Founding Organisationl Psychologist / People ScientistTessembl | Founding I/O Psychologist / People Scientist

Location: [Mumbai / Hybrid]

Type: Full-time

Compensation: Competitive + meaningful ESOP

Apply: [email protected]

About TessemblTessembl is an early stage workforce intelligence company building data driven tools to help organisations make better people and workforce decisions.

We are combining behavioural science, organisational psychology, workforce data and statistical modelling to create a new generation of decision-support software for organisations with large and distributed workforces.

We are building our founding team and are looking for an I/O Psychologist / People Scientist to own the behavioural-science and assessment foundation of the company.

The roleYou will work directly with the founders, Quant Lead and engineering team to define how Tessembl measures and interprets job relevant human characteristics.

This is not a conventional HR, counselling or employee-engagement role.

You will help determine

- what psychological and behavioural constructs should be measured;
- how assessments should be designed;
- how role relevant behaviours should be interpreted;
- how workplace perceptions can be measured responsibly;
- how behavioural data should be validated against real organisational outcomes.

As an early founding hire, you will have significant influence over Tessembl's scientific methodology and future people-science function. What you will do
- Lead the design of Tessembl's behavioural and psychometric assessment framework.
- Define job relevant psychological and behavioural constructs.
- Develop assessment items, scales, scoring approaches and interpretation frameworks.
- Design role-specific behavioural measurement structures.




- Develop approaches for cognitive, personality, behavioural and situational assessment.
- Work with the Quant Lead on reliability, validity and predictive analysis.
- Design and analyse self report and multi rater workplace assessments.
- Develop manager and peer-rating frameworks based on observable workplace behaviours.
- Build safeguards against social desirability, impression management and response distortion.
- Contribute to calibration, fairness and adverse impact testing.
- Define interpretation limits and appropriate use of assessment outputs.
- Support pilot study design and research methodology.
- Translate psychological constructs into clear product requirements for the engineering team.
- Help establish Tessembl's standards for ethical and responsible use of workforce data.
- Review product claims and ensure that behavioural insights remain scientifically defensible.
- Support customer implementations where psychological interpretation is required.

What we are looking for
- Postgraduate qualification in Industrial/Organisational Psychology, Organisational Psychology, Psychometrics, Behavioural Science or a closely related discipline.
- Strong understanding of psychometric theory.
- Experience designing, validating or interpreting workplace assessments.
- Understanding of reliability, validity, construct measurement and criterion-related validation.




- Knowledge of personality, cognitive and behavioural assessment.
- Ability to work with quantitative researchers and understand statistical evidence.
- Strong written and verbal communication skills.
- Ability to translate psychological theory into practical workplace measurement.
- Comfort working in an early stage company where methodologies will be tested, challenged and refined.

Particularly valuable experienceExperience with one or more of the following would be highly practical:
- Big Five personality models;
- occupational assessment;
- situational judgement tests;
- assessment centres;
- competency frameworks;
- psychometric item development;
- factor analysis;
- measurement invariance;
- criterion validity;
- 360 degree or multi-rater assessment;
- organisational research;
- workforce analytics;
- bias, fairness and adverse-impact testing.

What this role is notThis is not primarily a:
- recruitment role;
- HRBP role;
- counselling role;
- employee-relations role;
- learning-and-development delivery role.

We are looking for someone who can help build the scientific measurement and behavioural-intelligence foundation of a workforce technology company. Why joinYou will join Tessembl at the stage where the underlying behavioural-science architecture is still being built.

You will have meaningful influence over:

- assessment methodology;
- construct selection;
- validation standards;
- ethical safeguards;
- research design;
- product development;
- future people-science hiring.

This role is suited to someone who wants to build a behavioural-science function from the ground up and contribute directly to a new workforce-intelligence product

📌 Organizational Psychologist (Mumbai)
🏢 Tessembl
📍 Mumbai