Jobs Ruby

Who We Are

PAR Retail, with its Open Commerce® product suite and patent pending Wallet Steering® System, empowers Convenience & Fuel Retailers to gain more share of wallet and customer lifetime value than possible with any other solution provider. PAR Retail’s unified Open Commerce product suite consists of: Activate for Intelligent 1:1 Loyalty, Transact for Contactless Commerce, and Experience for Cross-Channel Customer Experiences. PAR Retail’s solutions are supported by a set of subscription-based program management services and are contractually backed by its 1.5X Performance Guarantee.

Technology Stack:

Ruby, Ruby on Rails, Postgres, Redis, Sidekiq, GraphQl, RabbitMQ

Requirements:

- Practical experience building systems in Ruby on Rails

- At least 6 years industry experience or equivalent

- Experience building and maintaining backend APIs, including design, implementation, evolution, and maintenance

- Familiarity with TypeScript, or similar modern strongly-typed language

- Proficiency using a variety of database technologies, both relational and non-relational

- Strong understanding and familiarity with CI/CD pipelines and automated tests

- An ability to work in service-based architectures as well as well-factored Rails monolith applications

- Highly independent and able to effectively self-organize and prioritize work

- The ability to write clean code, and the discipline to write effective automated tests to deliver high-quality system improvements

- An ability to effectively break down larger bodies of work for delivery as a series of small, self-contained changes to the system

- Excellent spoken and written communication skills

- BS/MS degree in Computer Science, Engineering, or equivalent years of professional working experience

Bonus Points

- Experience with NodeJS and React

- Experience in the retail and/or fuel & convenience industries

- Experience working in distributed teams

- Experience with Nest.js and/or GraphQL

Responsibilities:

- Collaborate closely with other Engineers, design and implement new functionality based on product objectives and requirements.

- Work with the broader product engineering team to plan and coordinate feature and functionality improvements, as well as resolve bugs and execute technical enhancements, that cross-cut large parts of our platform.

- Work to continually learn, improve technology skills, expand knowledge of the our platform technologies, and gain increasing versatility across the breadth of our platform systems.

- Expand APIs and business logic, and as needed write or revise customer-facing API documentation.

- Work with our infrastructure team to enable and enhance highly-available, performant, and well-instrumented backend applications and services that run in our customer environments at substantial scale.

- Support operations and infrastructure teams for issue resolution on relevant applications or services running in production environments.

PAR Retail Offers:

- Long-term employment;

- Competitive compensation with regular performance-based salary and career development reviews;

- Paid vacations and sick leaves;

- Flexible working hours;

- A unique and friendly environment where everyone can explore and learn new technologies.

We are looking for a Full Stack Engineer to join our team at ORIL. This is an opportunity to work on a sophisticated PropTech / MarTech platform that is currently reshaping how the real estate industry handles data. If you enjoy a high-tempo environment, love working with AI, and want to see your code make a direct impact on business decisions, this is for you.
 

About the Project

Our client is a US-based innovator providing a centralized data platform for multi-family real estate. The product uses BI and AI analytics to help operators optimize marketing spend and operational efficiency.
 

Tech Stack: Ruby on Rails, React, PostgreSQL, AI/LLM integrations, AWS.
 

What are we looking for?

• 3+ years of experience in Full Stack development using Ruby on Rails and React;
• Proactive Delivery: You are comfortable with a fast development pace. You don’t wait for detailed instructions on every edge case—you think ahead and deliver ready-to-use features;
• Technical Independence: You can take a high-level requirement and turn it into a working feature (from DB schema to UI) without constant supervision;
• Problem-Solving: You focus on making things work efficiently and aren’t afraid to dig into complex data or scraping logic;
• Communication: Ability to discuss technical solutions directly with the team and the client;
• English level: Upper-Intermediate (B2).
   

Nice to have:

• Experience in PropTech or fast-growing SaaS startups;
• Experience with web scraping or complex data ingestion;
• Familiarity with AI/LLM integrations (OpenAI API, etc.).
   

What will you do?

• Develop and maintain features across the full stack (RoR + React);
• Build and optimize integrations with external property management and marketing tools;
• Work on the AI assistant’s backend logic and its UI representation;
• Help the team maintain a high tempo while keeping the code clean and scalable;
• Collaborate with the Lead dev and PM to refine the technical roadmap.
   

