You will get a fullstack developer and starter kit
Top Rated
Top Rated
Project details
You will get a custom-built development starter kit that saves ~$15-20k in developing SaaS apps, complex dashboards, CRMs, HRMs, etc., and will help you build an MVP in weeks.
You can hire us for continued development or hire somebody to help you, if you are a non-technical person.
You can hire us for continued development or hire somebody to help you, if you are a non-technical person.
Programming Languages
JavaScript, TypeScript, C#Coding Expertise
Cross Browser & Device Compatibility, Localization, DesignWhat's included $399
These options are included with the project scope.
$399
- Delivery Time 1 day
- Number of Revisions 5
- Design Customization
- Responsive Design
- Source Code
23 reviews
(23)
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AP
Alvin P.
Nov 27, 2024
Valentyn is a true professional. He took the time to explain the scope of work. His SaaS started kit is impressive.
AR
Aidan R.
Mar 3, 2026
UI/UX Redesign + Frontend Refactor + Supabase Fixes/Refractor for AI Voice Agent SaaS Platform
DB
David B.
Dec 19, 2025
UX/UI for SaaS; Expert in Onboarding User Flow
It was a pleasure working together. Valentyn is a professional with the right skills for the job, clear communication, and the dedication to deliver. Thank you.
MP
Mitchell P.
Sep 12, 2025
React Front End Developer
MR
Max R.
Aug 1, 2025
Product manager/marketer for a small SaaS startup
Valentin did a great job helping me connect with our users, launch regular interviews, set up a systematic backlog, and run daily stand-ups with the developer.
As a result, our processes became much more transparent and effective, with clear priorities based on feedback from current and future users.
I definitely recommend Valentin for projects that involve product ownership, collaboration with developers, and design work.
As a result, our processes became much more transparent and effective, with clear priorities based on feedback from current and future users.
I definitely recommend Valentin for projects that involve product ownership, collaboration with developers, and design work.
AK
Andrii K.
Jul 29, 2025
60 minute consultation
Had a 1-hour consultation with Valentin - he was well prepared, reviewed all project materials in advance, and provided valuable insights on cloud architecture and microservices. He clearly explained the pros and cons of different approaches and helped identify potential bottlenecks. The session was efficient and informative. I plan to work with him again. Highly recommended.
About Valentyn
Fullstack SaaS Engineer & AI Developer React NodeJS Claude RAG agents
100%
Job Success
Chernivtsi, Ukraine - 5:08 am local time
Instead of hiring separate frontend, backend, and AI infrastructure engineers, I handle the entire product lifecycle — bridging the gap between robust, scalable full-stack architecture (NextJS, NodeJS, Python, AWS) and cutting-edge GenAI implementations (RAG pipelines, autonomous agents, and LLM orchestration).
With 10+ years in full-stack development, $200K+ earned on Upwork, and a 100% Job Success Score (Top Rated Plus), I build with an ownership mindset to ensure your MVP hits the market fast and scales smoothly.
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🌐 FULL-STACK & AI CAPABILITIES — WHAT I BUILD
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→ Full-Stack SaaS Platforms: Complete web applications with responsive UIs, secure multi-tenant auth, and complex business logic (React, NextJS, TypeScript).
→ AI Agents & Agentic Workflows: Multi-agent systems capable of autonomous execution, tool usage, and function calling (OpenAI, Claude, Gemini).
→ Production RAG Pipelines: Enterprise semantic search utilizing vector databases (Pinecone, pgvector, Qdrant) for accurate, private data querying.
→ Robust Backends & APIs: Highly performant, clean-code REST/GraphQL APIs and microservices (NodeJS, NestJS, Python, Express).
→ Automated Business Workflows: Intelligent document processing, automated lead scoring, and custom CRM/ERP AI integrations.
INDUSTRIES I SERVE WITH AI + WEB SOLUTIONS:
- Multifamily Real Estate — Custom web software layered over Yardi, AppFolio, Entrata, ResMan, RealPage, Apartments com
- Hospitality / Hotels / Restaurants — AI booking flows, guest communication platforms, and review automation dashboards
- MarTech / AdTech — Complete web analytics suites integrated with AdTech and MarTech API, and others like Meta, Google, TikTok, Yelp, and UberEats APIs
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🏆 RESULTS FROM RECENT PROJECTS
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✔ AI Voice Agent SaaS Platform — Complete frontend UI/UX redesign + Supabase backend refactor, delivered in 90 days ($7,000 fixed price, 5.0 ★)
✔ Senior NodeJS SaaS Integration — 816 hours of self-driven backend delivery on schedule across 6 months ($32,633, 5.0 ★)
✔ AI-Powered Real Estate Onboarding — Built the web frontend and AI backend workflow that reduced onboarding drop-off and boosted conversions.
✔ Enterprise Software — Systems built by my team are used daily by Cushman & Wakefield (Fortune 500 real estate firm).
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⚙️ TECH STACK
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AI / LLM Integration:
OpenAI API, Claude API, Gemini, LangChain, RAG, Vector Databases, Prompt Engineering, Function Calling, Structured Outputs
Backend Development:
Nodejs, NestJS, Python, Expressjs, Nextjs (Server Components)
Frontend Development:
React, TypeScript, Redux, Nextjs, Material UI, Tailwind CSS
Mobile App Development:
Flutter (Cross-platform, CI/CD with Codemagic)
Cloud & DevOps:
AWS (SQS, SNS, Lambda, RDS, ECS, ECR, CloudWatch, EventBridge, VPC, Route53, EC2), Terraform (IaC), Docker, Docker Swarm, Nginx
Databases & Caching:
PostgreSQL, MongoDB, MySQL, Redis, Pinecone, Qdrant, pgvector
API & Enterprise Integrations (50+ types):
REST / GraphQL / SOAP · OAuth2 / OIDC · Webhooks · ETL Pipelines · Payload Encryption
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🏢 ENTERPRISE & THIRD-PARTY INTEGRATIONS
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Property Management Systems (PMS):
Yardi Voyager · AppFolio · Entrata · ResMan · RealPage · Apartments com
Marketing & Social Platforms:
Meta (FB/IG) · Google Suite · Twitter/X · TikTok · Yelp · UberEats
Past Enterprise Client Impact:
STIHL · Liebherr · Cushman & Wakefield
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🤝 HOW WE WORK TOGETHER
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→ Discovery call → System architecture proposal → Milestone-based delivery
→ MVP in 6–12 weeks, production-ready scaling in 18–32 weeks
→ Available 30+ hrs/week, response time within 4–8 hours
→ Backed by a distributed team across 🇺🇦 🇵🇱 🇮🇹 🇷🇴 🇨🇦 if you need to scale resources rapidly
I prioritize long-term, high-trust partnerships over quick fixes — 29 completed projects with an average engagement of 12-24 months.
Let's jump on a call and map out what you're building.
Steps for completing your project
After purchasing the project, send requirements so Valentyn can start the project.
Delivery time starts when Valentyn receives requirements from you.
Valentyn works on your project following the steps below.
Revisions may occur after the delivery date.
A call
Let's set up a call and discuss your specific case.