Principal Software Engineer

Testlio Inc.; United Kingdom; Remote; USD 120,000 - 160,000; Full time

Job summary

A leading quality management company, Testlio, seeks a Principal Software Engineer to innovate AI-driven solutions for quality software testing. This fully remote role demands extensive full-stack experience, a solid tech background, and a commitment to excellence, shaping the future of digital product quality.

Benefits

Flexible time off including local holidays

Learning reimbursement up to $300/year

Stock options that start vesting after one year

Qualifications

• 10-15 years of full-stack coding experience, building cloud-native applications.
• Strong affinity with React, TypeScript, NodeJS.
• Fluency in English with excellent communication skills.

Responsibilities

• Lead architectural roadmaps and technical investigations.
• Build scalable and quality products in an iterative approach.
• Define quality standards and mentor team members.

Skills

Full-stack coding experience

API architecture

Cloud-native applications

Event-driven design

Education

University degree in Computer Science or Software Engineering

Tools

React

TypeScript

NodeJS

AWS

Kafka

Job description

Location: This is a fully remote position within a globally distributed company. It is open to candidates located in the EMEA or APAC region who wish to work remotely. Preferred locations include Central and Eastern Europe, Asia, the Middle East, and Africa. Due to our compensation strategy, we will not consider applicants from high-cost-of-living areas such as Benelux, DACH, France, Spain, the Nordics, and the UK.

About the job

Testlio is a leading quality management company. Its unique, AI-powered approach combines humans and machines to help digital innovators assure quality products at scale. On 600K+ real devices. In 100+ languages. With 800+ payment methods. The company is 100% remote, with people in 150+ countries. It is female-founded; approximately 46% of full-time people are women. Clients include Amazon, athenahealth, Match Group, Microsoft, the NBA, Netflix, PayPal, Uber, Wayfair, and many more. Collectively, they have awarded us an industry-leading 4.7 G2 rating. To learn more, visit www.testlio.com .

We are hiring a Principal Software Engineer to help us deliver solutions that harness data & the latest AI advancements to generate measurable business impacts, ensuring our leadership in quality software testing services.

To accomplish this, we seek a distinguished engineer who can showcase their significant experience in enterprise architecture & full-stack solution engineering. If you can confidently tick one or more of these boxes, we’d love to hear from you:

• I hold a Solutions Architect certification (such as AWS Certified Solutions Architect Professional – CSAP)
• I have a public track record of my contributions and coding expertise, featuring significant contributions to prominent open-source projects.
• I’ve held an Architect role at a leading tech company (FAANG-level), demonstrating my ability to operate at the highest industry levels.
• I have played a pivotal technical role in a startup, leading it from inception to a successful product launch, essentially acting as the lead technical powerhouse of the team.

Why you will love this job

• Shape the future of testing with AI: Be at the forefront of innovation, building solutions that harness the power of AI to automate tasks, generate valuable insights, and drive testing efficiency.
• Make a tangible impact: Your work directly influences the success of our clients and the quality of their digital products. See your contributions translated into real-world improvements that benefit millions of users.

Why you will love being a part of Testlio

• A true sense of belonging: The TestLion Pride is a global community of like-minded people who live Testlio’s six values every day.
• Growth through learning: knowledge exchange and learning are central to working at Testlio. You’ll find that motivated, experienced TestLions with diverse backgrounds can always introduce you to new perspectives.
• Enable human possibilities: your work at Testlio has a larger purpose. As a TestLion you will not only help our customers create well-built digital experiences for their users, but also create opportunities for Testlio’s freelance network, and support social impact programs like Ignite .
• Freedom to roam: Testlio is a global company that embraces flexibility while setting standards to help you succeed in a remote environment by having clear expectations for working hours and communication. We look for opportunities to create engagement with TestLions around the world and we want to make sure you can take time off from work to rest. We honor national holidays in your home nation and provide a generous number of days off, including personal wellness days.
• Winning business: Testlio is growing, profitable, and cash-strong. We are leading our industry with exceptional clients who provide us with a high NPS score and a 4.7 rating on G2. Our business model is global, enterprise, and subscription-based, with 85%+ of our revenue recurring. Several of our largest clients have been with us for 7+ years and many spend $500K+/year with Testlio.
• Great culture:Testlio’s is female-founded, and 46% of the population is women. Our purpose, vision, and values help drive positive mindsets and behaviors—people like working with each other and love the company’s global scale. We move fast and empower people on the frontlines to make decisions and own initiatives. We do all this in our 100% fully remote and distributed team.
• Investment in you:As a fully remote, global company, we offer benefits that support your well-being and growth—wherever you are. Enjoy flexible time off (including local holidays, sick leave, and personal days), up to $300/year in learning reimbursement (for courses on Udemy, LinkedIn Learning, and more), and stock options that start vesting after one year.

What would your day look like?

• Lead architectural roadmaps, technical investigations, prototyping, and drive technical decisions needed for impact. Provide quality control for Architectural Decision documents.
• Build and implement performant, scalable, and quality products in an iterative approach.
• Advance AI-augmented software engineering practices by incorporating productivity-boosting GenAI automation across the software development lifecycle.
• Define & advocate quality standards for code, coaching your fellow engineers & constantly raising the bar for quality.
• Work closely with designers and business stakeholders to bring the best solutions to end users.
• Lead debugging and root cause analysis of complex problems, and offer solutions.
• Work in a team environment: contribute to tasks and goals; follow team processes (Scrum) and rituals.
• Help and mentor other team members, proactively share and document knowledge.

What do you need to succeed?

Technical Skills

• A university degree in Computer Science, Software Engineering, or equivalent.
• 10 – 15 years of full-stack coding experience, building modern cloud-native applications.
• Strong affinity with our tech stack of React, TypeScript, NodeJS, GraphQL, PHP, MySQL, AWS, and Kafka.
• Practical knowledge of modern API architecture, microservices, and event-driven design.
• Experience in writing automated tests is a strong plus.
• Proven track record of taking ownership, conducting technical design, and successfully delivering results.
• AI/ML experience is a strong plus.
• Mobile Development: Experience in developing and optimizing mobile applications (whether using fully native frameworks for iOS/Android or cross-platform solutions such as React Native) is a plus.

Human Skills

• Fluency in English, with excellent written and verbal communication skills.
• Organized and thorough with a commitment to quality.
• Results-oriented, with data-driven decision-making and a focus on delivering impactful outcomes.
• Strong preference for a remote working environment.
• A passion for staying current with the latest industry trends and technologies, and a drive to continuously improve and innovate.

What is the Candidate Consideration Process

We do our best to bring on individuals who will be excited about their role and have the potential for a great future with Testlio. Since we are 100% distributed, we’d like you to meet with multiple people from our organization to give you an idea of who you would be working with, your role expectations, etc. Our interview process can take about 4 to 6 weeks to complete.

• Application
• Technical Exercise
• Technical Demo with Hiring Manager
• ~ 4 Team and Stakeholder Interviews
• Reference checks
• Offer and background checks

Diversity and Inclusion

Testlio is an equal-opportunity employer deeply committed to creating an inclusive environment for people of all backgrounds and identities. We are female-founded, and 46% of our team identifies as women. See the DEI section of our website for more information.