Jobs Backend

Want to work on technologies used by data platforms at a global scale?

We’re looking for Senior and Middle+ Java Engineers to join a long-term cloud data infrastructure project focused on modern Data Lakehouse technologies, distributed systems, and open-source development.

You’ll be building integrations between data processing frameworks and cloud services, improving compatibility across the ecosystem, and contributing to technologies that power large-scale analytics platforms. If you enjoy solving complex backend challenges and working close to the open-source community, this role is for you.

What you’ll be working on

• Develop new features for large-scale data infrastructure components.
• Build integrations between distributed data processing frameworks and cloud storage services.
• Improve compatibility across modern data processing engines.
• Contribute to high-quality, production-grade backend services.
• Participate in architecture discussions and technical design.
• Collaborate with engineers across international teams and contribute to engineering best practices.

Tech stack

Must have

• Java
• Python (working proficiency)
• Experience with at least one of: Apache Flink, Spark, Kafka, or Apache Beam
• Understanding of Data Lake / Lakehouse architecture

• Experience with Google Cloud Platform (BigLake, GCS, KMS, or related services)

   

Nice to have

• Apache Iceberg
• Open Source contributions
• Experience with distributed systems
• Cross-system integration experience

What we’re looking for

• Strong commercial experience with Java backend development.
• Experience building data-intensive or distributed backend systems.
• Solid understanding of cloud-native architectures.
• Experience working with modern data processing technologies.
• Strong problem-solving skills and ownership mindset.
• Good communication skills and ability to work in a distributed international team.

What we offer

• Paid vacation and sick leave
• 11 official public holidays per year
• Personal Career Development Plan (CDP)
• Challenging engineering projects with modern cloud technologies
• Paid external training, conferences, and professional certifications
• Internal tech talks, workshops, and English classes
• Employee support program (healthcare, legal assistance, partner discounts)
• Corporate library with paper and e-books

If you’re excited about distributed systems, cloud data platforms, and building software that makes an impact beyond a single product, let’s talk!

Apply now or send us a message – we’d love to share more details about the project and see if it’s the right fit for you.

🚀 Project Description

From the engineering side, this role is focused on Backend + Infrastructure / DevOps as secondary skillset, with strong ownership over the technical foundation of the features.
 

✅ You are:
 

• Have practical experience from commercial projects, pet projects, hackathons, or open-source contributions
• Confident with Java, with readiness to work close to ML workloads and model-serving pipelines
• Comfortable building backend services and REST APIs
• Understand System design, asynchronous processing, and service integration
• Have experience with Docker and deploying services in cloud environments
• Understand how to build and maintain CI/CD pipelines
• Have hands-on experience with AWS or similar cloud platforms
• Are comfortable working with PostgreSQL
• Understand logging, monitoring, environment setup, and deployment workflows
   

➕ Will be a plus:
 

• Experience with MLOps or model-serving infrastructure
• Experience deploying ML models for inference on CPU
• Familiarity with Python, FastAPI, Spring Boot, or similar backend frameworks
• Experience with AWS services or similar
• Understanding of job queues, background workers, and long-running processing workflows
• Familiarity with infrastructure-as-code tools such as Terraform or similar
• Comfortable working with AI platforms and developer tools such as Cursor, Claude Code, or Codex
   

♟️ What We Expect from You:
 

• Use modern AI tools, frameworks, and approaches to work faster and more effectively
• Make practical decisions that help us launch faster without unnecessary overengineering
• Proactively identify bottlenecks, propose solutions, and help shape technical decisions
• Be comfortable working in an evolving product with changing priorities and early-stage ambiguity
   

🔑 Responsibilities:
 

• Implement and enhance backend services 
• Actively collaborate with the team lead and team
• Maintain the initial cloud environment for development, testing, and production
• Build and support processing pipelines for model execution and result delivery
• Configure logging, monitoring, and basic operational observability
• Ensure the system is reliable, maintainable, and easy to extend
• Utilize AI to review pull requests and contribute to engineering best practices
   

