Upwork home
Sign up
Project Catalog
DesignDesign
Video & AudioVideo & Audio
Development & ITDevelopment & IT
MarketingMarketing
Writing & TranslationWriting & Translation
MoreMore

You will get Full-Stack Developer to fix & refactor your codebase

Andrew Z.Status: Offline
Andrew Z. Andrew Z.
5.0
Top Rated
Preview image

Let a pro handle the details

Buy Web Application Programming services from Andrew, priced and ready to go.
Andrew Z.Status: Offline
Andrew Z. Andrew Z.
5.0
Top Rated
Preview image

Let a pro handle the details

Buy Web Application Programming services from Andrew, priced and ready to go.

Project details

I'm a full-stack developer who rescues messy or half-finished codebases. You get a clear audit, critical bugs fixed fast, and the worst areas refactored — without breaking what already works. As a full-stack developer I can take over front-end, back-end, or both, stabilize the project, and then keep building features. I've done this repeatedly: join an ongoing codebase, fix it, and grow the engagement from there.
Programming Languages
JavaScript, Python, TypeScript
Coding Expertise
Localization, Performance Optimization, Security

What's included $800

These options are included with the project scope.

$800
  • Delivery Time 7 days
  • Number of Revisions 2
  • Number of Pages 0
    • Source Code
5.0
7 reviews
100% Complete
(7)
1% Complete
(0)
1% Complete
(0)
1% Complete
(0)
1% Complete
(0)

MB

Michael B.
5.00
Apr 8, 2024
Improving internal infrastructure. Andrew made a great solution that works perfectly! I definitely would work with him on other projects.

AR

Adam R.
5.00
Apr 7, 2024
Seeking developers experienced with LAMP (Python) and REST APIs for UX Research Study / gsfd-2024-1 Andrew did a great job on a LAMP REST API deployment to Google Cloud. We'd be happy to work with this freelancer again.

AL

Amit L.
5.00
Jun 30, 2022
Edit & update two running telegram bots

ST

Siim T.
5.00
May 27, 2022
Backend developer Pyhton & Django That was a pleasure to work with Andrii. He is quite a professional and a huge fan of his work. He is honest and makes his best to explain the issue, always in touch and easy to communicate.Hope, we will work together again!

TH

Todd H.
5.00
Feb 25, 2021
Telegram Bot Needed For Questionnaire Very quick work. Completed what we hired him to do.
Andrew Z.Status: Offline

About Andrew

Andrew Z.Status: Offline
Full Stack Developer | MVP | Django Next.js Python TypeScript AWS
100% Job Success
5.0  (7 reviews)
Warsaw, Poland - 4:59 am local time
Software Full Stack Developer with over 6 years of experience as a Full Stack engineer. I build MVPs, Backends, Full Stack apps, Data pipelines, AI integrations, Chatbots, CI/CD pipelines and infrastructure, custom CRM & ERPs, and other kinds of business software as a Full Stack Developer.

As a Full Stack Developer, I have helped build different types of projects:
📌 QR codes generation SAAS, over 14 types of QRs (Full Stack delivery).
📌 FinTech debt collection SAAS.
📌 AI prediction for logistics.
📌 Restaurant QR code Menus and Management with POS integration (Full Stack build).
📌 FinTech credit scoring (Full Stack work).
📌 E-tendering with escrow (Full Stack development).
📌 Gen AI adoption for Business (Full Stack development & AI integrations).

Tech Stack I use as a Full Stack Developer:
🚀 Frontend (Full Stack): JavaScript/TypeScript | Next.js, Angular.
🚀 Backend (Full Stack): Python | Django, DRF, FastAPI, PostgreSQL, MySQL, NoSQL, MongoDB.
🚀 Infrastructure: AWS (EC2, S3, RDS, Aurora, Lambda, EKS, ECR), GCP, DigitalOcean, Docker, Docker Compose, Kubernetes.
🚀 CI/CD: GitHub actions, GitLab workflows, Buildkite. (Full Stack coverage: Backend & Frontend + CI/CD)

✅ Hire me as your Full Stack Developer if you want to talk Tech in Business language.
📌 You want to set up a new project? As a Full Stack Developer, I will prepare the roadmap and propose the best Architecture and technology stack!
📌 You want to refactor your code? As a Full Stack Developer, I will execute a safe transition and make sure nothing is left behind!
📌 You have an ongoing project? As a Full Stack Developer, I will quickly fit in and support the team and Business goals!
📌 You are looking for one place to build your project? As a Full Stack Developer, I will take care of the Full Stack build end to end!
📌 You have Backend / Frontend covered? That's fine, I don't just work as a Full Stack Developer on the entire stack, but can also work on separate components of your project as part of your Full Stack team!

💪 More about my Full Stack Developer skills that will help us achieve the best result:
✅ Numpy/Pandas, Apache Spark, Apache Airflow
✅ Test Driven Development & Domain Driven Design (Full Stack approach)
✅ Django/Django Rest Framework (DRF), FastAPI, Flask, Celery, SQLAlchemy (Full Stack Backend)
✅ AWS, Docker, Kubernetes (Full Stack infrastructure)
✅ MySQL, PostgreSQL, SQLite, Microsoft SQL, Alembic
✅ NoSQL, MongoDB, Redis, Elasticsearch (Full Stack data layer)
✅ AI Integrations
✅ Events based systems
✅ API integrations, REST & RESTful API, Database, WEB development, API development, API integration

Let's do it together as your Full Stack Developer!

Steps for completing your project

After purchasing the project, send requirements so Andrew can start the project.

Delivery time starts when Andrew receives requirements from you.

Andrew works on your project following the steps below.

Revisions may occur after the delivery date.

Audit

I review the codebase and reproduce the issues; we agree priorities and scope.

Fix & refactor

I fix the critical issues and refactor the worst areas without breaking what works.

Review the work, release payment, and leave feedback to Andrew.