Mid Ruby on Rails Developer

🏢 Summary: Python Developer role focused on designing scalable, high-performance backend web applications with FastAPI. The position includes database design, API and authentication implementation, automated testing, performance optimization, and collaboration on new product features. 🗂️ Requirements: 3+ years of Python development experience, Strong knowledge of FastAPI, Django, or Flask, Relational database design experience, REST API and WebSocket implementation, SQLAlchemy or Django ORM experience, Database schema design, optimization, and maintenance, JWT, cookie-based, or OAuth authentication implementation, CI/CD pipeline familiarity, Docker and Docker Compose experience, Design patterns and SOLID principles, Automated testing proficiency, Code review commitment, English proficiency — B2+, Polish proficiency — C1+ 📃 Skills: Python, FastAPI, Django, Flask, PostgreSQL, REST, WebSockets, SQLAlchemy, JWT, OAuth, GitHub, GitLab, Docker, SOLID, Testing 🏢 Description: About Momentum: At Momentum, we accelerate digital innovation in healthcare. Our mission is to empower HealthTech startups and scaleups by transforming ideas into cutting-edge digital products. We combine deep industry expertise, strategic consulting, and full-stack development to create solutions that drive growth, compliance, and patient impact. We believe in technology that makes healthcare more accessible, efficient, and human-centered. Role overview: Do you love writing clean, efficient Python code and solving complex problems? Join our team and help us build scalable, high-performance applications! We’re looking for a Python Developer who is passionate about backend development and has experience with commonly used frameworks such as FastAPI or Django, this role is for you! You'll have the chance to influence architectural decisions, optimize performance, and collaborate with a talented team of engineers and product experts. If you're a proactive problem solver who thrives in a dynamic environment, we'd love to hear from you! Requirements: Experience in Python (3+ years development experience) Strong knowledge of at least one framework: FastAPI (preferred), Django or Flask. Solid understanding of relational databases design (e.g. PostgreSQL) Ability to implement various ways of communication with client (e.g. REST API, WebSockets) Hands-on experience with Object-Relational Mappers (SQLAlchemy or Django ORM), including designing, optimizing and maintaining database schemas Ability to implement various ways of authentication (e.g. JWT, cookie-based auth, OAuth) Familiarity with CI/CD pipelines (GitHub Actions, GitLab CI or similar) and experience with containerization tools (Docker, Docker Compose). Practical knowledge of design patterns and SOLID principles Proficiency in testing Love for code review Fluent written and spoken English (B2+) Fluent written and spoken Polish (C1+) Nice to have: Practical knowledge of non-relational DBs, cache and message brokers systems Knowledge of Unix systems and shell Experience with Web Server (e.g. Nginx) Knowledge of asynchronous programming in Python (asyncio, async/await) and familiarity with task queues or background job frameworks (e.g. Celery) Familiarity with cloud environments (AWS, GCP or Azure) and basic skills in working with their services Experience in healthtech projects, familiarity with the specific challenges of the industry, such as data privacy regulations (e.g. HIPAA, GDPR in a medical context) or integration with health data standards (e.g. HL7, FHIR), is a big plus Responsibilities: Design and build web applications using Python (FastAPI) Design and implement relational databases Collaborate with cross-functional teams to define, design, and ship new features Write automated tests for your code including edge cases, usability, and general reliability Work on bug fixing and improving performance Continuously discover, evaluate, and implement new technologies What We Value: Clarity in focus and dedication to building digital products that elevate healthcare and improve quality of life. Flair to face challenges with boldness, creativity, and a proactive mindset. Grit to take ownership, stay ambitious, and deliver refined, high-quality solutions. Impact through meaningful innovation that makes pioneering medical discoveries accessible and human-centered. Ability to collaborate efficiently in teams of technical and non-technical individuals, and comfortable working in a dynamic environment with evolving objectives and iteration with users. What we offer: Team Building & Development Fun(d): We believe in the power of fun and development, and microfunds are here to bring some excitement into your work-life or you can access them to develop your skills and gain knowledge. Modern Workspace: We provide a modern and comfortable office environment, right in the heart of Wrocław. Work-Life Harmony: Enjoy flexible working hours , allowing you to find the perfect balance between work and life. Stay Active: Our company Multisport benefit encourages you to stay fit and take care of your well-being. Your Health Matters: Access to private healthcare ensures you're taken care of when you need it most. Remote Support: For our remote team members we offer reimbursement for necessary and the non-necessary office visits. Freedom of choice: We understand that we all have different lifestyles and needs, that's why the Worksmile Cafeteria System gives you access to hundreds of non-wage benefits to choose from. Security and peace of mind: We provide the option to join our comprehensive insurance plan, for your and your loved one’s security. If you have any questions, get in touch with us!

