Hire me
Hire an AI voice agent developer
One senior engineer who architects, builds and ships the whole thing, rather than a team to coordinate. Here is how that actually works.
Most people arrive here in one of two states. Either they have a voice agent running on Vapi or Retell and have hit a ceiling on cost, latency or control, or they have a product that needs a voice layer and nobody in-house who has shipped one to production.
I have spent the last year on the conversational layer of a consumer voice AI product that is live on Google Play, and fifteen years shipping software before that across more than eighty products. On Upwork the record is public: Top Rated Plus, 100% Job Success across every completed project, 1,383 tracked hours.
I will also tell you when not to hire me. If a managed platform already solves your problem, saying so costs me one project and saves you three months.
Three ways to work together
Project
Scope is clear and you want a fixed outcome
A defined build with milestones, a written architecture up front, and a documented handoff at the end. Typical voice agent projects run six to ten weeks.
Embedded
Requirements will move as you learn
Monthly retainer, working as part of your team, with the same written updates and architecture notes. Best when the product is still finding its shape.
Audit or advisory
You want a second opinion before committing
A few days reviewing an existing agent or a planned architecture, ending in a written recommendation. Often the cheapest useful thing I can do for you.
What I need to quote
- What the agent needs to do, in one or two sentences
- Where it runs: in your app, on a phone number, or both
- What it has to connect to, such as a CRM, calendar or internal API
- Roughly how many minutes a month you expect
- What you have already, whether that is a Vapi agent, a prototype, or nothing yet
- Any compliance or data-residency constraints
Practicalities
- Based in Ho Chi Minh City (GMT+7), working async-first with overlap hours for US and EU teams
- More than 30 hours a week available, open to long-term engagements
- Typical reply time under four hours
- You own all code, infrastructure and vendor accounts from day one
- Happy to work under NDA; several current engagements are
What I build
- Production voice AI, not prototypes
- LiveKit · Pipecat · OpenAI Realtime
- Twilio & SIP telephony
- Top Rated Plus on Upwork
- 100% Job Success
- 15+ years building software
- Direct communication with Tien
Direct Project Enquiry
Tell me what you are building
Share what you are building and where it is stuck. If a managed platform already solves it, I will say so. I review every enquiry personally and reply within about four hours.
- 1Send your project goal and the services you think you need.
- 2I review the context and whether I am the right fit.
- 3You get a direct reply with a practical next step.
International projects welcome
I work in English by email, video call or through Upwork, from GMT+7 with overlap hours for US and EU teams.
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