We offer:

• Competitive compensation;
• Flexibility to work from anywhere (fully remotely or in our office in Lviv);
• Accounting Support Services;
• Education budget + corporate education events/trainings;
• Compensation for certifications, fitness, or therapy sessions;
• A dynamic environment where your proactivity is recognized and rewarded.
   

Application Process:

1. Initial Screening: Call with Recruiter.
2. Technical Interview.
3. Client Interview.
    

Ready to build the future of Real Estate AI? Apply now and let’s get to work!

About the Project

AI Interview Platform (client name undisclosed) — a leading technical interviewing platform used by fast-growing startups and large enterprises worldwide. It pairs experienced engineers with standardized interview frameworks to enable fair, high-signal, and scalable hiring for software engineers globally.

What You'll Do

• Conduct live technical interviews with software engineering candidates worldwide via the platform.
• Assess coding skills, problem-solving abilities, technical knowledge, and communication while creating a professional and inclusive candidate experience.
• Provide structured, objective feedback based on established evaluation criteria to reduce bias and improve hiring quality.
• Collaborate with the client’s team to test, refine, and improve interview content, processes, and platform features.
•  

Must Have

• 4+ years of professional experience as a Software Engineer/Developer.
• Strong Ruby / Ruby on Rails proficiency
• Working knowledge of frontend technologies (JavaScript, React, or similar).
• Solid understanding of algorithms, data structures, and software engineering fundamentals.
• Excellent English communication skills (spoken and written).

• Professional demeanor, ability to deliver objective assessments, and reliable setup (webcam, microphone, stable internet).

   

Nice to Have

• Prior experience conducting technical interviews (DS&A, system design).
• Mentoring, coaching, or technical leadership experience.
• Interest in talent assessment, interviewing best practices, or inclusive hiring.
   

Location: EU / Remote (Ukraine)

Type: Freelance full-time (first 3 months), with option to go part-time later.

About Us

At UITOP, we design and develop scalable B2B SaaS platforms across industries like logistics, finance, construction, and so on.

Job Summary
The role focuses on backend development, building and optimizing systems, and integrating AI features to enhance the platform. The position also requires familiarity with DevOps practices to support deployment, monitoring, and scalable operations.

What do you have

• At least 4 years of experience with Ruby on Rails, with 3–4 years of professional backend development.
• Strong backend skills in Ruby and Rails (most important).
• Frontend experience with Vanilla JavaScript, Hotwire, StimulusJS, Turbo, TailwindCSS.
• Knowledge of data stores: Postgres, Redis; background job processing with Sidekiq; object storage with S3.
• Experience with cloud environments (AWS, GCP, or Azure), Terraform, networking, and security concepts.
• DevOps skills: CI/CD pipeline setup and maintenance, automated deployments, containerization (Docker), orchestration (Kubernetes), monitoring and logging, and performance optimization for production workloads.
• Good English communication skills (B2 level), ready to collaborate effectively in English.

About project
The platform helps cities, developers, and urban planners automate and simplify the permit approval process, reducing errors and speeding up approvals with AI.

What we have

• Regular performance and salary reviews. 
• Working with complex large-scale SaaS projects, from 6 months.
• 18 working days of vacation and 10 sick days.
• Compensation 50% for professional development cources. 
• Free Internal English classes.
• Company equipment. We’ll provide a laptop after 6 months of work. 
• Financial compensation of coworking 100% (during blackouts).
• Flexible work schedule, remote.

Our focus is on a result-oriented person, ready to learn and implement new technologies. Maybe you are our match, let's talk!

About Us

At UITOP, we design and develop scalable B2B SaaS platforms across industries like logistics, finance, construction, and so on.

Job Summary
We are looking for a Ruby on Rails Developer. The role focuses on backend development, and the team has been actively developing AI-powered features, making AI a core part of the product. You'll join a team of 5 developers, a PM, a designer, and 2 QA engineers.

What do you have

• At least 2 years of experience with Rails. 
• Proficient in Backend: you have at least two years of experience with Ruby and Ruby on Rails (most important), ideally 2-4 years.
• Frontend: Vanilla JavaScript, Hotwire with StimulusJS & Turbo a bit.
• Knowledge of Data Stores: Postgres and Redis; Sidekiq; S3. 
• Experience with Stimulus, TailwindCSS. 
• Experience with cloud environments, Terraform, networking and security concepts is a big plus. 
• Good English communication skills (B2 level), be ready to communicate effectively in English.