🏢 Summary: Join the engineering team as a Mid/Senior Ruby Developer to build, maintain, and scale modern Ruby on Rails web applications. The role focuses on delivering clean, reliable code, automating browser testing with Selenium WebDriver, and collaborating on scalable technical solutions. 🗂️ Requirements: Commercial Ruby experience, Ruby on Rails experience, Selenium WebDriver experience, Object-oriented programming knowledge, Relational database knowledge, RESTful API knowledge, Git proficiency 📃 Skills: Ruby, Rails, Selenium, WebDriver, PostgreSQL, MySQL, REST, Git, RSpec, Docker, GitHub, Actions, JavaScript, HTML, CSS 🏢 Description: We are looking for a Mid/Senior Ruby Developer to join our engineering team. In this role, you will be responsible for developing, maintaining, and scaling modern web applications using Ruby on Rails . You will work closely with cross-functional teams to deliver high-quality, clean code, while ensuring robust system stability and test coverage through automated testing tools like Selenium WebDriver . Essential functions Design, build, and maintain efficient, reusable, and reliable Ruby/Ruby on Rails code. Develop new features and optimize existing application workflows. Integrate test automation practices using Selenium WebDriver to ensure high code quality and reliability. Collaborate with team members to translate business requirements into scalable technical solutions. Participate in code reviews, technical discussions, and knowledge-sharing sessions. Qualifications Solid commercial experience with Ruby and Ruby on Rails (v6+ preferred). Practical experience with Selenium WebDriver for automated testing and browser automation. Strong understanding of object-oriented programming, relational databases (e.g., PostgreSQL/MySQL), and RESTful APIs. Familiarity with Git and modern software development workflows. Active Listening: Ability to truly understand requirements, feedback, and team discussions. Effective Teamwork: Strong collaborative mindset and open communication. Knowledge Exchange: Eagerness to share expertise, mentor peers, and learn from others. Would be a plus Experience with automated testing tools, CI/CD pipelines, and containerization (e.g., RSpec, Docker, GitHub Actions). Familiarity with frontend technologies (JavaScript, HTML/CSS) and RESTful API integration. We offer Opportunity to work on bleeding-edge projects Work with a highly motivated and dedicated team Competitive salary Flexible schedule Benefits package - medical insurance, sports Corporate social events Professional development opportunities Well-equipped office About us Grid Dynamics (NASDAQ: GDYN) is a leading provider of technology consulting, platform and product engineering, AI, and advanced analytics services. Fusing technical vision with business acumen, we solve the most pressing technical challenges and enable positive business outcomes for enterprise companies undergoing business transformation. A key differentiator for Grid Dynamics is our 8 years of experience and leadership in enterprise AI , supported by profound expertise and ongoing investment in data , analytics , cloud & DevOps , application modernization and customer experience . Founded in 2006, Grid Dynamics is headquartered in Silicon Valley with offices across the Americas, Europe, and India.

