Testlio
Testlio provides a managed crowdsourced testing platform that combines human testers with AI to accelerate software releases. The company has 918 employees and has raised $19M in funding.
The growth story
Testlio grew from 453 to 918 employees between 2021 and 2026, raising $19M along the way, most recently a Series B in October 2021.
About
Testlio offers a platform that integrates on-demand testers into software release processes, enabling testing across devices, languages, and payment methods. Its proprietary AI engine, LeoAI, orchestrates testing, matches testers, and provides predictive insights to improve release speed and user experience.
The company, founded in 2012, operates fully remotely and has grown to 918 employees. It raised $19M in a Series B round in October 2021, backed by investors including Altos Ventures and Click Ventures.
Founders and leadership
Testlio is led by a distributed team, with engineering being the largest function, comprising 93 employees. The company operates fully remotely, reflecting its distributed-by-design approach.
The Testlio org chart
Summer Weisberg (Chief Executive Officer) leads 60 mapped leaders with 3 direct reports. Click +N to expand a team; names link to the person’s public profile.
Departments, and which ones grew
Headcount by function: Quality Assurance 465 (+2% YoY), Engineering 312 (+3% YoY), Business Development 30 (+11% YoY), Information Technology 29 (+12% YoY), Sales 16 (+23% YoY), Marketing 10 (+25% YoY).
Talent flow
Testlio hires talent from companies like uTest and Applause, with notable alumni moving to Amazon, Apple, and Wise. Employees have a median tenure of 3 years.
Most common previous employers of Testlio staff: uTest (15), Applause (10), Oracle (5), Appen (5), Test IO (4), New Relic (3). Former Testlio employees most often moved to Amazon (4), Xolo (3), Apple (3), Wise (3), Bolt (3), EPAM (3).
Alumni worth knowing
The Testlio mafia
Testlio alumni have founded 13 companies, including Autoptic, Supersimple, and Darkstar, which collectively employ over 50 people.
13Steve Semelsberger, was CEO & Board Chair until 2025Marko Klopets, was Software Engineer until 2018Ragnar Sass, was Advisor until 2016Taavi Rehemägi, was Software Developer until 2017Kerli Rungi, was VP, Learning & Development until 2023
Mihkel Reimand, was Product Manager until 2017
Renita Käsper, was Director of Global Recruiting until 2023
Vadym Kutsenko, was Software Tester until 2017
Lilian Caruana, was Business Operations Project Manager until 2023
John Ruberto, was Sr Engagement Manager until 2021
Ama Birken, was QA Project Manager until 2018
Hanna Papova, was Test Lead until 2020Hiring now
Web traffic
Traffic mix: 49% direct, 32% search, 5% social, 3% paid.
What this company is made of
Most common skills at Testlio: Manual Testing (376), Regression Testing (299), Software Testing (296), Functional Testing (269), Communication (261), Jira (259), Quality Assurance (248), Microsoft Office (247).
Where the team actually sits
Testlio people are concentrated in Estonia (10), Harjumaa, Estonia (8), California, United States (7), Nairobi County, Kenya (7).
Search footprint
Testlio attracts about 8,027 organic search visits a month, traffic worth roughly $141K a month if bought through ads. It gained 1,893 ranking keywords and lost 2,435 in the last period.
What employees say
- Compensation
- 3.50 / 5
- Career opportunities
- 3.40 / 5
- Senior management
- 3.50 / 5
- Work-life balance
- 3.90 / 5
Frequently asked
Testlio has 918 employees as of September 2026.
Testlio has raised $19M in total, most recently a Series B round in October 2021.
Testlio was founded in 2012 by Kristel Kruustuk.
Summer Weisberg (Chief Executive Officer) sits at the top of Testlio's reporting structure, with 3 direct reports.
The most common previous employers of current Testlio staff are uTest (15 people), Applause (10 people), Oracle (5 people).
Former Testlio employees most often move to Amazon (4), Xolo (3), Apple (3).
At least 13 companies have a founder who previously worked at Testlio, including Autoptic, Supersimple, Darkstar.
Testlio attracts about 8,027 organic search visits a month, worth roughly $141K a month in equivalent ad spend.
The most common skills among Testlio staff are Manual Testing, Regression Testing, Software Testing, Functional Testing, Communication.
Testlio staff are concentrated in Estonia (10), Harjumaa, Estonia (8), California, United States (7).
Testlio has about 465 people in Quality Assurance, up 2% over the past year, as of September 2026.
Testlio has about 312 people in Engineering, up 3% over the past year, as of September 2026.
Computed from 256 current and 347 former Testlio profiles, as of September 2026. Source: Crustdata.
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