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Kostandin – React, Node.js, AWS, experts in Lemon.io

Kostandin

From Albania (GMT+2)

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Full-stack Web DeveloperSenior
Hire developer
12 years of commercial experience
Adtech
AI
Consulting services
Fintech
Productivity
Proptech
Chatbots
SaaS
Video streaming software
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Kostandin – React, Node.js, AWS

After founding and running his own startup for some time, Kostandin has recently decided to step back from business ventures to focus on contracting again. Specializing in full-stack development with React and Node, Kostandin has a strong interest in contributing to projects related to fintech, edtech, or other domains! Recently, this candidate was able to grow his expertise by working with AI and architecting LLM pipelines. During our vetting process, he demonstrated solid knowledge of relational and non-relational databases and familiarity with production network setup and CI/CD practices, and apperaed to be well-positioned for future leadership roles!

Main technologies
React
7 years
Node.js
8 years
AWS
3 years
Next.js
2 years
Typescript
5 years
Additional skills
Kubernetes
Redis
MongoDB
Docker
Terraform
.NET Core
OpenAI
FFmpeg
Express.js
ElasticSearch
LangChain
LLM
Azure DevOps
Redux
Supabase
Stripe API
Ready to start
16 Sept 2024
Direct hire
Potentially possible

Experience Highlights

Co-founder, Product Engineering
Feb 2021 - Apr 20243 years 2 months
Project Overview

An AI-powered platform that streamlines video presentations for product marketers by automating tasks like brainstorming, copywriting, and styling while generating realistic avatars, voices, and visuals based on the content.

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Responsibilities:
  • Co-founded a bootstrapped company that began as a microlearning app with interactive videos;
  • After struggling to find product-market fit, pivoted to AI-generated videos for product presentations, achieving 20,000 users through product-led growth and 30% month-over-month user growth;
  • Architected the multimedia LLM pipeline, incorporating speech and video models, developed a feature-rich video editor using React.js and Node.js and built a video processing service with FFmpeg and Pupeteer to deliver the final presentations;
  • Led customer interviews to quickly iterate on product features while handling customer support, direct sales, and partnerships.
Project Tech stack:
React
Node.js
Typescript
Redis
MongoDB
Kubernetes
AWS
OpenAI
FFmpeg
LangChain
Technical Lead
Aug 2023 - Feb 20246 months
Project Overview

A SaaS platform that empowers product owners to prototype niche ideas on a parametrized RAG framework rapidly.

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Responsibilities:
  • Led a team of three full-stack developers to deliver two key components: the RAG Engine (a customizable AI pipeline with abstract services driven by configurations) and a GrantGrid Platform (specialized implementation on top of the engine designed for grant writing);
  • Designed the backend architecture and maintained the core library;
  • Improved the LLM pipeline, resulting in a 40% performance boost and improved observability, which led to a 25% reduction in debugging time and more consistent outcomes;
  • Worked closely with the CEO and GTM leader to test various product hypotheses while sustaining development velocity.
Project Tech stack:
Typescript
Next.js
Vercel
PostgreSQL
LLM
LangChain
OpenAI
Claude LLM
React
Qdrant
Lead Software Engineer
Jul 2018 - Jun 20212 years 10 months
Project Overview

The candidate was leading the development of multiple projects: a UWP bot for Microsoft's store product recommendations; a fintech investment platform related to secondary markets; a fintech platform for investment providers aggregation; a video conferencing web app with interactive presentations.

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Responsibilities:
  • Led a team of four senior full-stack engineers in delivering multiple products using Node.js, React.js, Redux, AWS, Docker, and Terraform;
  • Architected a modular and testable backend with 90% test coverage;
  • Designed the front end with Redux sagas for improved separation of concerns, ensuring scalability and enhanced testing as the app grew to support more services;
  • Architected the WebRTC and frontend of CloudMeet, an internal video conferencing tool designed to support up to 500 participants, featuring interactive elements like real-time presentation interactions and chat;
  • Collaborated with managers and senior engineers on the Core team to standardize processes, providing guidance, documentation, and boilerplates to enhance team efficiency in the JavaScript department;
  • Interviewed and hired over 10 senior engineers during the company’s rapid growth;
  • Assessed potential technical debt in incoming projects, reducing future maintenance costs.
Project Tech stack:
Node.js
Typescript
React
AWS
.NET Core
PostgreSQL
Terraform
Docker
Azure DevOps
Redux
Tech Lead
Oct 2017 - Jul 20188 months
Project Overview

A JavaScript-focused engineering agency that collaborates with German clients to develop mid-to-large scale SaaS platforms. Projects the candidate contributed to included an HR SaaS tailored for the German market and a digital real estate management SaaS serving the local market as well.

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Responsibilities:
  • Led a team of five full-stack engineers in delivering both projects, providing technical guidance, conducting code reviews, and overseeing software architecture;
  • Refactored the HR SaaS from a legacy codebase to a Node.js API with GraphQL to accelerate development and enable graph querying;
  • Implemented an advanced role-based access control service in Redis, allowing for highly granular client configurations;
  • Collaborated with the founders on establishing company standards, including process documentation, codebase quality definitions, project reviews, CI/CD pipelines, and a standardized stack centered on Node.js, React, Postgres, and AWS.
Project Tech stack:
JavaScript
React
Node.js
Express.js
MongoDB
PostgreSQL
AWS
Terraform
Redux
Senior Full-Stack Engineer
Apr 2016 - May 20171 year 1 month
Project Overview

An AdTech Marketplace providing OEMs like ZTE and USCellular with customizable web monetization features through numerous integrations.

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Responsibilities:
  • Improved the platform performance by 30% to support millions of clients' users by caching with Redis, improved MongoDB aggregations, and offloaded to queues.
  • Initiated the decoupling of monolithic code to the React front end to improve the feature development without too much technical debt.
Project Tech stack:
JavaScript
MongoDB
Redis
ElasticSearch
Node.js
React
Lead Software Developer
Apr 2015 - Apr 20161 year
Project Overview

A software agency that builds desktop, web and mobile applications for local and European clients

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Responsibilities:
  • Built the team from scratch, recruiting peers from university and mentoring their way to full-stack engineering with Java Spring, AngularJS, Postgres, and Hibernate;
  • Supervised the development cycle of 5 medium B2B products for local and regional markets, including workout platform, car rental SaaS, and e-commerce;
  • Worked closely with the founder and lead designer to build product specifications from direct discussions with the clients.
Project Tech stack:
Java
Hibernate
Angular
Cordova
JavaFX
Spring Boot
PostgreSQL
Node.js

Education

2015
Computer Science
Undergraduate

Languages

German
Pre-intermediate
Albanian
Advanced
English
Advanced
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