SigTuple Technologies QA Chemist Interview: Rounds, Questions and Preparation

What the job involves

A QA Chemist in healthcare and pharma ensures that raw materials, in-process samples, and finished products meet specified quality standards through chemical and physical testing. Day to day, they perform analytical tests using instruments like HPLC, UV-Vis, and titrators, document results in compliance with GMP and GLP, and investigate out-of-specification results. In fast-growing medtech or diagnostics companies, they may also support validation of new test methods and maintain lab records for audits.

Role and Technical Knowledge

1. 1

   What is the difference between quality control (QC) and quality assurance (QA) in a pharma or diagnostics lab?

   Explain that QC focuses on testing and inspecting products to meet specifications, while QA focuses on process and system audits to prevent defects. Mention that QA oversees QC and ensures compliance with GMP.

2. 2

   Explain the principle of HPLC and list the key components of an HPLC system.

   Cover separation based on partitioning between mobile and stationary phases, and name components like pump, injector, column, detector, and data system. Mention common detectors like UV-Vis or PDA.

3. 3

   What are the key steps in performing a titration, and how do you ensure accuracy?

   Describe preparation of standard solution, use of burette, indicator selection, and endpoint detection. Emphasise calibration of burette, rinsing, and repeating titrations for concordant values.

4. 4

   What is an out-of-specification (OOS) result, and what is the typical procedure to handle it?

   Define OOS as a result outside established specifications. Outline immediate reporting, Phase I lab investigation, Phase II manufacturing investigation, and documentation as per SOP and GMP.

Practical Scenarios and Troubleshooting

1. 5

   You are testing a raw material sample and the assay result is 95.0 percent against a specification of 98.0 to 102.0 percent. What steps do you take?

   State that you would first check for calculation errors, instrument calibration, and sample preparation. Then initiate an OOS investigation, repeat the test, and document findings before escalating.

2. 6

   During an HPLC run, you notice baseline noise and drifting retention times. How do you troubleshoot?

   Suggest checking mobile phase degassing, column temperature, detector lamp, and pump seals. Mention reviewing recent maintenance logs and system suitability parameters.

3. 7

   How would you handle a situation where you realise you forgot to record a critical reading in the lab notebook?

   Emphasise honesty and following ALCOA principles (attributable, legible, contemporaneous, original, accurate). Explain that you would inform your supervisor and make a correction as per SOP, without backdating.

4. 8

   A colleague asks you to sign off on a test you did not perform. What do you do?

   State clearly that you would refuse, as it violates data integrity and GMP. Suggest reporting the request to a supervisor and documenting the incident as per company policy.

Behavioural and Teamwork Questions

1. 9

   Describe a time when you had to follow a detailed procedure under time pressure. How did you manage?

   Use STAR format: situation, task, action, result. Highlight prioritisation, attention to detail, and adherence to SOPs without compromising quality.

2. 10

   Give an example of a mistake you made in a lab practical or project and how you corrected it.

   Show accountability, corrective action, and learning. Avoid blaming others and emphasise process improvement.

3. 11

   How do you handle disagreements with a team member about a test result or procedure?

   Focus on data-driven discussion, referring to SOPs and literature, and escalating to a senior if needed. Show respect and collaboration.

4. 12

   Why do you want to work in quality control in the healthcare and pharma sector?

   Connect personal interest in patient safety, precision, and regulatory compliance. Mention desire to learn GMP and contribute to reliable diagnostics or medicines.

HR and Company Fit

1. 13

   Are you comfortable working in shifts, including night shifts, if required?

   Be honest about your flexibility. If yes, express willingness and mention ability to manage schedule. If no, discuss alternative arrangements politely.

2. 14

   What do you know about our company and the role you are applying for?

   Research the company's products, especially in diagnostics or pharma. Relate your skills to their quality needs and show enthusiasm for their mission.

3. 15

   Where do you see yourself in three to five years in this role?

   Show ambition to grow into senior QC or QA roles, gain certifications, and take on more responsibility. Align with company growth and learning opportunities.

4. 16

   How would you rate your communication skills, and how would you handle explaining a technical issue to a non-technical colleague?

   Highlight clarity, patience, and use of simple analogies. Give an example of simplifying a concept without losing accuracy.