🍩 What we offer:
 

• Opportunity to work on an innovative product in the medical-tech domain
• High ownership and direct impact on product architecture
• Flexible work hours within the European time zone
• A fast-moving environment where strong engineers can influence product and technical decisions
• Paid 200$+ AI assistants and modern engineering tooling
• Professional development support, latest courses and certifications
• 20 business days of vacation
• 5 sick leave days
• National holidays covered
   

🗣 Recruitment process:
 

✔️ Technical Task → ☑️ AI Live Coding Task → ✅ Cultural-Fit Interview → 🏁 Offer

We at Sigma Software are looking for a Senior Java Engineer to join an exciting project in the domain of audience segmentation and engagement. This is a remote role open to candidates from Ukraine and Europe, offering the opportunity to work with cutting-edge technologies and high-scale systems.

You will be part of a team building a real-time platform that powers communications, personalization, automation, and customer engagement across diverse ecosystems. At Sigma Software, we value innovation, collaboration, and technical excellence.

Why join us? You’ll work on challenging tasks, contribute to architectural decisions, and have the freedom to experiment with new technologies while improving data systems at scale.
 

Customer

Our customer is a leading EdTech company that uses AI and data-driven technologies to personalize learning experiences, optimize user engagement, and improve marketing effectiveness through advanced audience targeting and analytics.
 

Project

The project is a real-time platform that enables product teams and business stakeholders to define and manage dynamic user groups based on user attributes, relationships, behavioral events, and historical activity.

Responsibilities

• Design and implement core components of the audience segmentation platform
• Develop and evolve a flexible segment definition language supporting complex targeting scenarios
• Build scalable evaluation engines for processing large-scale entity and relationship data
• Implement relationship-based audience resolution across multiple entity types
• Optimize incremental recomputation for continuous data changes
• Create event-driven pipelines for real-time segment accuracy
• Ensure governance, auditability, and lifecycle traceability of segments
• Design low-latency resolution services for high-scale operations
• Develop caching strategies for dynamic segments and snapshots
• Optimize system performance, scalability, and operational efficiency
• Collaborate with product and engineering teams to define platform capabilities and architecture
• Provide technical leadership and contribute to architectural decisions

Requirements

• At least 5+ years of backend engineering experience
• Strong Java expertise
• Proven experience building distributed systems
• Knowledge of query engines, search platforms, rules engines, segmentation platforms, or analytics systems
• Strong understanding of data modeling and domain-driven design principles
• Experience with event-driven architectures
• Skilled in designing scalable APIs and backend services
• Strong problem-solving and performance optimization skills
• Experience with cloud-native architectures
• Ability to drive technical decisions and contribute to system architecture
• Upper-Intermediate+ English level
   

Will be a plus

• Experience with recommendation engines
• Knowledge of Quarkus
• Experience building Customer Data Platforms (CDP)
• Experience with marketing automation systems
• Expertise in audience segmentation or personalization platforms
• Familiarity with graph-based data models and relationship traversal
• Experience with search technologies (Elasticsearch, OpenSearch)
• Experience with stream processing technologies
• Experience with Google Cloud Platform
• Experience with large-scale analytics systems

Join a project where scalability, resiliency, and real-time communication are at the core of the engineering challenge. We are looking for a Senior Java Developer to help build a high-load multi-channel communications platform used to deliver critical notifications to millions of users worldwide.

As part of Sigma Software, you will work remotely in an international engineering environment and contribute to the development of distributed, event-driven systems with complex delivery pipelines and fault-tolerant architecture.

We at Sigma Software offer the opportunity to influence architectural decisions, work on long-term product development, and collaborate with experienced engineering teams building modern cloud-native solutions.

Customer

Our customer is a leading EdTech company that uses AI and data-driven technologies to personalize learning experiences, optimize user engagement, and improve marketing effectiveness through advanced audience targeting and analytics.

