AI voice agent · iOS app and B2B web app

HaloAIAn AI agent that makes phone calls

It calls businesses in Serbian for people, and handles calls for companies.

Role

Product Designer (UX/UI)

Platforms

iOS, web app, B2B web app, website

Scope

Flows, UI, agent rules, evals

Interactive. The agent calls the recipient twice before the courier arrives. Turn the sound on to hear both calls.

iOS app

Plan, call, outcome

• Review before dialling. Opening line, questions, rules. For a listing: red flags and a first offer next to a secret maximum.
• Follow it live, or close the app and get the outcome as a notification.
• Outcome first. What was agreed leads; the transcript is there to check it.

Who and what

Plan from a link

Live call

Outcome

History

Voice

The app's interface is in Serbian, the language it calls in.

How it sounds

A used-car negotiation

Demo call1:18 · the seller's voice is generated

Fixed rules

Limits that don't depend on a prompt

Honest about itself

Says it's an AI assistant when sincerely asked.

No borrowed identity

Shows the user's number only after an SMS check.

The maximum stays secret

Never says the ceiling, even when asked.

No calls at night

Nothing starts or gets scheduled 9 pm to 8 am.

Evaluation

Real phone-line situations become tests

New situation on a test call→ Written as a test→ Instructions improved→ B2B uses the same agent

On the line	The test requires
An operator's recorded welcome	Don't treat it as voicemail.
"Press 2 for bills"	Press the right key.
A person finally picks up	Give the reason in one or two sentences.
Simulated salon, closed today	Book only after 16:30, repeat the details, invent nothing.

No model is trained on calls; the agent's instructions improve against the tests.

B2B web app

The same agent, with a company's controls

For operations managers, not technical people: less text, icons instead of status words, one primary button per page.

Overview. Live calls and people waiting for a human come first.

Live call. Listen, take over, or whisper to the assistant.

Automations. Trigger, assistant, outcome, success rate.

Assistant. Voice, role, knowledge, rules.

Designed for the Serbian market, in Serbian.