Contract

Human Factors Engineer

Posted on 5/11/2026

Flo Health

Flo Health

501-1,000 employees

Digital women’s health tracking and insights

No salary listed

London, UK

Hybrid

Three days on-site per week in London.

Category
Biology & Biotech (1)
Required Skills
FDA Regulations
Risk Management
Data Analysis
Requirements
  • Degree or higher in Human Factors Engineering, or relevant related subject
  • Fluency and confidence understanding IEC 62366-1, ISO 14971, and FDA regulations
  • Significant experience conducting human factors research with software based medical devices that is compliant with IEC 62366-1, ISO 14971, and FDA regulations
  • Experience in creating and maintaining usability documentation to ensure compliance with IEC 62366-1, ISO 14971, and FDA regulations
  • Applied understanding of the product development process
  • Applied understanding of medical device industry
  • Relevant industrial experience commensurate with requirements of an experienced and independent contractor
  • Exceptional attention to detail and precise data handling and analytical skills
  • Technical report writing skills
  • Exceptional time management skills and an ability to work well under pressure
Responsibilities
  • Establishing Usability Engineering at Flo Health
  • Assessing current development, design control, quality, and risk management processes to identify where usability engineering activities and artefacts should be embedded
  • Defining a lean end-to-end usability engineering process, including activities, inputs/outputs, decision points, roles, responsibilities, and interfaces to risk management and design controls
  • Defining the required usability engineering documentation and templates that comply with IEC 62366‐1, ISO 14971, and FDA regulations
  • Conducting/Leading Formative and Summative Evaluations
  • Maintaining and updating the Usability Engineering File
  • Conducting the necessary formative evaluations to identify and mitigate use-related issues prior to summative testing
  • Refining the critical task analysis, use-related risk analysis, and hazard-related use scenarios to ensure appropriate summative coverage
  • Defining the summative evaluation scope, including device/product configuration(s), user groups, use environments, and critical tasks
  • Creating the Summative Evaluation Protocol including acceptance criteria, sample size rationale, recruitment criteria, test scenarios, and success metrics
  • Preparing all required summative testing materials, including moderator guide, participant materials, observation forms, and any other study documentation needed for execution
  • Conducting the summative evaluation and documenting the results in a Summative Evaluation Report
  • Assessing residual use-related risks and documenting conclusions and traceability within the usability engineering file
  • Upskilling the UXR Team
  • Coaching on how to conduct and document formative and summative evaluations and use-related risk activities
  • Supporting the team in building reusable templates, checklists, and playbooks
Desired Qualifications
  • Experience with software as a medical device in the women’s health space
  • Experience conducting training on IEC 62366-1 and FDA Human Factors guidance, and practical implementation in a medical device environment

Flo Health develops a mobile app that helps women manage their health by tracking menstrual cycles, ovulation, pregnancy, and menopause. The app uses user-entered data and signals from the body to provide personalized health insights, curated content, and a private community where users can ask questions. It features a large team of medical experts and tools like Flo Anonymous Mode to protect privacy. Users access cycle and fertility tracking, educational content, and health resources through the app, with some features and access donated to users in need through pro-social programs. Flo also partners with research and health organizations to advance women’s health and reduce knowledge gaps. The goal is to democratize access to accurate, personalized health information for women worldwide and empower proactive health management while improving health literacy and reducing stigma.

Company Size

501-1,000

Company Stage

Series C

Total Funding

$276.4M

Headquarters

London, United Kingdom

Founded

2015

Simplify Jobs

Simplify's Take

What believers are saying

  • Series C $200M funding June 2024 enables expansion into perimenopause, targeting 1 billion women globally.
  • Mandy Ginsberg joining board January 2025 brings Match Group scaling expertise for consumer tech growth.
  • npj Women's Health research February 2025 establishes Flo as thought leader in perimenopause science.

What critics are saying

  • Apple Health native menstrual tracking with encryption migrates 40% iOS users, reducing MAU by 28 million.
  • EU AI Act enforcement fines Flo 6% gross bookings for opaque neural network predictions by June 2026.
  • Clue app's superior AI accuracy captures precision-seeking users, eroding Flo's retention within 18 months.

What makes Flo Health unique

  • 70 million monthly active users with 60% retention over one year demonstrates strong product-market fit.
  • Anonymous Mode feature open-sourced June 2023 establishes industry-leading privacy standard competitors cannot match.
  • Perimenopause tools launched May 2026 address 66% of women feeling unprepared, expanding addressable market.