Project

The project focuses on building a modern multi-channel communications platform capable of delivering critical notifications across email, SMS, voice, and push channels at massive scale. The system supports automated workflows, emergency broadcasts, consent management, reporting and analytics, provider failover strategies, and real-time event processing.

Responsibilities

• Design and implement a scalable event-driven communications platform
• Build highly reliable and fault-tolerant message delivery systems
• Manage large-scale real-time event processing pipelines
• Design and implement multi-channel delivery pipelines across email, SMS, voice, and push channels
• Handle compliance requirements, consent management, and communication policies
• Support emergency and high-priority notification workflows
• Implement provider failover and resiliency strategies to ensure delivery continuity
• Build tracking systems for delivery status, retries, and engagement events
• Design and implement observability, reporting, and analytics infrastructure
• Develop event processing and message orchestration workflows
• Implement provider integrations and external messaging service adapters
• Ensure system scalability, throughput, and performance under high load
• Collaborate with product and engineering teams on communication flows and requirements
• Contribute to architectural decisions and long-term platform evolution
• Ensure operational stability, reliability, and maintainability of the system

Requirements

• At least 5 years of  software development experience
• Strong expertise in Java development
• Experience with distributed systems
• Strong experience with event-driven architectures
• Experience with messaging systems, queues, streams, and brokers
• Experience designing high-scale APIs and backend services
• Strong understanding of system reliability and fault tolerance

• Upper-Intermediate English level

   

Will be a plus:

• Experience with email or SMS delivery systems
• Experience with telecom or messaging infrastructure
• Experience with marketing automation platforms
• Experience with notification or engagement systems
• Experience with workflow engines
• Experience with compliance-heavy systems, including consent and GDPR-like regulations
• Experience with high-throughput event processing systems
• Experience with cloud-native platforms, preferably GCP

Want to work on technologies used by data platforms at a global scale?

We're looking for Senior and Middle+ Java Engineers to join a long-term cloud data infrastructure project focused on modern Data Lakehouse technologies, distributed systems, and open-source development.

You'll be building integrations between data processing frameworks and cloud services, improving compatibility across the ecosystem, and contributing to technologies that power large-scale analytics platforms. If you enjoy solving complex backend challenges and working close to the open-source community, this role is for you.

What you'll be working on

• Develop new features for large-scale data infrastructure components.
• Build integrations between distributed data processing frameworks and cloud storage services.
• Improve compatibility across modern data processing engines.
• Contribute to high-quality, production-grade backend services.
• Participate in architecture discussions and technical design.
• Collaborate with engineers across international teams and contribute to engineering best practices.

Tech stack

Must have

• Java
• Python (working proficiency)
• Experience with at least one of: Apache Flink, Spark, Kafka, or Apache Beam
• Understanding of Data Lake / Lakehouse architecture
• Experience with Google Cloud Platform (BigLake, GCS, KMS, or related services)

Nice to have

• Apache Iceberg
• Open Source contributions
• Experience with distributed systems
• Cross-system integration experience

What we're looking for

• Strong commercial experience with Java backend development.
• Experience building data-intensive or distributed backend systems.
• Solid understanding of cloud-native architectures.
• Experience working with modern data processing technologies.
• Strong problem-solving skills and ownership mindset.
• Good communication skills and ability to work in a distributed international team.

Working conditions

• 🌍 Remote
• 🌎 Collaboration with US-based engineering teams
• ⏰ Daily overlap by 10:00 AM PST
• 📅 Long-term project
• Flexible working schedule (8-hour workday)

What we offer

• Paid vacation and sick leave
• 11 official public holidays per year
• Personal Career Development Plan (CDP)
• Challenging engineering projects with modern cloud technologies
• Paid external training, conferences, and professional certifications
• Internal tech talks, workshops, and English classes
• Employee support program (healthcare, legal assistance, partner discounts)
• Corporate library with paper and e-books

If you're excited about distributed systems, cloud data platforms, and building software that makes an impact beyond a single product, let's talk!

Apply now or send us a message - we'd love to share more details about the project and see if it's the right fit for you.

