Freelancer profile translated to English.

Description

🚀 Full-Stack Developer — SaaS, Internal Tools & AI Automations

I help companies transform an idea, a business need, or a manual process into a reliable, clear, and production-ready web application.

I work on projects such as: SaaS platforms, internal tools, dashboards, client portals, custom CRMs, business automations, AI integrations, robust APIs, and secure deployments.

🧩 What I Can Handle

I can be involved from conception to operation:

Framing the need and translating business challenges into technical solutions
Designing the architecture: frontend, backend, database, API, roles, and permissions
Developing complete, maintainable, and scalable web applications
Integrating external services: Stripe, OAuth, webhooks, emailing, AI, business tools
Industrializing: testing, CI/CD, Docker, cloud, monitoring, deployments
Securing the application: OWASP, access management, API security, secrets, server hardening
Taking over, auditing, or evolving an existing application

⚙️ Core Stack

Frontend:Next.js, React.js, TypeScript, Tailwind CSS

Backend:Node.js, NestJS, Django REST, Fastify, REST API, GraphQL

Database:PostgreSQL, Prisma, Redis, SQL

Architecture:Microservices, System Design, SaaS, External API Integration

DevOps & Cloud:Docker, AWS, CI/CD, GitHub Actions, Kubernetes, Terraform, Nginx, Linux

Security:OAuth 2.0, OpenID Connect, JWT, OWASP Top 10, API Security, DevSecOps

Quality:Jest, Playwright, Cypress, Unit/Integration Tests

Integrations:Stripe, Amazon SES, Resend, Cloudflare, Webhooks

🎯 My Approach

I build clean solutions tailored to real-world usage: clear architecture, solid code, controlled deployment, and a strong focus on security.

📩 Have an application to build, an internal tool to improve, or a process to automate? Let's talk about your project.

Industry field of expertise

Languages

French
Native or bilingual
English
Fluent
Spanish
Basic

Workplace preferences

Can work on-site

Toulouse (up to 50km)

Mission freelance - Cabinet médical d’échographie
Full-Stack & DevOps Architect
MEDICAL
May 2026 - June 2026 (1 month)
Toulouse, France
Design and development of a medical appointment booking platform for an ultrasound practice, including a public website, secure patient portal, and a comprehensive back-office.

I was responsible for the full-stack architecture of the project: Next.js, NestJS/Fastify, PostgreSQL/Prisma, Redis/BullMQ, shared Zod schemas, email notifications, Railway/Docker deployment, and GitHub Actions CI.

The project includes an advanced scheduling engine, management of calendars, patients, users, roles, audit logs, phone OTP, server-side validation, Vitest/Playwright tests, and release scripts with smoke tests, migration audits, performance, and SEO.
Software Architecture Redis BullMQ Backend Service Development REST API
Mission freelance - SaaS de génération de documents visuels
Lead Full-Stack Engineer & SaaS Architect
SOFTWARE PUBLISHING
January 2026 - April 2026 (3 months)
Toulouse, France
Development of a complete SaaS platform with an advanced visual editor, user area, back-office, Stripe subscriptions, image exports, and production infrastructure.

End-to-end mission: full-stack architecture, Next.js/React frontend, NestJS/Fastify API, PostgreSQL/Prisma, shared Zod schemas, secure authentication, Google OAuth, uploads, audit logs, international SEO, GitHub Actions CI, Playwright tests, Railway deployment, backups, and monitoring.
Next.js NestJs Prisma Stripe Playwright
Agence de développement logiciel
Full-Stack Engineer & Application Architect
SOFTWARE PUBLISHING
July 2025 - January 2026 (6 months)
Toulouse, France
Complete development of a business web platform dedicated to managing sports tournaments: registrations, groups, brackets, results, historical ratings, archiving, and organizer/player/admin areas.

Architecture based on Next.js, Django REST Framework, and PostgreSQL, with enhanced security through JWT, granular permissions, Turnstile, CSP, and authenticated WebSockets. Industrialized production deployment on an OVHcloud VPS under Linux with Nginx/systemd, AWS SES emailing, and quality coverage including over 300 automated tests, including backend tests and Playwright E2E tests.
DevSecOps Websocket Nginx Django Rest Framework Amazon SES

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Expert in Software Engineering Title
Epitech Toulouse
Programme Grande École

Nikita Borisenko

Next.js Full-Stack Developer — SaaS & AI

About Nikita

🚀 Full-Stack Developer — SaaS, Internal Tools & AI Automations

🧩 What I Can Handle

⚙️ Core Stack

🎯 My Approach

Experience

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