Jobs Backend

We are seeking a passionate Full-Stack Software Engineer with extensive experience in PHP and JavaScript who loves engineering and the product development process. You will be responsible for developing new features, integrating systems, and optimizing and modernizing the existing codebase.

The ideal candidate has experience in:

- PHP 8.X, multiple frameworks and libraries;

- JavaScript from vanilla JS to React and TypeScript;

- HTML, CSS, SCSS, post-processing, scaffolding systems;

- relational databases, DB schema, and query optimization;

- Linux, Docker, CI/CD, Bash;

- software engineering principles, architecture patterns, application scalability, and low-latency system availability;

- experience with cloud platforms such as Azure;

- problem-solving skills;

- communication and collaboration skills.

You will be responsible for:

- develop, architect, and maintain SaaS applications using PHP and its frameworks;

- implement the frontend using JavaScript/TypeScript (from vanilla JS to modern libraries and frameworks), HTML, and SCSS;

- create and maintain RESTful APIs (SaaS and Proxy APIs);

- design and optimize database interactions (PostgreSQL, AWS DynamoDB);

- write clean, testable, efficient, and maintainable code;

- test and debug code to ensure the reliability and performance of applications;

- collaborate closely with founders and service teams to deeply understand our customers and users.

Seniority:

- university degree (non-course/academy; only technical university education);

- minimum of 6+ years of actual experience (non «freelance», no gaps, counting ONLY years after a university degree);

- your years in IT don’t guarantee your seniority;

- the slope of your learning is MORE important than your total years in IT, but don’t kid yourself;

- this job vacancy is not for newcomers/juniors/entry/majority-mid level, one framework developer, and ONLY for product development folks.

The position is ONLY for Ukrainian citizens. We don’t consider outsourcing, out-staffing, freelancing, or man-in-the-middle schemes, or part-time work; we only hire Core Team Members to the Core Team.

NuxGame is a dynamic IT company delivering top-tier software solutions for the iGaming industry. We empower operators of all sizes to expand into new markets, strengthen their existing brands, and achieve ambitious business goals.

We are looking for a Senior Backend Developer to join our team. If you are passionate about high-load systems, solving complex engineering challenges, and working with modern tech stacks, this is the place for you.

Tech Stack: PHP 8, Laravel, MySQL, ClickHouse, Redis, Docker, AWS, SQS, WebSockets, Sentry, NewRelic.

Your Responsibilities:

You will be responsible for the core logic of our platform, focusing on speed, scalability, and stability.

• Core Development: Design and maintain high-load services and platform modules using PHP 8 and Laravel.
• Architecture & Quality: Write reliable, well-tested code. Participate in architectural decision-making and ensure technical stability.
• Feature Ownership: Take full ownership of your features from coding to release. You will deploy to the dev environment and perform sanity checks to ensure functionality before handing tasks over to our dedicated QA team for deep testing.
• Performance: Optimize database queries, implement caching strategies, and manage async processes/queues.
• Integrations: Build complex integrations with external services (payment providers, game aggregators, analytics) via REST and WebSockets.
• Documentation: Maintain up-to-date technical documentation for APIs (Swagger/OpenAPI), services, and architectural decisions.
• Cross-Functional Collaboration: Partner with the DevOps team to optimize delivery pipelines and work alongside Product & Analytics teams to implement scalable data processing solutions.

• Testing: Create automated tests (unit, integration, feature) to ensure the quality and stability of your code.

   

What we expect from you:

• Experience: 4+ years of commercial experience as a PHP Backend Developer.
• Framework Expertise: Deep understanding of Laravel and its ecosystem.
• Database Skills: Strong knowledge of SQL (MySQL/PostgreSQL), query optimization, and working with large volumes of transactional/analytical data.
• API & Protocols: Experience with HTTP, REST, WebSockets, and complex API integrations.
• Async & Queues: Experience with message brokers (SQS, RabbitMQ, or similar).
• Infrastructure: Practical experience with Docker and Linux environment.

• Observability: Familiarity with logging, metrics, and tracing (Sentry, NewRelic, DataDog, ELK, etc.).

   

It will be a plus

• AI-Assisted Workflow: Experience with AI coding tools. We welcome a smart approach to AI to streamline complex tasks, from architectural design to documentation, development, and code refactoring.
• Leadership Experience: Experience in a technical leadership role (Tech/Team Lead, Mentor, Buddy) — sharing knowledge and guiding less experienced team members.
• Tech Breadth: Experience with Golang, Node.js, DDD (Domain-Driven Design).

• Analytics: Experience with analytical databases like ClickHouse.