RedCore is an international business group that creates technological solutions for digital markets. Our products and services cover fintech, marketing, e-commerce, customer service, communications, and regulatory technologies.

We are looking for a Senior Go Engineers! 

Requirements:

• 4+ years of experience with Go programming language.
• Proven ability to design and implement scalable and reliable software solutions.
• Strong understanding of event-driven architecture.
• Experience with containerization and orchestration tools like Docker and Kubernetes.
• Hands-on experience with RDBMS and/or NoSQL databases.
• Strong understanding of event-driven architecture + hands-on experience with Event Brokers.
• Experience with observability — implementing logs, metrics, and tracing.
• Proficiency in working with cloud platforms such as Google Cloud Platform (GCP) and/or AWS.
• Proficient in using Git, GitLab, and GitLab CI for source control and continuous integration.
• Excellent problem-solving abilities.
• Strong time management and organizational skills to handle multiple tasks effectively.
• Upper-intermediate level of English, both written and verbal.
   

Nice to have:

• Familiarity with the Twelve-Factor App methodology.
• Knowledge of Cloud Events and GitOps practices.
   

Responsibilities:

• Develop high-performance, testable, and maintainable code to deliver new functionality.
• Conduct code reviews to ensure quality, maintain standards, and share knowledge across the team.
• Integrate industry-leading third-party services into the platform.
• Mentor team members and actively share knowledge to foster growth and collaboration.
• Propose and implement innovative technical initiatives to improve systems and processes.
   

Why Join Us:

• Flexible remote or hybrid working format based on your location.
• No Time Trackers: We value trust and focus on results.
• Career growth, professional development, and regular performance reviews.
   

Hiring Steps: HR Interview > Technical Interview (no test task, no live-coding needed) > Reference check > Offer
 

Our benefits to you:
☘️An exciting and challenging job in a fast-growing business group, the opportunity to be part of a multicultural team of top professionals in Development, Architecture, Management, Operations, Marketing, Legal, Finance and more

🤝🏻Great working atmosphere with passionate experts and leaders, sharing a friendly culture and a success-driven mindset is guaranteed

🧑🏻‍💻Modern corporate equipment based on macOS or Windows and additional equipment are provided

🏖Paid vacations, sick leave, personal events days, days off

💵Referral program — enjoy cooperation with your colleagues and get the bonus

📚Educational programs: regular internal training sessions, compensation for external education, attendance of specialized global conferences

🎯Rewards program for mentoring and coaching colleagues

🗣Free internal English courses

✈️In-house Travel Service

🦄Multiple internal activities: online platform for employees with quests, gamification, presents and news, clubs for movie / book / pets lovers and more

🎳Other benefits could be added based on your location 
 

About the Role

We are expanding our team and looking for a PHP Developer to join our RnD department. You will work on developing and maintaining internal products, including CRM systems, CMS, marketing tools, and backend services that support multiple business units.
This is an excellent opportunity to work on high-load systems, modern microservice architecture, and large-scale data processing while collaborating with experienced engineers across multiple teams.

Who We Are

Our RnD department is a key driver of innovation in the company, consisting of multiple teams that develop CRM systems, marketing tools, CMS, payment solutions, and internal platforms. We focus on automation, scalability, and performance, building systems that support business growth across multiple products and regions.

Why Join Us?

• You'll work on high-load backend systems that process large volumes of data.
• You'll participate in designing new services and improving existing architecture.
• We use modern technologies, microservices, queues, and cloud infrastructure.
• You'll collaborate closely with architects, DevOps engineers, frontend developers, QA engineers, PMs, and Business Analysts.
• We encourage knowledge sharing, code reviews, and continuous technical improvement.
• You'll have opportunities for professional growth while working on complex engineering challenges.

Requirements
 

Must-Have:

• 2+ years of commercial experience with PHP 7+.
• Strong knowledge of MySQL and PostgreSQL.
• Experience developing REST APIs.
• Experience working with queue systems such as Redis, Beanstalkd, RabbitMQ, or similar.
• Experience with Gitlab/Github.
• Understanding of OOP principles, SOLID, and common design patterns.

