineer role at a large-scale SaaS company is an advantage.
- Strong understanding of production systems concepts, including reliability, scalability, performance, observability, cost efficiency, and security.
- Strong systems-thinking skills and sound engineering judgment when solving complex technical challenges.
- Excellent collaboration and communication skills, with the ability and desire to work across teams and disciplines.
- Experience with cloud-based infrastructure.
- Passion for building high-quality software.
- Genuine interest in the product and business domains, and in connecting technical decisions to customer and business outcomes.

## Nice-to-haves
- Familiarity with AWS and Kubernetes.
- Experience with Scala and functional programming ecosystems such as ZIO, Cats, or Scalaz.
- Experience with modern software architecture and design patterns, including event-driven architectures, Event Sourcing, CQRS, and Domain-Driven Design (DDD).
- Experience with workflow orchestration or durable execution frameworks such as Temporal, Cadence, or AWS Step Functions.

## Benefits
- Opportunity to join a global team working to create a more equitable financial ecosystem.

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