Senior Back-End Developer

Data provider from different blockchains | Nuant

Date: 04.2022 — Present

Project description

Node.js, Typescript, NestJS, Docker, PostgreSQL (TimescaleDB), Redis, MongoDB, Web3, Kubernetes, Kafka, GraphQL

Responsibilities

 I have implemented a custom JSON RPC calls for web3.

 I have implemented a custom API Gateway for fetching blockchain data (like blocks, transactions, traces, logs etc) with hot/cold cache layers using Redis and MongoDB.

 I have implemented real-time updates using WebSocket-like subscription mechanism.

 I have implemented a microservice for fetch-ing data from DeFi protocols (using job queue) and calculating analytics for users from this data.

 I have implemented a payment microservice that supports Stripe, Coinbase, BitPay payment methods.

Senior Back-End Developer

opinov8

Date: 09.2019 — 04.2022

Project description

Node.js, Typescript, Nest- JS, Docker, MySQL, Redis, RabbitMQ, WebSocket

Responsibilities

 Create core and nested stacks of application, then these stacks were synthesized into

CloudFormation template and deployed to the AWS.

I used Lambda functions and API Gateway for business logic.

Implement authorization mechanism.

In-app and push notifications using Expo

Project demo presentations to the client.

Back-End Developer

SafeSwiss

Date: 10.2018 — 09.2019

Project description

Node.js, Express, RabbitMQ, Redis, MySQL, MongoDB, OpenPGP.

Responsibilities

Created and optimized SQL tables + queries using knex ORM.

Developing security solutions (for example I implemented self-made DDos protection using Redis).

Design and code review.

Worked with encryption and related technologies OpenPGP, DHKE, RSA.