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Hi, I'm Izabela, an Elixir-focused backend developer with real-world experience building scalable, event-driven systems in production. I specialize in service-to-service communication, system monitoring, and performance optimization. Currently, I work on a backend team that develops a real-time social communication platform based on microservices architecture. I'm passionate about leveraging my Elixir expertise to build robust, scalable, real-time applications. I enjoy collaborating with cross-functional teams and helping clients with technical support and integrations, always aiming to maintain high code quality and system stability.…Hi, I'm Izabela, an Elixir-focused backend developer with real-world experience building scalable, event-driven systems in production. I specialize in service-to-service communication, system monitoring, and performance optimization. Currently, I work on a backend team that develops a real-time social communication platform based on microservices architecture. I'm passionate about leveraging my Elixir expertise to build robust, scalable, real-time applications. I enjoy collaborating with cross-functional teams and helping clients with technical support and integrations, always aiming to maintain high code quality and system stability.

Izabela Cieślewicz-Rokosik

Back-End Developer, Developer, Programmer, +3

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Hi, I'm Izabela, an Elixir-focused backend developer with real-world experience building scalable, event-driven systems in production. I specialize in service-to-service communication, system monitoring, and performance optimization. Currently, I work on a backend team that develops a real-time social communication platform based on microservices architecture. I'm passionate about leveraging my Elixir expertise to build robust, scalable, real-time applications. I enjoy collaborating with cross-functional teams and helping clients with technical support and integrations, always aiming to maintain high code quality and system stability.…Hi, I'm Izabela, an Elixir-focused backend developer with real-world experience building scalable, event-driven systems in production. I specialize in service-to-service communication, system monitoring, and performance optimization. Currently, I work on a backend team that develops a real-time social communication platform based on microservices architecture. I'm passionate about leveraging my Elixir expertise to build robust, scalable, real-time applications. I enjoy collaborating with cross-functional teams and helping clients with technical support and integrations, always aiming to maintain high code quality and system stability.

Available to hire

Hi, I’m Izabela, an Elixir-focused backend developer with real-world experience building scalable, event-driven systems in production. I specialize in service-to-service communication, system monitoring, and performance optimization. Currently, I work on a backend team that develops a real-time social communication platform based on microservices architecture.

I’m passionate about leveraging my Elixir expertise to build robust, scalable, real-time applications. I enjoy collaborating with cross-functional teams and helping clients with technical support and integrations, always aiming to maintain high code quality and system stability.

Skills

Experience Level

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

Polish

Fluent

English

Advanced

Spanish; Castilian

Beginner

Work Experience

Backend Developer at Appunite

January 1, 2024 - Present

Built and maintained a scalable real-time messaging system with Elixir/Phoenix serving over 173,000 monthly active users. Maintained and enhanced authentication and authorization mechanisms integrating Firebase, Google APIs, APNs, ReCaptcha, and SMS providers. Improved event-driven processing and notification systems using Kafka and Redis. Developed advanced spam detection and rate limiting methods, optimized data management with PostgreSQL and Ecto. Managed efficient service-to-service communication with Protocol Buffers. Upgraded dependencies to ensure system stability and security, conducted unit and integration testing, refactored legacy code, led peer reviews, and maintained deployment workflows with GitLab CI/CD. Managed infrastructure with AWS and Kubernetes, created automated balance monitoring systems with alerting, and supported English-speaking clients in technical debugging and integration. Worked collaboratively using Jira and Confluence.

Backend Developer at Appunite

January 1, 2024 - Present

Built and maintained a scalable real-time messaging system serving over 173K monthly active users using Elixir and Phoenix. Maintained and enhanced authentication and authorization mechanisms integrating Firebase, Google APIs, APNs, ReCaptcha, and SMS providers. Improved event-driven processing and notification systems with Kafka and Redis. Developed advanced spam detection and rate limiting mechanisms. Managed data with PostgreSQL and Ecto, optimizing performance and crafting complex queries. Built efficient service-to-service communication using Protocol Buffers. Upgraded Elixir, Erlang, and dependencies to ensure stability and security. Wrote unit and integration tests, refactored legacy code, led peer reviews, and maintained GitLab CI/CD deployment workflows. Managed infrastructure with AWS and Kubernetes, including behavioral analytics using Amazon QuickSight. Created automated balance monitoring with alerts for integration failures or low funds. Provided technical support and cli

