Grzegorz is available for hire
Hire GrzegorzGrzegorz Pawlik
Verified Expert in Engineering
Full-stack Software Engineer and Developer
Sopot, Poland
Toptal member since January 26, 2021
Bio
Grzegorz is a highly skilled full-stack software engineer with 17 years of experience in leading teams, technical screening, and creating a high-trust culture. They consistently deliver high-quality results on time and within budget, specializing in complex apps with extensive business logic. Grzegorz oversaw the MVP chat feature at Toptal and led Stripe API integrations and employee benefits automation in the OysterHR startup. Previously they worked with eSky and Nexway.
Portfolio
FilialHealth
Ruby on Rails (RoR), ViewComponent, Stimulus, Hotwire, Tailwind CSS, PostgreSQL...
Oyster
Ruby on Rails (RoR), Ruby, RSpec, React, Capybara, Heroku, GitHub, TypeScript...
Toptal
Code Review, Git, Management, Cucumber, RSpec, Ruby on Rails (RoR), Ruby, Scrum...
Experience
- Web Development - 13 years
- JavaScript - 13 years
- Code Review - 13 years
- Agile Deployment - 13 years
- Ruby - 10 years
- PostgreSQL - 7 years
- Ruby on Rails (RoR) - 6 years
- RSpec - 6 years
Work Experience
Senior Developer
2024 - PRESENT
FilialHealth
- Extracted reusable view components, migrated layout logic from JavaScript to CSS container queries, and reframed utility-class helpers into a higher-level design-system API. Picked up across the codebase by every front-end contributor.
- Improved and maintained the development seed data — kept it realistic and current as the domain evolved, so every engineer's local environment mirrors production scenarios. Foundational for onboarding, manual QA, and screenshot-driven UI work.
- Introduced a foundational medical-codes domain model integrated with the scheduling system, with type-aware defaults. The model remains central to product flows shipped years later.
- Reshaped account-scoped routing across the app — renamed the public identifier, simplified validation, migrated profile URLs to tenant-scoped paths, and fixed post-authentication redirect logic that fell out of the change.
- Introduced contextual error reporting — capturing per-request state on exceptions — early in the application's life. The foundation of later observability work builds on.
- Enabled branch coverage, stabilized flaky tests, made retry behavior deterministic, and consistently shipped coverage improvements alongside feature work. Lifted CI reliability for the whole team.
- Led a reliability initiative on a healthcare SaaS platform: distributed tracing on third-party clients, structured error context, retry semantics for transient failures, and standardized HTTP timeouts. Reduced MTTR and silent failures.
- Replaced legacy HTTP Basic Auth on internal admin surfaces with a centralized superadmin authorization gate. Rebuilt the user-permissions admin UI and removed leakage of internal enum mappings from the service layer.
- Drove a multi-step deprecation of a legacy column underpinning a core domain model. Staged across sequential PRs with backfills and read-path migrations, designed for safe rollback at every step.
- Designed and shipped a multi-PR redesign of the clinical documentation editor — new/edit flows, save-state UX, dirty-form protection, browser navigation guards, URL state. Owned end-to-end from spec through rollout.
Technologies: Ruby on Rails (RoR), ViewComponent, Stimulus, Hotwire, Tailwind CSS, PostgreSQL, Datadog, Faraday, Multi-tenant SaaS, Incident Response, Authorization, Synthetic Data Generation, Claude, Claude Code, Artificial Intelligence (AI), PDF, Large Language Models (LLMs), AI Automation, Zapier, REST APIs, OAuth, Workflow Automation & System Integration, Email Automation, APIs, OpenAI, Full-stack Development, User Interface (UI), Email
Senior/Staff Engineer
2021 - 2024
Oyster
- Implemented payment system integration (Stripe) ACH/SEPA/BACS.
- Tracked and fixed bugs using the Sentry exception reporting tool.
- Architected and developed an employee benefits automation system.
- Managed tools like Sentry, Heroku, and GitHub Actions.
- Contributed to detecting and fixing security vulnerabilities.
- Improved CI and CD pipelines and fixed flaky tests.
Technologies: Ruby on Rails (RoR), Ruby, RSpec, React, Capybara, Heroku, GitHub, TypeScript, Stripe API, DocuSign, Sentry, Technical Hiring, Redis, Linux, API Integration, Zapier, REST APIs, OAuth, Workflow Automation & System Integration, Email Automation, Google Sheets, APIs, Amazon Web Services (AWS), Google Cloud Platform (GCP), Node.js, Full-stack Development, User Interface (UI), Email
Team Lead and Engineering Manager
2019 - 2020
Toptal
- Led a successful implementation and delivery of a dedicated chat solution, actively worked with stakeholders to manage features, and delivered on time.
- Onboarded and integrated new team members into the team.
- Oversaw an established team through a successful domain switch; the team delivered value in the first six months.
Technologies: Code Review, Git, Management, Cucumber, RSpec, Ruby on Rails (RoR), Ruby, Scrum, PostgreSQL, Full-stack, Technical Hiring, Redis, Linux, API Integration, REST APIs, OAuth, Workflow Automation & System Integration, APIs, Google Cloud Platform (GCP), Node.js, Email
Senior Software Engineer
2016 - 2019
Toptal
- Reduced the time to introduce a new vertical by a factor of 12.