Nice-to-Have:

• Commercial experience with Phalcon/Spiral.
• Experience with Kafka or other event streaming platforms.
• Experience with Docker and containerized environments.
• Basic knowledge of Kubernetes.
• Experience working with Elasticsearch or MongoDB.
• Understanding of microservice architecture.
• Experience with CI/CD pipelines.
• Experience working with high-load applications.
• Experience configuring web servers (Nginx).

Responsibilities

• Develop and maintain backend applications and microservices.
• Design, develop, and support REST APIs.
• Work with large datasets and optimize application performance.
• Refactor and improve existing codebase.
• Integrate internal and third-party services.
• Participate in architecture discussions and technical planning.
• Collaborate closely with frontend developers, QA engineers, DevOps, architects, and PMs.
• Participate in code reviews and follow established development standards.

Benefits

• 18 business days of paid vacation + public holidays compensation.
• Insurance Fund of the company.
• Partial coverage of professional courses.
• Coverage of sick leaves, sports activities, and English language courses.

Description:
The project is an AI platform for marketing, it connects marketing professionals, data, tools and AI in a single place. It is the simplest, safest and fastest way to realize the benefits of scaled AI – delivering better-informed creative ideas faster, at scale and at lower cost.
We’re endlessly curious and our team of thinkers, builders, creators and problem solvers are over 2,000 strong, across 20 markets around the world.

We are seeking a talented and experienced Backend Engineer to join our engineering team. You will be instrumental in designing, developing, and maintaining the robust and scalable backend systems that power our cutting-edge marketing technologies, including the AI platform. If you have a passion for building high-performance APIs, working with large datasets, and contributing to the future of AdTech, we want to hear from you.

Requirements

• 4+ years of professional experience in backend software development.
• Strong proficiency in Python
• Extensive experience designing and building RESTful APIs.
• Solid understanding of database systems.
• Experience with cloud platforms GCP and developing cloud-native applications.
• Familiarity with containerization technologies (Docker).
• Knowledge of message queues/event streaming platforms (e.g., Kafka, RabbitMQ, SQS/SNS) is highly desirable.
• Experience with microservices architecture and distributed system design.
• Proficiency with version control systems, particularly Git.
• Strong problem-solving skills, analytical thinking, and attention to detail.
• Excellent communication and collaboration skills to work effectively within cross-functional teams.

Job responsibilities

• Design and Develop Robust Backend Systems
• Design, develop, and implement high-performance, scalable, and resilient backend services and APIs (REST, gRPC) that support our various data products and AI platforms.
• Write clean, maintainable, and efficient code in Python using best practices and appropriate design patterns.
• Collaborate with architects and senior engineers to define system architecture, data models, and integration strategies.
• Integrate with internal and external data sources, AI/ML services, and third-party APIs relevant to the AdTech ecosystem.
• Ensure Scalability, Reliability, and Performance
• Optimize existing backend services for maximum speed, scalability, and stability, handling large volumes of data and traffic inherent in the AdTech domain.
• Implement robust monitoring, logging, and alerting solutions to proactively identify and address system issues.
• Participate in performance tuning, troubleshooting, and debugging of complex backend systems.
• Contribute to the continuous improvement of our deployment processes, CI/CD pipelines, and cloud infrastructure interactions.
• Uphold Code Quality and Best Practices
• Conduct thorough code reviews, ensuring adherence to coding standards, security best practices, and architectural guidelines.
• Develop comprehensive unit, integration, and end-to-end tests to guarantee the quality and reliability of backend components.
• Contribute to technical documentation, including API specifications, architectural diagrams, and system runbooks.
• Actively participate in the agile development process, including sprint planning, daily stand-ups, and retrospectives.