Backend Developer at Appunite

January 1, 2024 - Present

Built and maintained a scalable real-time messaging system serving over 173K monthly active users using Elixir/Phoenix. Maintained and enhanced authentication and authorization mechanisms, integrating with Firebase, Google APIs, APNs, ReCaptcha, and SMS providers. Improved event-driven processing and notification systems using Kafka and Redis. Developed advanced spam detection and rate limiting mechanisms with Redis and Hammer Backend. Managed data with PostgreSQL and Ecto, including performance optimization and complex queries. Built efficient service-to-service communication with Protocol Buffers. Upgraded Elixir, Erlang, and dependencies for stability and security. Wrote unit and integration tests; refactored legacy code. Led peer reviews and technical discussions to maintain code quality. Maintained deployment workflows with GitLab CI/CD and managed infrastructure with AWS and Kubernetes. Created automated balance monitoring with alerting for integration failures. Provided technica

Backend Developer at Appunite

January 1, 2024 - Present

Built and maintained a scalable real-time messaging system serving over 173K monthly active users using Elixir/Phoenix. Enhanced authentication and authorization by integrating Firebase, Google APIs, APNs, ReCaptcha, and SMS providers. Improved event-driven processing and notification systems with Kafka and Redis. Developed advanced spam detection and rate limiting mechanisms using Redis and Hammer Backend. Managed PostgreSQL data using Ecto with performance optimization and complex queries. Built efficient service-to-service communication using Protocol Buffers. Upgraded Elixir, Erlang, and third-party dependencies to ensure system stability and security. Maintained deployment workflows with GitLab CI/CD, managed AWS infrastructure including behavioral analytics with Amazon QuickSight and Kubernetes. Developed automated balance monitoring systems with alerting for integration failures or low funds. Provided technical support and debugged bugs in direct communication with English-speak

Backend Developer at Appunite

January 1, 2024 - Present

Built and maintained a scalable real-time messaging system serving over 173K monthly active users using Elixir and Phoenix. Maintained and enhanced authentication and authorization mechanisms with integrations including Firebase, Google APIs, APNs, ReCaptcha, and SMS providers. Improved event-driven processing and notification systems with Kafka and Redis. Developed spam detection and rate limiting mechanisms using Redis and Hammer Backend. Managed data with PostgreSQL and Ecto, optimizing performance and handling complex queries. Established efficient service-to-service communication using Protocol Buffers. Upgraded Elixir, Erlang, and third-party dependencies to ensure system stability and security. Wrote unit and integration tests, refactored legacy code, and led peer reviews. Managed deployment workflows with GitLab CI/CD, infrastructure using AWS (including behavioral analytics in Amazon QuickSight) and Kubernetes. Created automated balance monitoring with alerting for integration

Notary Trainee at Notary Office

July 31, 2023 - July 12, 2025

Prepared notarial deeds and performed direct customer service via email and phone.

Notary Trainee at Notary Office

July 31, 2023 - July 12, 2025

Prepared notarial deeds and managed direct customer service via email and phone.

Notary Trainee at Notary Office

July 31, 2023 - July 12, 2025

Performed preparation of notarial deeds and activities while providing direct customer service via email and phone.

Notary Trainee at Notary Office

July 31, 2023 - July 12, 2025

Prepared notarial deeds and conducted direct customer service via email and phone communication.

Notary Trainee at Notary Office

July 31, 2023 - July 12, 2025

Prepared notarial deeds and directly serviced customers via email and phone.

Education

Master of Law at Faculty of Law and Administration, Adam Mickiewicz University, Poznań

January 1, 2011 - December 31, 2016

Master of Law at Faculty of Law and Administration, Adam Mickiewicz University, Poznań

January 1, 2011 - December 31, 2016

Master of Law at Faculty of Law and Administration, Adam Mickiewicz University, Poznań

January 1, 2011 - December 31, 2016

Master of Law at Faculty of Law and Administration, Adam Mickiewicz University, Poznań

January 1, 2011 - December 31, 2016

Master of Law at Faculty of Law and Administration, Adam Mickiewicz University, Poznań

January 1, 2011 - December 31, 2016