Why pre-screen bioplastic artisans before the interview
These materials are alive in a way conventional plastic is not. They absorb moisture, change shape with humidity, and a piece that looked beautiful in the studio can warp or grow mould in a customer's kitchen. Artisans worth hiring have watched their own work age and adjusted. A short screen asks what happened to a piece a year after it was made.
What actually matters when screening Bioplastic Artisan candidates
- 01
Body of work
Ask for photographs of finished bioplastic pieces: gelatin-glycerin sheets, algae or chitosan films, PLA-composite castings, mycelium panels. Check scale, finish quality, and whether pieces were sold, exhibited, or commissioned.
- 02
Craft and technique
Probe recipe control: plasticiser ratios, agar or starch sourcing, curing humidity, shrinkage rates, pigment and filler behaviour, silicone versus plaster moulds, sanding and sealing of brittle edges.
- 03
Reliability and process
Look for batch discipline: labelled recipe logs, drying times built into schedules, spoilage and mould contamination rates, how they met a 200 piece order with a material that shrinks unevenly.
- 04
Presence with an audience
Assess how they present the material to buyers, students, or gallery visitors: workshop teaching, market stalls, compostability claims, honest talk about lifespan and end-of-life handling.
Pre-screening questions to ask Bioplastic Artisan candidates
12 questions grouped by what they test. Ask the same set in every screen and score answers on a consistent scale, or send them as an async video screen and compare answers side by side.
Pieces that lasted
3 questions01Can you show examples of pieces or products you have made?
Listen forFinished work including older pieces, with what they would change now described honestly.
Only recently made work shown, or nothing kept long enough to see how it aged.
02Can you describe your experience producing bioplastics?
Listen forMaterials made from raw ingredients rather than bought, with batch quantities described.
Experience limited to using purchased sheet material, or no formulation work at all.
03Which types of bioplastic have you worked with?
Listen forSeveral material families named, with their different properties and limitations described accurately.
All bioplastics treated the same, or differences between them not understood.
Material practice real
4 questions04What techniques do you use to shape and form these materials?
Listen forCasting, moulding or forming described with drying and shrinkage accounted for in the process.
Shrinkage discovered after casting, or techniques described without any process control.
05Can you explain your process for developing a new material?
Listen forSystematic variation with records kept, so a successful formulation can be reproduced exactly.
Recipes developed by intuition without records, or successful batches that cannot be repeated.
06Do you have experience with natural dyes or pigments in this work?
Listen forColour behaviour understood including fading over time, with lightfastness tested rather than assumed.
Colour chosen without testing stability, or fading treated as an inherent charm.
07What tools and equipment are essential to your practice?
Listen forEquipment described with process control in mind, including temperature and humidity management.
No control over drying conditions, or equipment limited to what was immediately available.
Tested not assumed
3 questions08How do you test the durability and performance of what you make?
Listen forPieces tested over time in real conditions, including humidity, heat and repeated handling.
Durability assumed from the recipe, or no testing beyond the immediate finish.
09What precautions do you take to ensure your products are safe to use?
Listen forIntended use stated clearly, with food contact or skin contact claims only made where tested.
Food safety claimed without testing, or intended use left for the customer to assume.
10How do you ensure quality and consistency across batches?
Listen forIngredients weighed and conditions recorded, with batch variation checked before pieces are sold.
Variation accepted as part of the craft, or inconsistent batches sold without checking.
Honest claims
2 questions11How do you handle waste and by-products from your process?
Listen forOffcuts reprocessed where possible, with waste disposal handled honestly rather than assumed harmless.
All waste assumed compostable, or process water disposed of without consideration.
12How do you explain the benefits of these materials to customers?
Listen forHonest claims including the limitations, with compostability explained accurately by the conditions required.
Home compostability claimed for industrially compostable material, or benefits overstated.
How to score responses
Score every candidate on the same four criteria immediately after the screen. At this stage you are shortlisting for panel interviews, not making the final call.
Body of work
35%5Shows a coherent body of cast, moulded, or thermoformed bio-material objects with named commissions, exhibitions, or retail stockists behind them.
Craft and technique
25%5Quotes their own formulations by ratio, explains why a batch warps or blooms, and adjusts curing conditions deliberately rather than by guesswork.
Reliability and process
25%5Keeps dated batch records, quotes realistic lead times allowing for cure, and has delivered volume orders with documented reject rates.
Presence with an audience
15%5Explains bio-material provenance and degradation clearly to lay audiences, has run workshops or demos, and avoids overstated compostability claims.
These materials absorb moisture and change shape. A one-way video screen asks what a piece looked like a year on.
Try it on HirevireScreening FAQ
Process basics
How long should a pre-screening round for this role take?
Ten to fifteen minutes across eight to ten questions, answered async alongside images of their work. Enough to test material knowledge, durability practice and safety before a studio visit.
What should I ask for besides the screen?
Pieces you can handle, ideally ones made more than a year ago. How these materials age is the single most useful thing to see, and photographs will not show it.
Evaluating answers
What is the strongest signal when screening this role?
What happened to a piece over time. Artisans with real practice describe warping, moisture uptake or degradation and how they adjusted the formulation. Anyone whose work never changed has not kept any.
What should worry me in an answer?
Food contact or compostability claimed without testing. Both are regulated claims in most markets, and asserting them without evidence creates a real problem when a customer relies on it.
Go deeper on this role
Sanat has been hiring since 2012 and watching the recruitment industry change up close ever since, and turned that screening process into Hirevire's video screening platform. LinkedIn