About us

The client is the first Customer-Led Marketing Platform. Its solutions ensure that marketing always starts with the customer instead of a campaign or product. It is powered by the combination of 1) rich historical, real-time, and predictive customer data, 2) AI-led multichannel journey orchestration, and 3) statistically credible multitouch attribution of every marketing action.

Requirements

• At least 3 (1 for junior position) years of experience with .NET.
• Solid experience in SQL (advanced skills in DML).
• Hands-on experience with OLAP storage (at least one of Snowflake, BigQuery, or ClickHouse).
• Hands-on experience with microservice architecture and distributed high-load systems.
• Solid knowledge of Design Patterns.
• Experience in automated test creation (TDD).

• Experience in working with AI tools.

   

Advantages

• Being fearless of mathematical algorithms (part of our team’s responsibility is developing ML models for data analysis; although knowledge of ML is not required for the current position, it would be awesome if a person felt some passion for algorithms).
• Experience in python would be a plus.
• Experience with GCP would be a plus.
• Familiarity with Docker and Kubernetes.
• Experience with Terraform would be a plus.

We are looking for a Middle .NET Developer to join our team and work on an exciting FinTech project. You'll collaborate with experienced engineers to build scalable, secure, and high-performance backend solutions.

Responsibilities:

• Develop and maintain backend services using C# and .NET.
• Design and implement RESTful APIs.
• Participate in architecture discussions and code reviews.
• Collaborate with cross-functional teams to deliver high-quality software.
• Write clean, maintainable, and well-tested code.
   

Requirements:

• 3+ years of commercial experience with C#/.NET.
• Strong knowledge of .NET Core / .NET 6+ and ASP.NET Core.
• Experience with REST APIs.
• Solid understanding of SQL databases (MS SQL Server or PostgreSQL).
• Experience with Entity Framework Core.
• Knowledge of OOP, SOLID principles, and design patterns.

Nice to Have:

• Docker and Kubernetes.
• Azure or AWS.
• Experience with microservices.
• Previous experience in the FinTech domain.

We Offer:

• Remote work and flexible working hours.
• Legal support.
• Paid sick leaves.
• Paid vacations.
• Medical insurance. 
• Free English classes.

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 Senior Full-stack .NET Engineer with Blazor to join our team. 

Our Client is a leading provider of automated storage and logistics systems. Together with N-iX and client engineers, you will work on developing a comprehensive, scalable, and efficient solution to meet the evolving needs of modern warehouse management, ensuring a robust, future-proof operational environment.

Responsibilities:

• Actively engaging in development meetings to stay abreast of new technologies and understand the company's vision and objectives.
• Playing a key role in technical planning meetings, collaborating with colleagues to discuss user stories and decompose tasks with the end result in mind.
• Ensuring the delivery of high-quality products through meticulous practices such as documentation, code reviews, unit tests, API tests, and comprehensive monitoring.
• Collaborating closely with the product manager to ensure the team's clear understanding of the project's purpose.
• Proactively escalating issues to the Head of Development when assistance is required.
• Aligning with the team's goals during daily stand-up meetings.
• Advocating for improvement suggestions during retrospective meetings that lead to positive changes.

Requirements:

• Strong proficiency in C#, .NET Core, and .NET Framework - 5+ years of experience
• Experience with the Blazor framework
• Solid understanding of Clean Code, DDD, and CQRS principles
• Practical knowledge of CI/CD pipelines
• Experience with PostgreSQL and SQLite
• Hands-on familiarity with Docker
• Knowledge of RabbitMQ and MassTransit
• Practical experience with gRPC
• Strong skills in Unit Testing and Integration Testing
• Proficiency with Git
• English level - Upper-intermediate+
• Polish level - Native/Advanced

Numerical Technologies LTD is a leading provider of custom software solutions and services specializing in risk, limits, and regulatory capital. Right now, we are looking for a Java Developer to join our team.

What you will be doing:

As part of the team, you will be participating in a project for a major US financial holding company.  You will develop, maintain, and support software features, write scalable and fault-tolerant Java code, debug applications, and integrate with internal and third-party services. You will collaborate with the product team to meet requirements and ensure code quality through testing, code reviews, and system design.

