Product development
From a business need to a working product.
- First release and core user journeys
- Interface, API and integrations
- Product launch and ongoing development
Development. Architecture. AI solutions.
I help build products, design systems and bring AI into your workflows.
Danila Karnatsevich. I design systems and write code.
From a business need to a working solution
How I can help
I can tackle a specific challenge or take your product from concept to launch.
Systems architecture
I design new systems and help existing ones evolve without unnecessary complexity.
Service boundaries, data, integrations, performance and reliability.
Discuss architectureAI solutions
I help integrate AI into products and automate repetitive tasks.
Document search, data processing and assistants for everyday workflows.
Discuss an AI solutionEnd-to-end product development
Running in production
A paid B2B SaaS product: from company details and product catalogs to an editor, PDFs, public links and payments.
I designed and built the entire product: interface, backend, monetization and operations.
423
accounts downloaded PDFs
of their documents
60
accounts with approved
payments
Engineering behind the product
Documents and PDF
A shared foundation for preview and PDF, font and image preparation, concurrency limits and failure diagnostics.
Payment processing
Webhook signature verification, duplicate processing protection and reconciliation with the provider when a notification is missed.
Events and analytics
A canonical event log, an analytics delivery queue, retries and personal data controls.
How we work
At every stage, you know what we are doing, why and what to expect.
Understand
Business needs, the existing system, constraints and success criteria.
Design
Architecture, decomposition and a clear scope for the first stage.
Build
Short iterations, demos and feedback on working software.
Launch
Deployment, documentation and handover. Ongoing support when needed.
Danila Karnatsevich
Independent software engineer
I design systems, write code and take changes into production myself. You discuss the work directly with me, and I take responsibility for the technical decisions.
- Systems architecture
- APIs, data and complex business rules.
- Integrations and payments
- Authentication, billing and external services.
- Documents and processing
- HTML/PDF, background tasks and retry models.
- Production and delivery
- Observability, CI/CD and diagnostics.
Let's discuss your project
A short description of your task, workflow or product idea is enough to start.
Tell me what you want to build, improve or automate. I will suggest a first stage and a way to work together.