About project
The product helps municipalities and construction companies streamline the process of obtaining construction permits and approvals with AI. 

What we have

• Regular performance and salary reviews. 
• Working with complex large-scale SaaS projects, from 6 months.
• 18 working days of vacation and 10 sick days.
• Compensation 50% for professional development cources. 
• Free Internal English classes.
• Company equipment. We’ll provide a laptop after 6 months of work. 
• Financial compensation of coworking 100% (during blackouts).
• Flexible work schedule, remote.

Our focus is on a result-oriented person, ready to learn and implement new technologies. Maybe you are our match, let's talk!

Requirements:

At least 2-3 years experience programming in Ruby on Rails

Modern Ruby (3+), modern rails (7+)

Practical experience with RDBMS (preferably PostgreSQL)

Experience implementing APIs

Loves working in an Agile environment, Jira

Experience with source control tools — Git, Github

Experience with UNIX/Linux command line

Ability to solve problems using best practices and principles

Working closely with front-end developers

Will be a plus:

Third-party APIs integrations

TDD

DDD

Knowledge of server management (deployment, monitoring, optimizing, etc.)

Experience working in micro service architecture projects

Experience with Sidekiq

Experience with Elasticsearch

Knowledge of design patterns, basic algorithms and data structures

We offer:

Interesting project and challenging tasks

Professional & career growth

Vacation and sick leaves

Responsibilities:

Work closely together with business, design and other stakeholders of project

Write robust manageable code

Work in an agile team, participation in planning sprints, daily meetings, retrospectives, code reviews

Write unit and integration tests, bugs fixing and provide continuous integration

Use JIRA bug-tracking system, Time Tracker

Suggest ideas to improve work

Be a self-motivated and result oriented team player

About us:

Health24 is a medical information service for cloud storage, online processing and secure real-time sharing of medical information for healthcare workers and patients.

More details here — health24.ua

Who we are:

Adaptiq is a technology hub specializing in building, scaling, and supporting R&D teams for high-end, fast-growing product companies in a wide range of industries.

About the Product:

Our client operates a cloud-based platform dedicated to corporate ground transportation management, addressing a multi-billion-dollar market. The solution aggregates multiple transportation providers—such as corporate fleets, ride-hailing services, taxi operators, and limousine networks—into a unified system that helps businesses streamline operations and reduce spend. It serves a significant share of the largest companies worldwide and handles high volumes of transactions and data across diverse geographies. The platform’s core challenges include integrating heterogeneous external services, maintaining reliability under high-load conditions, implementing advanced business logic for scheduling and pooling, and providing accurate cost control and reporting. Strong backend engineering is critical to scaling global coverage, ensuring performance, and delivering a seamless user experience.

About the Role:

You will join a cross-functional development team responsible for core backend services that directly impact end users. The role offers full ownership of feature delivery—from reviewing product requirements and defining technical designs alongside architects and product managers, through to coding, testing, deployment, and monitoring in production. You will serve as first-line support for your services, proactively identify and address reliability and performance issues, and collaborate with other teams to ensure end-to-end system integrity. This position demands technical leadership, a hands-on approach to system architecture, and the ability to influence both engineering and product decisions. You will work remotely with periodic team gatherings and receive the tools and environment needed to deliver tangible business impact in a fast-paced, agile setting.

Key Responsibilities:

• Lead end-to-end development of backend microservices, including design, implementation, deployment, and production monitoring.

• Translate product requirements into scalable technical designs, data models, and RESTful APIs.

• Integrate with external transportation providers and internal systems to enable reliable, real-time workflows.

• Analyze and optimize system performance and database queries under high-load scenarios.

• Propose and implement architectural improvements to enhance resilience, scalability, and maintainability.

• Maintain and refactor existing services to improve code quality, test coverage, and observability.

• Collaborate with cross-functional teams and mentor peers on best practices in coding, testing, and operations.

• Participate in agile ceremonies, including backlog grooming and sprint planning, to align deliverables with business priorities.

Required Competence and Skills:

• 5+ years of backend software development experience in languages such as Go or Ruby.

• Proven experience designing and implementing data-driven applications using relational databases (e.g., PostgreSQL) and NoSQL stores (e.g., Redis).

• Solid understanding of RESTful API design principles and the HTTP protocol.

