Lean UX is a design process that focuses on creating designs that are based on user feedback and iteration. It emphasizes collaboration and rapid iteration, and it aims to deliver a minimum viable product (MVP) as quickly as possible. Here's how to implement the Lean UX process:

Define

Define the problem: Start by defining the problem you want to solve. This involves conducting user research, identifying user needs, and analyzing the competition. Create hypotheses: Based on the problem definition, create hypotheses about what solutions might work. These hypotheses should be testable and measurable.

Research

There are several ways to conduct user research for feature development. Here are some of the best ways:

1. Surveys: Online surveys are a quick and easy way to gather data from a large number of users. They can be used to collect both quantitative and qualitative data, and can be distributed via email, social media, or a website.
2. Interviews: Conducting user interviews can provide deeper insights into users' needs and behaviors. Interviews can be done in person, over the phone, or through video conferencing.
3. User testing: This involves having users test a prototype or a working feature to identify areas for improvement. User testing can be done in person or remotely.
4. Analytics: Analyzing user behavior data can help identify patterns and pain points in the user journey. Tools like Google Analytics and Mixpanel can provide insights into user behavior.
5. Field studies: Conducting field studies involves observing users in their natural environment to gain insights into their behavior and needs. This can be done through ethnographic research or contextual inquiry.
6. Competitor analysis: Analyzing the features and user experience of competitor products can help identify gaps in the market and provide inspiration for new features.

Ultimately, the best way to conduct user research for a feature development will depend on the specific context of the project and the resources available. It is important to choose a research method that aligns with the goals of the project and provides the most valuable insights within the given time and budget constraints. This is the final stage of Lean UX. Here, you check the product with users and validate or invalidate your hypotheses. Analyze the data after testing your designs and hypotheses with users. (Maze is good software for usability testing).

Design

Based on the research insights, ideate, sketch, and create prototypes or wireframes to visualize the layout, structure, and functionality of the product. This stage involves creating user flows, site maps, and other design assets to define the product's overall look and feel.

Test

User and stakeholder testing

Iterate

Based on the feedback and validation, iterate on the design and make improvements. This process should be repeated until the design meets the user's needs and the hypotheses are validated.

Based on the category of feature/task all these may not apply in full. Some will be quick fixes where research and mapping won’t be necessary. Other categories might require all steps and processes depending on the deadline and sprint run.