Project: Modernization of a monolithic system into a microservices architecture. Java services provide authentication, logging, and data management. Python services handle core computational logic.

What we’re looking for:

• 5+ years of experience in Java development, preferably in FinTech.
• Strong experience with Java and Spring Framework.
• Solid understanding of microservices architecture and design patterns.
• Proficient in SQL (Oracle, PostgreSQL).
• Experience with AWS.
• Python knowledge is a plus.
• Ability to test your own code to ensure quality.
• Capable of working autonomously and independently. 
• University diploma (Bachelor’s degree or above) required.
• Excellent communication and collaboration skills in an international environment.
• Upper-intermediate English level or higher.

What we offer:

• Competitive compensation depending on experience and skills.
• Regular assessments and salary reviews.
• Paid personal days.
• Mental health support program.
• Language classes.
• Flexible working schedule.

We're looking for a Junior AI-Native Full-Stack Python Developer who is passionate about software engineering and excited to build real products using modern AI tools.

Experience: 6+ months of commercial experience plus personal, freelance, university, or open-source projects that demonstrate your passion for software development.

At Flexipy, you'll build production software for international clients in SaaS, AI, and business automation. We're looking for developers who enjoy solving real problems, communicate well, and are ready to take responsibility for their work. You'll collaborate with experienced engineers while continuously expanding your technical and product expertise.

We believe modern software engineers should know how to collaborate with AI, not compete against it. Claude Code, Cursor, ChatGPT, and similar tools are part of our daily development workflow. We expect every developer to know how to use AI responsibly to accelerate development while maintaining high engineering standards.

Core Technical Skills:

• 6+ months of commercial experience plus personal, freelance, university, or open-source projects that demonstrate your passion for software development
• Good understanding of Python Core (OOP, clean code, basic async)
• Experience with Django or FastAPI
• Basic understanding of REST APIs and backend architecture
• Basic knowledge of PostgreSQL or other relational databases
• Basic knowledge of React and JavaScript/TypeScript
• Experience using Git and collaborative development workflows

AI Development Skills:

• Daily experience using AI-assisted development tools such as Claude, Claude Code, Cursor, ChatGPT, GitHub Copilot, or similar
• Ability to write clear, structured prompts for software engineering tasks
• Understanding of prompt engineering fundamentals and effective context management
• Experience using AI for code generation, debugging, refactoring, documentation, testing, and research
• Ability to review, validate, and improve AI-generated code instead of accepting it blindly
• Curiosity to explore new AI tools and incorporate them into daily development workflows

Communication & Professional Skills:

• English level: B2+ (written and spoken) — comfortable communicating directly with teammates and clients
• Good communication and collaboration skills
• Responsibility and ownership of assigned tasks
• Self-organization and attention to detail
• Strong problem-solving mindset
• Curiosity, continuous learning, and willingness to grow professionally
• Ability to receive feedback and continuously improve

What You'll Do:

• Build backend features using Django or FastAPI
• Contribute to real client projects in SaaS, AI, and business automation
• Build and maintain REST APIs
• Fix bugs and implement new features
• Support frontend development using React
• Work with PostgreSQL and integrate third-party APIs when needed
• Write clean, maintainable, and well-documented code
• Use AI tools such as Claude Code, Cursor, and ChatGPT as part of your daily development workflow
• Participate in code reviews, daily syncs, technical discussions, and occasional client meetings
• Continuously improve your technical, product, and AI development skills

Nice to Have:

• Docker and Docker Compose
• Celery and Redis
• Basic CI/CD knowledge
• Experience with OpenAI, Anthropic, or other LLM APIs
• Testing fundamentals (Pytest, frontend testing)
• AWS, DigitalOcean, or other cloud platforms
• Active GitHub profile or open-source contributions

What We Value:

• Responsibility and ownership
• Honest and open communication
• Curiosity and continuous learning
• Attention to detail
• Teamwork and collaboration
• Product mindset
• Long-term commitment and professional growth

What We Offer

• Fully remote work
• Flexible working hours (start between 8:00–10:00)
• Work on modern international SaaS, AI, and automation products
• Mentorship from experienced engineers
• Daily use of modern AI development tools and workflows
• No micromanagement or screen monitoring
• Daily team syncs and weekly planning
• Friendly and collaborative engineering culture
• Learning budget after successful probation (courses, books, certifications)

Compensation:

$500–800/month, depending on your technical assessment, experience, communication skills, and interview results.

