about denis
I am a mid-level software engineer at Ymaginator, focused on backend development and applied AI for SaaS products. I build APIs, databases and integrations with TypeScript, Node.js, Bun and PostgreSQL. I also work with React and Next.js when a product needs an interface.
I investigate problems across applications, databases and external services. My work includes payments, document processing, retrieval with source references, and deployment and recovery procedures. Each project explains the problem, the technical decisions and my role in the team.
see my work on Golan →AI-assisted development_
I develop with Codex. I use AI to explore solutions, write code and investigate problems; I remain responsible for technical decisions, code review and verifying the result.
I value teams with clear communication, autonomy, explicit priorities and a sustainable pace.
see issues I investigated and open-source fixes →mid-level software engineer · ymaginator · teresópolis, rj, brazil
denisdev
experience
professional experience · 2021 → present_
- I develop backends and applied AI for SaaS products. On Golan, I work with APIs, PostgreSQL and service integrations for financial investigation and credit-risk analysis
- I separated Next.js application backends into APIs with TypeScript, Bun and Elysia. I measured where time was spent, consolidated repeated reads and moved aggregations into PostgreSQL to reduce delays
- On Golan, I contributed to running investigations in separate environments and preparing those environments during deployment
- I set up deployment and recovery with Docker, Caddy and GitHub Actions: health checks, automatic rollback, daily backups and tested restoration
- On DesparaFit, with more than 2,000 active users, the account is created after purchase and a repeated payment notice does not duplicate the effect
- On AgroTax, I built assistants that retrieve documents and cite sources, with vector search, data isolated by customer and defenses against malicious instructions in files
- TypeScript
- Bun
- Elysia
- Python
- Kubernetes
- Drizzle ORM
- PostgreSQL
- Supabase
- Next.js
- React
- Docker
- GitHub Actions
- I consult on software architecture and backend optimization: what to measure, what to split, and what changes as usage grows
- I design databases mainly in PostgreSQL and use MongoDB when the project needs it
- PostgreSQL
- MongoDB
- I integrated the Meta Marketing API into a dashboard showing leads, spending, reach and cost per lead
- I implemented authentication, per-user database access rules and content publishing with Supabase and PostgreSQL
- I implemented consent for website analytics and IP address processing without storing the original address
- I built property development pages and automated email notifications with Resend
- Next.js
- React
- TypeScript
- Tailwind CSS
- Supabase (Auth, RLS)
- PostgreSQL
- Recharts
- Three.js
- Framer Motion
- Resend
- Meta Marketing API
- Vercel
- I used SQL and PostgreSQL to diagnose and correct data inconsistencies, tracing problems across systems to their source
- Handled more than 250 support tickets per month, resolving medium- and high-complexity incidents
- Ran functional tests across web and desktop applications and helped document and track more than 100 improvements and fixes
- Supported the team on complex cases, reviewed solutions, and helped prioritize what needed to be resolved first
- PostgreSQL
- SQL
- Web Platforms
- Desktop Applications
- Database Management
- Functional Testing
- I migrated parts of the backend from ASP Classic to PHP in stages to reduce risk and interruptions during updates
- Optimized database queries to reduce response times for the most important operations
- Reviewed the application, database, and infrastructure together to prioritize the improvements with the greatest user impact
- PHP
- ASP Classic
- SQL
- PostgreSQL
- AWS
- Performance Optimization
contact_