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Your Connections

People at Flo Health who can refer or advise you

Benefits

Health Insurance

Paid Vacation

Paid Sick Leave

Paid Holidays

Parental Leave

Flexible Work Hours

Hybrid Work Options

Unlimited Paid Time Off

401(k) Company Match

401(k) Retirement Plan

Sabbatical Leave

Performance Bonus

Wellness Program

Growth & Insights and Company News

Headcount

6 month growth

0%

1 year growth

-1%

2 year growth

0%
Tech Times
Jan 21st, 2026
Flo Health Recognized by Google Play for Wearable Innovation Across Asia

Flo Health recognized by Google Play for wearable innovation across asia. Flo Health, the company behind the globally trusted Flo App, has been named a Google Play Best of 2025 Award winner in the Best for Watches category across Hong Kong, Taiwan, and Macau, reinforcing its position as a leader in women's digital health innovation. The recognition highlights Flo Health's continued investment in wearable technology and its commitment to delivering high-quality, science-backed health experiences beyond smartphones. As part of Google Play's annual "Best of" program, the award honors apps that demonstrate outstanding product experience, technical excellence, and consistent value for users. According to Google Play's Best of 2025 team, this year's winners were selected for their ability to "push boundaries and expectations" while maintaining regular, high-quality updates and meaningful engagement with users. The Flo App's wearable experience stood out for its usability, reliability, and thoughtful design, particularly in markets where smartwatch adoption continues to grow rapidly. Available on compatible Google Wear OS devices, the Flo App for watches provides users with at-a-glance cycle insights, reminders, symptom logging, and health updates designed to fit seamlessly into everyday routines. By extending core functionality to wearables, Flo Health enables users to stay informed and connected to their health without reaching for their phones. Roman Bugaev, Chief Technology Officer at Flo Health, emphasized the importance of meeting users across devices. "Our mission has always been to help women and people who menstruate better understand their bodies through evidence-based insights," Bugaev said. "Being recognized by Google Play across multiple regions validates our approach to building an intuitive, accessible tool, whether on phones, watches, or emerging platforms." The award also reflects Flo Health's broader leadership in femtech. With tens of millions of monthly active users worldwide, the Flo App supports individuals through every stage of reproductive health, from cycle tracking and fertility awareness to pregnancy and menopause. Its wearable features complement the app's mobile experience, offering timely nudges and insights that align with users' daily lives. Beyond product innovation, Flo Health is widely recognized for its emphasis on privacy, security, and medical credibility. Supported by a global network of medical experts, the Flo App delivers personalized health insights grounded in clinical guidance, while features like Anonymous Mode underscore the company's commitment to user trust. The Google Play Best of 2025 Award adds to a growing list of global recognitions for Flo Health and signals the increasing importance of wearable health technology. As smart devices become more embedded in daily life, the Flo App's success across Hong Kong, Taiwan, and Macau demonstrates how thoughtful design and evidence-based innovation can scale across regions and platforms.

Startup Rise EU
Aug 26th, 2025
Flo Health Raises $200M, Hits Unicorn Status

Flo Health, the top women's health app, raised over $200M in Series C funding from General Atlantic, boosting its valuation past $1 billion and achieving unicorn status. The investment will aid Flo's growth into new segments like perimenopause and menopause, enhance tech-driven insights, and expand R&D. Flo aims to reach 1 billion women globally, with nearly 70 million monthly active users and 5 million paid subscribers as of June 2024. Gross bookings for 2024 are expected to exceed $200M.

PR Newswire
Jul 31st, 2025
Flo Reaches Settlement in Class Action Lawsuit After Judge Said He Would Toss Plantiffs' Claim

Flo Health's Anonymous Mode feature was recognized as one of TIME's Best Inventions 2023 and also named a finalist for Fast Company's 2023 World Changing Ideas Awards in the Rapid Response category as part of the company's commitment to privacy.

FinSMEs
Jul 21st, 2025
Flo App Introduces Cutting-Edge Perimenopause Support: A Technological Breakthrough in Women's Health

In a landmark moment for digital health innovation, Flo Health, the world's number one women's health app, has unveiled a groundbreaking technological solution designed to transform the way women experience perimenopause.

2Trom News Group
Jul 17th, 2025
Flo for Perimenopause is Launching to Empower the 1 Billion+ Women Who Experience Perimenopause Without the Support They Deserve

Flo Health, the #1 women's health app worldwide [1] chosen by over 420 million people, today announces the launch of "Flo for Perimenopause," a new in-app offering of personalized guidance and support for women who are in, entering, or curious about perimenopause.