You will get Full Stack Web App Development | MVP | Full Stack developer
Project details
Launch a production-ready SaaS in under a month. I architect, code, test, and deploy a secure, scalable Node.js (NestJS, possibly .net ) back-end and React / Next.js front-end—battle-tested on FinTech & B2B platforms serving 50 k+ MAU (have limited experience with Python , PHP , Lavarel & Wordpress). You get clean code, cloud-agnostic IaC, and a crystal-clear roadmap for future features.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Localization, Performance Optimization, SecurityWhat's included $19,999
These options are included with the project scope.
$19,999
- Delivery Time 14 days
- Number of Revisions 4
- Number of Pages 1
- Design Customization
- Content Upload
- Responsive Design
- Source Code
About Sviataslau
Full Stack Developer | Node & React & AI Web Development | SaaS & MVP
Gdansk, Poland - 8:51 pm local time
✅ 10+ years crafting lean, scalable SaaS products | 40+ Full Stack MVPs | $120 M+ client revenue generated | 15 M+ MAU
✅ Europe-based Senior Software Engineer • 24 h SLA • urgent start < 48 h
✅ React • Node.js • MERN • Tailwind • Next.js • Stripe • GPT-4 • PostgreSQL • Supabase • AWS Lambda • AWS Architect
✅ Data-driven mindset — Customer Data Platform dashboards, Stata Data Analysis, Data Analysis Python 📊
✅ 99.97 % uptime | < 0.1 % failed payments | 42 % average performance boost
✅ Cloud-native mindset: AWS, Docker, CI/CD — zero-downtime releases
✅ Proven partner for startups & enterprises in FinTech, HealthTech, e-Commerce
I help founders, product teams and enterprises build **Web, Mobile, Data & AI Applications** that scale.
From refactoring a legacy website to launching a multi-tenant, multivendor B2B SaaS platform with real-time analytics, I deliver proven architecture, clean code and measurable business impact.
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🌟 WHY CLIENTS CHOOSE ME
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📈 Business-Focused Delivery – map every feature to KPIs, double retention, cut churn; enable SaaS Business Development
🔧 Technical Excellence – documented code, full test coverage, micro-services & API-developer best practices
🔄 Transparent Workflow – daily Git commits + Loom demos, weekly roadmap review, SaaS Blog-style changelogs
🤝 Founder Mindset – optimise burn rate & bookkeeping, align branding, support go-to-market
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🛠️ CORE TECH STACK
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FRONTEND 💎 React • React.js • Next.js • Vue • Angular • TypeScript • Tailwind CSS • CSS/SCSS • Figma • Storybook
BACKEND ⚙️ Node.js • backend NodeJS micro-services • PHP • Laravel • NestJS • Express • .NET Core • Golang • REST API • GraphQL • Supabase • OAuth2 • Java
DATA & ANALYTICS 📊 PostgreSQL • MongoDB • MySQL • Redis • DynamoDB • ElasticSearch • TimescaleDB • Python (Pandas, NumPy) • Stata • Multicharts • AWS QuickSight
DEVOPS 🚢 Docker • Kubernetes • GitHub Actions • AWS Lambda • AWS ECS/EKS • Terraform • Vercel • CloudFront • S3
INTEGRATIONS 🔗 Stripe • Auth0 • Twilio • GPT-4 • LangChain • ChatGPT API • Supabase Auth • SendGrid • Headless CMS • Booking Engines • Payment Gateways EU/US
AI & ML 🤖 OpenAI • LangChain • Vector DB (Pinecone) • Recommendation Engines • Custom Generation Pipelines
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📊 EXPERIENCE SNAPSHOT
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• Re-platformed booking web app (300 K MAU) → MERN; load ↓ 42 % • conversions ↑ 31 %
• Built Customer Data Platform for SaaS B2B: unified 25 M events/day, enabled cohort analysis in Supabase
• Engineered Stripe flow 50 K payments/day @ < 0.1 % fail, PCI-DSS compliant
• Integrated AI generation → marketing output ↑ 3× • CAC ↓ 18 %
• Guided FinTech startup from wireframes to multi-tenant MVP in 21 days → raised $1.2 M seed
• Optimised GraphQL gateway: server cost ↓ 35 % • p95 response ↓ 280 ms → 80 ms
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🗺️ PRODUCT LIFECYCLE
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1️⃣ DISCOVERY – free 30-min call → written Blueprint & estimate in 24 h
2️⃣ SPRINT BUILD – 1-week iterations, Cypress/Jest tests, Storybook demos
3️⃣ LAUNCH – deploy to AWS Lambda & Vercel, configure monitoring & alerts, docs & training
4️⃣ SCALE – add AI modules, API microservices, Supabase Auth, multivendor catalog, 24×7 support contract
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🧰 SERVICE MENU
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• FULL STACK DEVELOPMENT – React, Next.js, Node.js, PHP, Laravel, MERN, Tailwind, Postgres, Supabase
• BACKEND ENGINEERING – API Developer for micro-services, GraphQL, AWS Lambda, multi-tenant SaaS, CMS
• DATA ANALYTICS & REPORTING – Data Analysis Python, Stata Data Analysis, Multicharts dashboards, BI & KPI
• STRIPE / PAYMENT API – subscriptions, VAT, 3-D Secure, Apple/Google Pay
• AI/LLM INTEGRATION – GPT-4 chatbots, LangChain agents, content generation pipelines
• URGENT SUPPORT 🆘 – Senior Engineer on call in 2 h for critical fixes
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🌍 INDUSTRIES & USE CASES
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FinTech • HealthTech • e-Commerce • SaaS B2B • SaaS Branding & Bookkeeping • Booking Platforms • Workflow Automation • Marketplace • Trading Systems • CMS
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📈 ENGAGEMENT & AVAILABILITY
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• Fixed-price MVP (2-4 weeks) • Agile T&M • Dedicated Senior Engineer augmentation
• UTC+2 base • Open for urgent & roadmap projects • EU VAT entity
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💬 NEXT STEP
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Send your spec or one-liner idea — I’ll reply within 24 h with roadmap, timeline & quote.
Ready to build? Hit the green “Invite to Job” button and let’s launch something remarkable together! 🚀
— Slava (Sviataslau) • Your Full Stack Partner • Founder @ Selênos Systems
Steps for completing your project
After purchasing the project, send requirements so Sviataslau can start the project.
Delivery time starts when Sviataslau receives requirements from you.
Sviataslau works on your project following the steps below.
Revisions may occur after the delivery date.
Week 1 – Blueprint
• Kick-off call (goals, KPIs, personas) • UX wireframes • Entity & API schema
Week 2 – Build
• NestJS REST/GraphQL API • Auth (JWT/OAuth) • React UI with Tailwind • CI/CD pipeline (GitHub → Docker → AWS/GCP)