Dusan Hajlo
Open to work10 years experienceSenior Software Engineer
Senior Full Stack Engineer specializing in TypeScript, Node.js, React, and PostgreSQL.
Standing Rank
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Developer Badges
Skills & Technologies
51 skillsWork Experience
Senior Engineer
Qantev
- Built and maintained the company Next.js web app (App Router) for marketing, onboarding, and dashboards using React Server Components , Server Actions for form submissions, and Tailwind CSS ; deployed on Vercel with CI/CD for fast iteration.
- Led development of a cross -platform React Native app for iOS and Android with feature parity, using TypeScript and modern hooks for clean, maintainable code; built custom native modules (Swift, Kotlin) for camera, biometrics, and push notifications.
- Designed reusable component architecture (atomic design) and a Storybook design system aligned with Figma; established design tokens and shared primitives for consistency across mobile and web.
- Built a ChatGPT-style conversational UI with streaming LLM responses (incremental token rendering), can cellation, reconnect/retry, and graceful degradation; integrated real-time updates via WebSockets/ SSE for long-running tasks.
- Implemented state management with Redux Toolkit and Zustand integrated with REST + GraphQL back ends, handling pagination, caching, and optimistic updates.
- Developed Node.js/ Express (or NestJS) back -end services for auth ( OAuth2), RBAC, and LLM orchestration; deployed on AWS ( ECS/Fargate or Lambda) with RDS/ PostgreSQL and ElastiCache/ Redis; used S3 for file uploads and CloudFront for static assets and CDN.
- Configured AWS infrastructure for backend and web: ECS task definitions, ALB health checks, S3 buckets and IAM policies, CloudWatch logging and alarms; containerized services with Docker and automated CI/CD via GitHub Actions for App Store/ Google Play and Vercel for Next.js.
- Optimized performance: reduced bundle size (code splitting, lazy loading, memoization); profiled frame rates and memory for 60fps on lower-end devices.
- Managed CI/CD with GitHub Actions and Fastlane for App Store and Google Play ; strengthened quality with Jest, React Testing Library, and Detox E2E.
- Used Cursor, Claude, and Copilot for prototyping and scaffolding; mentored engineers and contributed to RFCs and architecture decisions.
Software Engineer
AI Dynamics
- Delivered enterprise web applications using React, Next.js, TypeScript, and Node.js ( Express), owning feat ures end-to-end in an Agile environment; built scalable services on AWS ECS /Fargate with health checks, autoscaling, and ALB; used RDS ( PostgreSQL) and S3 for data and file storage, CloudFront for static assets.
- Built and maintained AWS-hosted back ends: Lambda functions for serverless APIs and event -driven workflows, API Gateway for REST/ GraphQL; VPC and security groups for RDS and ElastiCache ( Redis); CloudWatch for logs and metrics; Docker images in ECR for ECS deployments.
- Rebuilt and extended client dashboards and admin UIs using Next.js (App Router) with React Server Components and Server Actions ; queried data with Prisma/ PostgreSQL, implemented Tailwind CSS and Shadcn/ Mantine for consistent UI; improved Core Web Vitals and SEO where required.
- Set up full -featured development environments from scratch: Webpack/ Vite, ESLint, Jest, Storybook, error handling (Sentry), and project structure; migrated component libraries to TypeScript for type safety and maintainability; proposed and adopted Next.js for new greenfield projects with testing, linting, and streamlined deployment ( Vercel or Docker).
- Translated Figma designs into modular, reusable React components with responsive behavior and Tailwind CSS/ Styled- components; integrated REST and GraphQL APIs with React Query for data fetching and cache invalidation.
- Built Node.js REST APIs with OAuth2, RBAC, and PostgreSQL/ Redis; implemented GraphQL resolvers with caching where appropriate; streamlined GitLab/ GitHub CI/CD for faster, reliable deployments.
- Implemented offline-first architecture with local persistence and background sync for healthcare and field use cases; standardized OAuth2 token-based auth across multi-service back ends.
- Added Cypress E2E tests for critical flows; conducted code reviews and mentored developers on React/ Node.js best practices
Full Stack Engineer
INSSIO
- Built responsive, data-driven web applications using React, TypeScript, Node.js, and PostgreSQL for clients in fintech and e- commerce
- Designed and implemented REST APIs with Express.js and Django, serving 50K+ daily active users
- Migrated legacy jQuery frontends to React with TypeScript, improving maintainability and performance
- Managed deployment infrastructure on AWS (ECS, CloudFront, RDS) and set up CI/CD with Jenkins and GitHub Actions
Projects
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Leaderboard Standings
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Assessment Highlights
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AI Collaboration Score
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Role Compatibility Profile
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About Details
Professional Bio
Senior Full Stack Engineer with 10+ years of experience delivering end-to-end features across backend and frontend. Proven SaaS and B2B experience at fast-growing product companies, specializing in TypeScript, Node.js, React, and PostgreSQL.
Bachelor of Science in Computer Science
Tallinn University (2012 - 2016)