Principal Software Architect

Testlio is hiring a Principal Software Architect to work as a hands-on individual contributor on its crowdsourced testing platform. The role is fully remote and open to people who live in the United Kingdom, Poland, or the Czech Republic. You would shape the company's application and platform architecture and build production systems behind its distributed software testing tools.

What you will do

• Architect, develop, and deploy scalable production services across the core Testlio platform.
• Write architectural standards and reference patterns that define domain boundaries and split the current codebase into modular services.
• Work with the Director of Engineering on frontend framework consolidation, improving operational performance and observability.
• Design with security, cost efficiency, and ISO 27001 expectations at the center.
• Integrate secure AI and LLM patterns into customer-facing surfaces, with operational guardrails and failure modes for the Quality API.
• Advise executive, product, and engineering teams on major technical tradeoffs and turn business needs into technical strategies.

What they are looking for

• 15+ years of hands-on software development experience building cloud-native, business-critical platforms.
• Advanced knowledge of distributed system patterns, data modeling, event-driven design, and relational and NoSQL databases.
• A track record of designing and migrating application infrastructure from monolithic architectures to modular services.
• Deep experience with enterprise patterns in AWS, including high availability, cost optimization, and secure infrastructure.
• Familiarity with modern full-stack environments: front-end web frameworks, scripting languages, and CI/CD pipelines.
• Production experience deploying AI, ML, or LLM-based solutions with observable, safe automation patterns.
• Fluency in English, with strong written and verbal communication for presenting architecture concepts to business leaders.
• Ability to work as an individual contributor in fast-paced, ambiguous environments and take ownership of problems.
• Collaboration skills to guide distributed engineering teams and technical peers without direct authority.
• Analytical thinking that balances long-term technology vision with short-term implementation constraints.
• A natural fit for remote-first work, documenting technical decisions asynchronously across time zones.

Why Testlio

Testlio is a female-founded company, and half of its team identifies as women. The company says its culture is inclusive and purpose-driven, and team members call themselves TestLions. Work is fully remote and asynchronous, with tools and guidance provided for a distributed team. The company describes its working style as one where people make decisions, communicate clearly, and work at a sustainable pace.

Benefits include flexible paid time off, covering national holidays, personal days, and sick days, plus stock options and a $300 annual learning stipend. Testlio says it is growing, profitable, and cash-strong, with a subscription-based enterprise business model. Several of its largest clients have been with the company for 7+ years, and many spend $500K+ per year.

Pay and location

The salary is USD 500,000 per year. The role is 100% remote, but you must reside in the United Kingdom, Poland, or the Czech Republic.

Application process

Because Testlio is fully distributed, the interview process includes conversations with several team members so you can understand the role, the people, and how the team collaborates. It typically takes 3–4 weeks to complete.

• Application
• Recruiter interview
• TestGorilla assessment
• Team and stakeholder interviews
• Reference checks
• Offer and background check

Testlio is an equal-opportunity employer committed to an inclusive environment for people of all backgrounds and identities. The company is female-founded, and 46% of team members identify as women.