Prompting Text-to-Speech Models in 2026
Amongst other innovations, new text-to-speech models have introduced new capabilities and controls. In voice agents, this means leaning into new prompting best practices and patterns.
Josh Lawman
AI Expertise
What we build
Customer Agents
Customer-facing agents for WhatsApp, SMS, voice, and chat with low latency and robust guardrails.
Internal Agents
Agents for internal teams - company knowledge base Q&A, reporter writers, employee assistants, and workflow helpers accessible via a web UI, Slack, or Teams.
Data Intelligence
RAG systems, document analysis, and automated insight detection from structured data.
Agent Interfaces
Custom dashboards and UIs for teams to interact with, monitor, and review their AI tools.
ML & Model Development
Trained ML models and fine-tuned LLMs tailored to your specific use case and data.
Eval Frameworks
Security testing and evaluation systems for AI products.
Is Adder Right for You?
Cut through the noise
Adder is right for you if...
- You have identified ways you can make your staff more efficient with AI, but you need custom tools
- You need an expert you can trust to help execute your AI strategy
- You built an internal demo that mostly works (but your team is not equipped to get it ready for customers)
- Building your AI projects internally is taking a lot longer than it should.
We might not be the right fit if...
- –You need a large team of 5+ engineers for an enterprise-wide transformation
- –Your AI needs are tightly linked with hardware requirements (e.g. running local models on low-compute devices, on premise LLM requirements)
- –Your use case would be better served by no-code tools given the scale, simplicity, or lack of customization required
Not sure which category you fall into? Book a 20-min Call and we'll tell you honestly.
Your Product Story
The complete journey from idea to scale
Every successful product has a story. Here's how yours unfolds - with clear milestones, rapid improvement, and room to adapt along the way.
Chapter
1
Discovery & Scoping
Week 0
We start with a conversation. You share your vision, we ask the hard questions, and together we define what success looks like.
- 20-minute scoping call
- Technical feasibility assessment
- Detailed project proposal
- Fixed-price quote
Chapter
2
Validate your idea
The MVP Build
3 weeks
A production-ready product your pilot users can actually use. You'll see progress every week with demos and opportunities for feedback.
- Full-stack development
- Production infrastructure & CI/CD
- Deployed and ready for pilots
- Source code & documentation
- You own all the IP
Chapter
3
Internal Testing
2 weeks
You and your team test the product internally. We iterate based on your feedback, fix issues, and polish before external users see it.
- Bug fixes and refinements
- Team feedback sessions
- UX improvements
- Launch preparation
What's next after the MVP?
Chapter
4
Roll out to customers
V1 Development
4–8 weeks
Your pilot users loved it and it's now time to prepare for a wide-scale launch. Updated features based on real feedback, integrations with your existing tools, and everything needed for a wider rollout.
- Features updated from pilot feedback
- Integrations (Slack, Teams, Stripe, Google Drive, S3, etc.)
- Landing page & onboarding flow
- Performance & security hardening
- Full launch support
Chapter
5
V2 and Beyond
Ongoing
The best products evolve. When you're ready for V2, a companion app, or something entirely new - we already know your stack, your users, and your vision.
- New features & iterations
- Adjacent products
- New integrations
- Scale & expansion
Pricing
Build your AI product
Fixed-price development to get your product launched
Start here
Baseline MVP
$10k
Start piloting your product in 3 weeks
Full-stack development
3-week delivery
Deployed at demo.yoursite.com
You own all the IP
Source code & documentation
Mobile-responsive design
60-day post-launch support
Evals & Monitoring
+$5k
Add observability and guardrails to your MVP
Analytics dashboard
Fine-tuned models
Model usage insights
Live model evaluations & guardrails
Performance monitoring
Fractional AI Engineering
/mo
High level strategy meets hands-on execution
2–4 small/medium features bi-weekly or 1 large feature monthly
Full Maintenance: Bug fixes, error monitoring, model updates, and dependency updates included
Bi-weekly written updates
Bi-weekly strategy call
Direct access for rapid iterations
People who work with us say
I've had the pleasure of working closely with Josh at Adder, and his impact on our projects cannot be overstated. Josh is exceptionally knowledgeable, particularly when it comes to the rapidly evolving landscapes of emerging tech and AI. He doesn't just keep pace with industry shifts; he stays ahead of them.
Beyond his technical prowess, Josh is a standout collaborator. He has a rare ability to translate complex concepts into actionable strategies that both clients and team members love. If you have the opportunity to bring Josh onto a project, I cannot recommend him highly enough.
Charlie Bartle
COO at Zygens
No one has taught me more about using AI than Josh Lawman. Every time I speak with him I learn something new. If you get the opportunity to work with Josh I'd strongly recommend it.
David Batey
Co-Founder at DefendDomain
Josh is incredibly talented at developing systems and has a fundamental understanding of system design, UI, and overall is structured very well for success.
I'm incredibly grateful to be working with him, and I look forward to a long-lasting relationship and hopefully other exciting projects in the future. Would highly recommend him, what a superstar!
Mark Jacob
Head of Property Management Europe at CitizenM
Josh brings a rare combination of strong technical depth and a genuinely product-led mindset. In our conversations he was able to quickly understand the problem space, think creatively about how generative AI could be applied in a practical way, and translate ideas into clear, actionable approaches. I'd happily recommend him to any team looking to explore and build new AI-driven products.
Divya Valipe
CEO at SquadBid
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