Position: Lead/Senior Ruby Developer
Category: Ruby
English level: fluent
Years of experience: 6

Scaling Sidekiq to >100M daily jobs on monolith application by sharding Redis instances. 

We were able to handle over 1.5x orders/second of projected load at the beginning of the project. Database peak load dropped ~30-40% supporting growth of the business. 

Leading a team on Rails upgrade journey (Rails 4.2->Rails 5.2). With a fleeting time to Ruby 2.7 end-of-life 

CI/CD improvements: Reducing build/specs time for application by 10-15%. Impact: higher developer efficiency, faster fixes to prod. 

Created easier to use, secure, seamless messaging system with an ability to communicate in real-time and with multiple actors became available for millions of users.
Ruby Technical Lead with 6 years of experience. I have worked with a lot of clients during my career analyzing their needs and helping them to grow their business. I have been working as a Technical Lead for the last 3 years supervising and helping the team to grow their potential. Most projects I worked on were Enterprise projects with high load, but I also participated in small applications and startups creation and support. 
Except that I was also highly involved in mentorships that took part in my company as well as in interviewing process.

My last project:
Project: Food delivery platform.

Working on extensions and changes to the infrastructure to make platform globally available and highly resilient. Working in a team to unlock the possibility for business to expand globally and serve more orders. Supported business growth during the pandemic, handled crucial changes to the Database, Redis, ECS services.

Responsibilities: 

Tech leading a team of 3-5 team members supporting them, advocating for Ruby best practices, and providing an ability to use their skills where they are most useful. 

Scaling Sidekiq to >100M daily jobs on monolith application by sharding Redis instances. 

Impact: more reliable, efficient, and error-prone background processing that can scale further if needed. 

Database optimizations: Choosing best way on how to optimize database load. Working with Aurora (PostgreSQL), Replicas, choosing between consistency/eventual consistency wherever needed, adding caching layers to most used parts of the code. 

Impact: we were able to handle over 1.5x orders/second of projected load at the beginning of the project. Database peak load dropped ~30-40% supporting growth of the business. 

Decomposing front-end part of Rails monolith application ensuring faster build times, higher development efficiency, lower coupling, and reducing costs. 

Rails upgrade: Leading a team on Rails upgrade journey (Rails 4.2->Rails 5.2). With a fleeting time to Ruby 2.7 end-of-life 

CI/CD improvements: Reducing build/specs time for application by 10-15%. Impact: higher developer efficiency, faster fixes to prod. 

Technologies used: Ruby, Rails, Sidekiq, PostgreSQL, DynamoDB, Elasticache(Redis), ECS, AWS Lambda, Terraform, JS, React.js, Redux, Microservices.
I'm currently located in Poland so looking for position in this country.
Looking for a stable project where I can either lead a team or be an individual contributor or a promising start-up position.
I might also consider changing direction to other programming language where I can unleash my potential.