- Improved internal spec performance by a factor of 5 (includes reviewing and coaching other teams on the best practices).
- Introduced a fast-performing, hybrid (static files and DB entries) translation solution.
- Mentored new team members joining the team, helping them in their first month.
- Introduced improvements to the dev's internal toolbox.
Technologies: Memory Profiling, Profiling, Static Analysis, Code Review, Scrum, Cucumber, RSpec, Git, Ruby on Rails (RoR), Ruby, PostgreSQL, Full-stack, Redis, Linux, API Integration, REST APIs, OAuth, APIs, Node.js, Full-stack Development, User Interface (UI), Email
Team Leader, Scrum Master, and Developer
2013 - 2016
Nexway
- Stabilized the team output from chaotic (approximately 10% of the features were rejected by the QA) to very stable (99.48 features accepted in the QA stage).
- Introduced QA processes into the team (peer reviews, peer testing, hostile peer testing).
- Led and coached the team on the testing, which increased the code stability and developer's confidence in the codebase.
Technologies: Code Review, Git, Integration Testing, Unit Testing, Testing, Scrum, MySQL, Magento, PHP, Technical Hiring, Linux, API Integration, REST APIs, Email Automation, APIs, Node.js, Full-stack Development, User Interface (UI), Email
Developer and Team Lead
2007 - 2011
NetArch Interactive Agency
- Introduced source code version control, allowing the company to get to the next level.
- Delivered multiple dedicated web system solutions successfully.
- Designed multiple systems, including architecture and database structure.
Technologies: Code Review, Git, Ajax, jQuery, JavaScript, CakePHP, MySQL, Apache, PHP, Linux, API Integration, APIs, Full-stack Development, User Interface (UI), Email
Project History
Embedded Chat App
https://portal.toptal.com/The chat app allows communication between Toptal's clients and talent. Clients can send messages from their portal, and talent can respond via Slack.
I led the team responsible for the 1st MVP version, which was delivered and deployed within three months. It was initially enabled for selected clients and then handed over to another team that enabled it 100%.
I led the team responsible for the 1st MVP version, which was delivered and deployed within three months. It was initially enabled for selected clients and then handed over to another team that enabled it 100%.
Employee Benefits System
https://oysterhr.com/total-rewardsA system managing benefits for employees worldwide, supporting multiple—manual and automated—benefits providers. The system includes various benefits (health, pension, dental, allowance) and integration with payroll and invoicing subsystems.
Direct Debit (Stripe) Integration
https://oysterhr.com/Implemented a payment solution for international clients by directly charging them for provided services (Direct Debit: ACH, SEPA, Bacs, BECS). I delivered an extensible and well-delineated interface that has been the foundation for collections at Oyster for the last three years (as of 2024).
Education
2007 - 2009
Master's Degree in Project Management
Wyższa Szkoła Zarządzania i Biznesu - Kraków, Poland
2003 - 2006
Bachelor's Degree in Computer Science
Uniwersytet Opolski - Opole, Poland
Certifications
FEBRUARY 2014 - FEBRUARY 2020
Magento Certified Developer
Magento
Skills
Libraries/APIs
REST APIs, React, Node.js, Slack API, Twilio API, jQuery, Stripe API
Tools
Git, RSpec, Cucumber, Claude Code, Apache, GitHub, Sentry, Hotwire, Claude, Zapier, Google Sheets
Languages
Ruby, JavaScript, PHP, Assembler, C++, TypeScript
Frameworks
Ruby on Rails (RoR), CakePHP, Capybara, Ruby on Rails 6, Stimulus, Tailwind CSS
Paradigms
Scrum, Testing, Unit Testing, Management, Test-driven Development (TDD), Synthetic Data Generation
Platforms
Linux, Magento, Amazon Web Services (AWS), Google Cloud Platform (GCP), Magento 1, Heroku
Storage
MySQL, PostgreSQL, Redis, EventStore, Datadog
Industry Expertise
Banking & Finance, Accounting
Other
Web Development, Code Review, Integration Testing, Agile Deployment, Full-stack, API Integration, Email Automation, APIs, Full-stack Development, Algorithms, Static Analysis, Profiling, Memory Profiling, Technical Hiring, Ajax, PDF, OAuth, Workflow Automation & System Integration, User Interface (UI), Email, State Machines, Turing Machines, Computer Graphics, Law, Economics, WebSockets, Performance Testing, DocuSign, Events, ViewComponent, Faraday, Multi-tenant SaaS, Incident Response, Authorization, Artificial Intelligence (AI), Large Language Models (LLMs), AI Automation, OpenAI
Collaboration That Works
How to Work with Toptal
Toptal matches you directly with global industry experts from our network in hours—not weeks or months.
1
Share your needs
Discuss your requirements and refine your scope in a call with a Toptal domain expert.
2
Choose your talent
Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.
3
Start your risk-free talent trial
Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.
Top talent is in high demand.
Start hiring