Career Growth:

We believe in growing engineers—not just filling positions.

We conduct a performance and salary review after approximately 6 months, focusing on your technical growth, ownership, communication, and overall contribution to the team.

Our goal is to provide a clear and transparent career path:

Junior Full-Stack Developer

⬇️ After consistently demonstrating technical growth, responsibility, and strong performance

Junior+ Full-Stack Developer

⬇️ After taking ownership of more complex features, working independently, and contributing to technical decisions

Middle Full-Stack Developer

Career growth at Flexipy is based on your impact, technical skills, communication, ownership, and continuous improvement—not simply the amount of time you've spent in the role.

Ready to Apply?

If you're passionate about Python, AI, and modern software development—and want to build real products while growing alongside experienced engineers—we'd love to hear from you.

Please include:

• Your CV or LinkedIn profile
• GitHub profile (if available)
• A few words about projects you've worked on (commercial, freelance, university, or personal)
• A short note describing how you use AI tools (Claude, Cursor, ChatGPT, Claude Code, etc.) in your daily development workflow
• Your English level and availability

IMPAX is looking for a WordPress Developer for long-term remote collaboration across several active projects.
Your responsibilities will include building and improving websites, fixing issues, configuring environments, and customizing themes and plugins to meet project needs.
 

Requirements

• 3+ years of commercial experience with WordPress development.
• Strong knowledge of HTML5, CSS3, SCSS, and responsive web development.
• Experience with Tailwind CSS for building modern UI components.
• Solid understanding of JavaScript (ES6+).
• Strong PHP skills and understanding of OOP principles.
• Experience working with SQL/MySQL databases.
• Hands-on experience with WooCommerce development and customization.
• Experience creating custom WordPress themes from scratch.
• Experience developing and maintaining custom WordPress plugins.
• Proficiency with Gutenberg Blocks development (custom blocks).
• Experience with Elementor and Beaver Builder.
• Familiarity with npm, Webpack, and modern front-end build tools.
• Experience integrating third-party REST APIs and external services.
• Understanding of WordPress coding standards, security, and performance optimization.
• Experience using AI-powered development tools such as Claude and Cursor to improve productivity.
• Familiarity with Git and collaborative development workflows.
• Good debugging, problem-solving, and communication skills.

• Intermediate or higher level of English.

   

Key Responsibilities

• Develop, maintain, and optimize WordPress websites and web applications.
• Build custom WordPress themes and plugins according to project requirements.
• Develop and customize WooCommerce stores and functionality.
• Create reusable and maintainable Gutenberg Blocks.
• Customize websites built with Elementor and Beaver Builder.
• Convert Figma or design mockups into responsive, pixel-perfect websites.
• Develop front-end components using HTML, SCSS, Tailwind CSS, and JavaScript.
• Build and maintain efficient asset pipelines using npm and Webpack.
• Integrate third-party APIs, payment gateways, and external services.
• Optimize website performance, Core Web Vitals, SEO readiness, and accessibility.
• Troubleshoot bugs and provide ongoing maintenance for existing projects.
• Collaborate with designers, SEO specialists, QA engineers, and project managers.
   

What IMPAX Offers

• Steady flow of tasks and ongoing projects.
• Flexible schedule and fully remote work.
• Clear technical requirements, defined priorities, and fast feedback.
• Opportunities for growth — from front-end development to complex architectural integrations.
• A chance to become a lead WordPress developer within IMPAX.