• Hands-on experience with Agile/Scrum methodologies and iterative delivery.

• Proficiency in writing unit tests and applying automated testing practices.

• Strong English communication skills, both verbal and written.

• Ability to understand complex business domains and translate needs into optimal technical solutions.

• Deep understanding of system architecture, high-load applications, and concurrency principles.

Nice to Have:

• Expertise in performance tuning of relational databases.

• Familiarity with gRPC and Protocol Buffers.

• Prior work on high-load, distributed systems.

• Background in building concurrent applications.

Why Us:

We provide 20 days of vacation leave per calendar year (plus official national holidays of a country you are based in).

We provide full accounting and legal support in all countries we operate.

We utilize a fully remote work model with a powerful workstation and co-working space in case you need it.

We offer a highly competitive package with yearly performance and compensation reviews.

Who we are:

Adaptiq is a technology hub specializing in building, scaling, and supporting R&D teams for high-end, fast-growing product companies in a wide range of industries.

About the Product:

Our client operates a cloud-based platform dedicated to corporate ground transportation management, addressing a multi-billion-dollar market. The solution aggregates multiple transportation providers—such as corporate fleets, ride-hailing services, taxi operators, and limousine networks—into a unified system that helps businesses streamline operations and reduce spend. It serves a significant share of the largest companies worldwide and handles high volumes of transactions and data across diverse geographies. The platform’s core challenges include integrating heterogeneous external services, maintaining reliability under high-load conditions, implementing advanced business logic for scheduling and pooling, and providing accurate cost control and reporting. Strong backend engineering is critical to scaling global coverage, ensuring performance, and delivering a seamless user experience.

About the Role:

You will join a cross-functional development team responsible for core backend services that directly impact end users. The role offers full ownership of feature delivery—from reviewing product requirements and defining technical designs alongside architects and product managers, through to coding, testing, deployment, and monitoring in production. You will serve as first-line support for your services, proactively identify and address reliability and performance issues, and collaborate with other teams to ensure end-to-end system integrity. This position demands technical leadership, a hands-on approach to system architecture, and the ability to influence both engineering and product decisions. You will work remotely with periodic team gatherings and receive the tools and environment needed to deliver tangible business impact in a fast-paced, agile setting.

Key Responsibilities:

• Lead end-to-end development of backend microservices, including design, implementation, deployment, and production monitoring.

• Translate product requirements into scalable technical designs, data models, and RESTful APIs.

• Integrate with external transportation providers and internal systems to enable reliable, real-time workflows.

• Analyze and optimize system performance and database queries under high-load scenarios.

• Propose and implement architectural improvements to enhance resilience, scalability, and maintainability.

• Maintain and refactor existing services to improve code quality, test coverage, and observability.

• Collaborate with cross-functional teams and mentor peers on best practices in coding, testing, and operations.

• Participate in agile ceremonies, including backlog grooming and sprint planning, to align deliverables with business priorities.

Required Competence and Skills:

• 5+ years of backend software development experience in languages such as Ruby or C++, Java, C#, Python, Node.js.

• Proven experience designing and implementing data-driven applications using relational databases (e.g., PostgreSQL) and NoSQL stores (e.g., Redis).

• Solid understanding of RESTful API design principles and the HTTP protocol.

• Hands-on experience with Agile/Scrum methodologies and iterative delivery.

• Proficiency in writing unit tests and applying automated testing practices.

• Strong English communication skills, both verbal and written.

• Ability to understand complex business domains and translate needs into optimal technical solutions.

• Deep understanding of system architecture, high-load applications, and concurrency principles.

Nice to Have:

• Professional experience developing in Golang.

• Expertise in performance tuning of relational databases.

• Familiarity with gRPC and Protocol Buffers.

• Prior work on high-load, distributed systems.

• Background in building concurrent applications.

Why Us:

- We provide 20 days of vacation leave per calendar year (plus official national holidays of a country you are based in).

- We provide full accounting and legal support in all countries we operate.

- We utilize a fully remote work model with a powerful workstation and co-working space in case you need it.

- We offer a highly competitive package with yearly performance and compensation reviews.

Cropwise Operations is a global leader in digital agritech solutions, operating in over 50 countries and helping optimize business processes and improve the efficiency of agronomic decision-making.  

We are looking for a skilled Ruby on Rails Developer to join our team.