🏢 Summary: Senior frontend/full-stack developer role focused on building resilient, enterprise-ready product features for a sports and health platform. The position involves React, TypeScript, Next.js, REST APIs, PostgreSQL, and close remote collaboration, with a hybrid schedule in Kraków. 🗂️ Requirements: 5+ years of professional development experience, Production experience with React and TypeScript, Production experience with Next.js App Router, REST API and data-validation experience, PostgreSQL and ORM experience, Ability to follow architectural documentation and team conventions, Git, code review, and Jira experience, Independent problem analysis and written feature planning/ADRs, Careful handling of healthcare data, schemas, and access logic, Strong written technical communication, Remote and asynchronous collaboration skills, Advanced English, Ability to complete a technical coding test without assistance, Availability to start within one month, Ability to work from the Kraków office 3 days per week 📃 Skills: React, TypeScript, Next.js, REST, Zod, PostgreSQL, Drizzle, Prisma, TypeORM, Git, Jira, Claude 🏢 Description: About the role You will be assisting in the understanding of, architecture, implementation, and quality of core Product Roadmap items intended to drive the project for our client forward. The ability to work with the team and collaborate is essential. You will have an immediate impact and be an early figure in the company today to help drive our growth. You will focus on solidifying our product and making it resilient as well as learning how to roll out enterprise-ready features. Required skills /knowledge and production experience/ React + TypeScript Next.js (App Router) — routing, server/client components, API routes REST API, data validation (example - Zod) PostgreSQL and ORM (Drizzle or similar — Prisma/TypeORM) Work according to the team's conventions and architectural documentation(ADR-y) — the ability to read and follow established standards before writing code Git, code review, ticketing (Jira) Coding with Claude /on daily basis/ Minimum of 5 years of professional experience developer with hands-on skills. Communication and other required skills Git, code review, ticketing (Jira) Independence in problem analysis and a willingness to plan before implementation (the project requires a written plan/ADR before each new feature). Accuracy and attention to detail—working with healthcare data requires caution when changing the schema and access logic. Good written communication—documentation, PR descriptions, tickets, and code review comments. Comfortable working in a distributed/remote team and asynchronous communication. Openness to feedback and a willingness to propose simpler solutions instead of over-engineering (the project explicitly avoids over-engineering). Sense of responsibility (ownership) for the delivered functionalities from design to implementation. Advanced English - hard must - daily calls with native CTO or CEO(weekly) . Ability to discuss technical problems, describe concept, architecture or planned feature. There's going to be (online or onsite in Krakow) technical coding test (without extra help) and English general and/or tech conversation. Awesome but not a must: Supabase (Auth, RLS, Postgres) AWS: S3, SQS, Lambda - designing or integrating with data processing pipelines (multipart upload, task queuing, workers) Terraform / IaC - ability to read infrastructure definitions (no need to write them yourself) Working with video / media data / large-volume files (e.g., recording processing, LiDAR, wearable data) Designing permission systems (RBAC) for multiple user roles OpenAPI / API contracts, documenting endpoints Experience in health, sports, telemedicine, or other sensitive/regulated data Application observability (Sentry, PostHog, or similar) Real-time integrations (chat/video SDKs like CometChat, WebSocket) Our benefits: Awesome and highly intense product /sports and health/ Private medical care and multisport card Flexible working hours (you can start between 8:00 -10:00 a.m.) Your choice of computer: Mac OS/Linux/Windows Upskilling budget English discussion classes every week Parking spot few mins from office Employee recommendation program. 🟢 The office is based in Kraków. We work 3 days from the office a week. 🟢 The process consists of 2 stages. We recruit remotely :) Ideal candidate should start within a month (no longer).

🏢 Summary: Opportunity for an experienced software professional to design and build complex systems from scratch, define project-wide technical solutions, and establish strong development practices. The offer includes flexible hours, remote-work options, competitive compensation, and a structured career-development system. 🗂️ Requirements: 3+ years of IT experience, Ruby on Rails experience, SQL or NoSQL database experience, Understanding of Unix-like systems, English for technical project discussions 📃 Skills: Ruby, Rails, SQL, NoSQL, Unix, HTML5, JavaScript, TypeScript, Angular, React, AWS, GoogleCloud, CICD, Scrum 🏢 Description: We are looking for experienced professionals who can design and develop complex software systems from scratch, design project-wide technical solutions, as well as establish and control the best development practices. What we expect from you: 3+ years of experience in IT; experience with Ruby on Rails; experience with databases (SQL or NoSQL); good understanding of *nix systems; English skills should be sufficient for taking part in conversations on the technical aspects of projects. It would be a plus to have: experience with Frontend development (HTML 5, JavaScript / TypeScript, Angular / React, etc.); hands-on experience with cloud services (AWS, Google Cloud); experience in setting up and supporting development processes (CI/CD, code review, static code analysis, automated testing); experience working with SCRUM; experience in creating technical documentation. We offer: Projects for such clients as PayPal, Wargaming, Xerox, Philips, Adidas and Toyota; Competitive compensation that depends on your qualification and skills; Career development system with clear skill qualifications; Flexible working hours aligned to your schedule; Options to work remotely.