Jedrzej Manicki

Senior Elixir Developer

GigSmart

Oct 2024 - Oct 2025 (1 year 1 month)

Poland-based developer with proven success working remotely for US companies across multiple time zones, demonstrating flexibility and strong communication in distributed environments.Collaborated closely with stakeholders, CTO, and COO to design and implement new features supporting compliance with evolving U.S. W-2 regulations.Enhanced payments and timesheet workflows, improving reliability, accuracy, and overall user experience within the app.

Senior Elixir Developer

Diffco

Oct 2023 - Oct 2024 (1 year 1 month)

As a Senior Elixir Developer, I was responsible for building robust backend systems for an enterprise upskilling platform, focusing on developing calendar scheduling and mailer services to automate meeting coordination. I implemented a nudges and reminders system to enhance user engagement and streamline review processes. Additionally, my role required a comprehensive understanding of software engineering principles, which included not only back-end development using Elixir but also occasional involvement in front-end tasks, ensuring a seamless integration between the two. This holistic approach allowed me to contribute effectively to the overall functionality and user experience of the platform.

Senior Software Engineer, API & DX

Boulevard

Mar 2022 - May 2023 (1 year 3 months)

Contributed to a platform serving appointment-based self-care businesses with a focus on API architecture and integrations.Optimized scheduling using Google OR-Tools (CP-SAT) for intelligent appointment matching.Led API and developer experience initiatives, defining requirements, improving observability, and implementing rationale-based rate limiting.Built and maintained integrations with Shopify and Zapier to extend client automation and commerce workflows.Collaborated with data teams to modernize reporting infrastructure.

Elixir developer

AppUnite

Jun 2016 - Jan 2022 (5 years 8 months)

As an Elixir Developer, I led backend development for multiple Elixir-based platforms across logistics, e-commerce, and social domains. I successfully migrated a legacy Rails app to Elixir and redesigned databases from MongoDB to PostgreSQL to enhance performance and scalability. My role involved architecting features such as fleet access control, route-based pricing algorithms, and asynchronous web crawlers. I integrated secure payment systems, including Apple in-app purchases and custom fund-freezing flows, while also building large-scale analytics pipelines. I delivered production-ready MVPs and platform integrations within distributed ecosystems, advocating for functional design patterns and backend scalability best practices. Additiona

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