What we expect from a candidate:

- Preferably 3+ years of Ruby on Rails development experience.

- Strong knowledge of Rails.

- Experience with testing frameworks like RSpec and Capybara.

- Testing with RSpec/Capybara.

- Basic knowledge of ES6 + React.js.

- Experience with JavaScript.

- Standard Rails application deployment stack (Git, CI, Capistrano, *nix).

- Knowledge of HTML/CSS.

What exactly will you need to work with:

- Backend on Ruby on Rails 7.0 (Ruby 3.2).

- PostgreSQL + PostGIS database (handling large geospatial datasets).

- Job processing with Resque + Redis.

- Testing on RSpec + Capybara + CI.

- Partially frontend on React.js (ES6, JSX).

What else can you work with?

- Algorithms for processing large amounts of geodata.

- Reception and processing of binary data (Ruby eventmachine).

- Working with RabbitMQ.

- AWS, Google Cloud, Kubernetes.

- Visualization and work with geodata on the frontend (Mapbox GL JS).

Hiring process:

- Intro call;

- Test Task;

- Final Interview;

- Offer.

The company offers:

- Opportunity to be a part of a best-in-class product that is used by thousands of companies around the world.

- Participation in complex technical tasks and challenges.

- Environment where you need to seek and implement unique engineering and technical solutions.

- Trainings and development programs.

- Flexible work formats: remote, office or hybrid.

- Health and life insurance for employees and your family members.

- 32 working days of paid annual leave and sick leave.

About Cropwise Operations

Cropwise Operations is a SaaS platform for farmers, leveraging cutting-edge technologies such as computer vision, big data, and AI to deliver actionable insights and improve agricultural outcomes.

For seekers, cooperation with Cropwise Operations is an opportunity to be part of a best-in-class product used by hundreds of companies around the world, and to deal with complex technical tasks in the field of neural networks and machine learning with the need to constantly improve their knowledge and skills, to find and implement unique engineering and technical solutions.

We're looking for a Senior with 8+ years of experience with a strong knowledge of both Ruby on Rails and Typescript.

Senior Ruby developer ASAP
(Please, send candidates only with the relevant skills specified in the white label CVs!)

FTE: Full time (40 h per week)
Timeline: 3-6 months (tbd)
Start: ASAP
English: B2
Recruitment process: a tech check with us, then an interview with the client

Requirements:
A Full-Stack Craftsman: You are an expert in Ruby on Rails and TypeScript, capable of building everything from complex dashboards and billing UIs to sleek documentation platforms.

The "DevEx" Champion: You have a natural empathy for other developers. You’ll develop deep knowledge of our platform (Pub/Sub, Chat, LiveSync) and use the product yourself to gain a first-hand understanding of the developer experience.

Comfortable with Ambiguity: You thrive in high-level vagueness. You can take a feature from a loose concept to a shipped product with minimal hand-holding, identifying problems and proposing solutions independently rather than waiting for a roadmap.

Accountable & Reliable: You take pride in high-quality, well-tested code. You meet your delivery commitments, provide realistic estimates based on technical complexity, and communicate proactively if a timeline is ever at risk.

An Owner: You monitor what you build in production and take personal ownership of quality issues. You see a feature through its entire lifecycle, from the first line of code to the final metric.

About the Project:

Glasses+ is a Ruby on Rails application for creating and publishing customized eyewear models. Users can build product variations based on a set of components (frames, temples, lenses, colors, etc.) and publish them to a WordPress-based online store.

Responsibilities

• Maintain and improve existing functionality, fix bugs
• Monitor the correct product publishing flow between the app and WordPress
• Develop new features according to client requirements

• Potentially participate in building Glasses Shop — a separate Ruby on Rails app for selling eyewear (as an alternative to WordPress)

   

Requirements

• 2+ years of commercial experience with Ruby / Ruby on Rails
• Experience working in a project cooperation model
• Basic understanding of Redis and its methods
• Experience with Sidekiq or understanding of how background jobs work
• Ability to work independently and deliver results

• English proficiency sufficient for reading technical documentation

   

Nice to have

• Basic familiarity with WooCommerce API (or willingness to explore the documentation as needed)

We offer

• Flexible part-time schedule
• Remote work
• Hourly rate 7-12 USD

• Friendly and supportive team

   

Please note: we use a time tracker.
 

🚀 Join our team!