Andrew Pazniak

• Designed and implemented a declarative decorator-based permissions system for NestJS, enabling scalable and composable access control across the application

• Built a unified background jobs abstraction over BullMQ, allowing seamless transition from in-process execution to distributed, multi-worker processing without significant code changes

• Developed a flexible invite system powering access sharing across multiple entity types, enabling effortless extension to new domains

• Implemented fine-grained share links system with per-link permission control, enabling anonymous access with capabilities beyond read-only, attachable to any resource

• Contributed to backend architecture of an AI-first product leveraging LLM APIs and post-trained models, focusing on scalability, composability, and developer ergonomics

• Owned access-sharing domain, working closely with designers to achieve a clean and effective user experience

• Authored a realtime collaborative Spreadsheets engine, like in Google Spreadsheets, but single-handedly, end-to-end

• Optimized performance of massive Angular components through event delegation and other techniques

Opensource platform for collaboration - own your data again

• Led the UI revamp in tight collaboration with UX team: from negotiating on the design system to laying out the front-end architecture

• Everyday hands-on development of the web client in React/Redux/Apollo/Typescript

• Designed the state management in the app to ensure that all UI components update in real time, fully reflecting the app's focus on collaboration

• Implemented some GraphQL resolvers in our Nest.js backend

• Assisted in recruiting, conducted interviews

• Provided guidance to developers with less React experience

Loan system focused around automated decision making

• Led the team in developing an innovative no-code system that allowed to compile financial strategies into code

• Established initial system design decisions that enabled sustainable product growth

• Designed solutions to address very specific challenges and custom features requested by major clients while keeping an eye on the system integrity

• Balanced between technical and business tradeoffs on daily basis in a rapidly changing startup environment

• Transformed business needs into technical requirements, keeping close contact with the company founder

• Crafted a very flexible and dynamic UI system together with the UX team, accounting to high expecting extensibility and flexibility.

• Developed an interview procedure that enabled us to hire the strongest ones

• Kept the team united and motivated through maintaining a supportive and friendly environment

Learn a language using interactive transcripts

• Created components for synchronization between videos and transcripts

• Contributed to open-source component libraries where they had missing or buggy features that we needed

• SDK: made our core components embeddable into 3rd party websites

• Made some optimizations of the existing Ruby codebase

clothing sizing app to make buyers happy + minimize returns

• Shipped an HTML5 app that felt like a native one in 2014

• From the idea to a published app in around a month

• Utilized Ruby tooling for asset packaging when Node.js front-end tooling was not that mature yet

• Did a transition from Backbone to brand new React JS while keeping both old and new tech stacks in the prod app at the same time without sacrificing performance

• Coded whatever React missed at the moment, like Router and state management based on best practices for reactive frameworks

• Built an Amazon Alexa app before voice assistants were a thing - using brand new AWS Lambdas

everything about sports, local and worldwide

• Ruby, Ruby and Ruby again - a lot of Ruby code on a daily basis, and not just Rails

• Built a very custom caching solution around a Rails app using brand new Node.js to help survive enormous peaks during sports events

• Kept the most popular online sports media in the country up and running

• Created an interface for live broadcasts of sports events online before the age of SPAs and modern JS frameworks

• Optimized a ton of SQL queries to enable us to grow without the constant need for bigger hardware

• Did infrastructure-as-code on bare metal using Chef