   

What we offer

We believe that a happy team builds the best products. Here is how we support you:

• Remote & Flexible: Work from anywhere. Our core hours are 09:00/10:00 to 17:00/18:00 (Kyiv time), Mon-Fri.
• Financial Stability: Timely payment for compensation for services
• Personal Equipment Policy: No tech troubles — a MacBook and all necessary equipment are provided for use to ensure comfortable and efficient work.
• Learning & Development: It is a pleasure for us to watch you grow. We cover your learning costs (courses, conferences).
• Knowledge Sharing: We regularly gather to discuss new trends, share insights, and elevate one another.
• Community: At NuxGame, you will work in a team of like-minded people who are ready to support, inspire, and tackle complex challenges together.
• Creative Freedom: We encourage initiative. With us, you have the freedom of professional expression and the space to implement your ideas.
• Time-off Policy: 24 vacation days per year + 5 sick days (without medical confirmation).

• Atmosphere: A friendly environment focused on results and mutual respect, free from unnecessary bureaucracy and pressure.

   

We believe in unlocking the inner potential of each team member within an open and democratic culture.

Waiting for you on our team! 

Experience: 4+ years
Location: Remote from Poland
Contract: October 1 – December 31, 2026
 

About the Project

We are looking for a Senior Python Engineer / AI Platform Engineer to join a team working on cloud-based AI and data platforms.

The role combines Python backend development, data engineering, AWS, DevOps, and AI/LLM technologies. You will work on production-grade services, data pipelines, and AI-powered solutions, including RAG-based applications and document analysis tools.

Responsibilities

• Design and develop backend services using Python and FastAPI
• Build and maintain REST APIs and cloud-native backend components
• Design and implement ETL pipelines for processing and transforming large datasets
• Work with relational databases such as PostgreSQL
• Develop and operate containerized applications using Docker
• Work with AWS cloud services and modern DevOps practices
• Contribute to AI/LLM platform development, including RAG-based solutions and document analysis tools
• Support CI/CD processes and ensure reliable production deployments

Requirements

• 4+ years of experience in Python software engineering
• Strong backend development experience with FastAPI and REST API design
• Hands-on experience with ETL pipelines, data processing, and transformation
• Good understanding of PostgreSQL or similar relational databases
• Experience with Docker and containerized applications
• Practical knowledge of AWS, especially:
  • AWS Glue
  • AWS Batch
  • Amazon ECS
  • Amazon S3
  • Amazon ECR
• Experience with DevOps and CI/CD practices
• Previous experience working on AI/LLM projects

Nice to Have

• Experience with LLM/RAG-based applications
• Experience with document analysis platforms or chat interfaces
• Knowledge of Kubernetes
• Experience with OpenTelemetry
• Understanding of OAuth2
• Experience with cloud-native architectures

Tech Stack

Python, FastAPI, REST API, PostgreSQL, ETL, Docker, AWS, CI/CD, AI/LLM, RAG

Phoenix Games is an innovative technology company building next-generation iGaming and Web3 products for a global audience. We develop scalable backend systems powered by AI, blockchain, cloud technologies, and modern software architecture.

We're looking for Middle and Senior Backend Developers with strong experience in Python, Ruby, or PHP to help build reliable, secure, and high-performance backend services for our rapidly growing platform.

What You'll Do

• Design, develop, and maintain scalable backend services and APIs.
• Build high-performance microservices and distributed systems.
• Develop secure RESTful APIs and real-time backend functionality.
• Optimize application performance, scalability, and reliability.
• Design and improve database architecture and query performance.
• Integrate third-party services, payment providers, and cloud solutions.
• Collaborate closely with Frontend Developers, Product Managers, QA Engineers, and DevOps.
• Participate in architecture discussions, code reviews, and technical planning.
• Write clean, maintainable, and well-tested code.

Requirements

Middle

• 3+ years of commercial backend development experience.
• Strong knowledge of Python, Ruby, or PHP.
• Experience with at least one modern backend framework.
• Experience designing and consuming REST APIs.
• Good knowledge of relational databases.
• Understanding of OOP, SOLID principles, and clean architecture.
• Experience with Git.
• Upper-Intermediate English or higher.

Senior

• 5+ years of commercial backend development experience.
• Deep expertise in Python, Ruby, or PHP.
• Experience building scalable, high-load backend systems.
• Strong understanding of microservices and distributed architecture.
• Experience working with cloud platforms and containerized environments.
• Knowledge of caching strategies, asynchronous processing, and message queues.
• Ability to mentor engineers and contribute to architectural decisions.
• Strong focus on performance, security, and maintainability.
• Upper-Intermediate English or higher.

Nice to Have

• Experience with CI/CD pipelines.
• Familiarity with WebSockets or real-time systems.
• Knowledge of Web3, blockchain, or crypto-related technologies.
• Experience working in product companies.

What We Offer

• Fully remote work from anywhere in Europe.
• Long-term B2B cooperation.
• Competitive salary paid in EUR or USD.
• Annual salary reviews.
• Performance-based bonus program.
• Annual company bonus.
• 25 paid vacation days.
• Paid sick leave.
• Flexible working hours.
• Home office budget.
• Laptop or equipment allowance.
• Learning & development budget for courses, certifications, conferences, and books.
• English language lessons.
• Private health insurance.
• Mental health support program.
• Sports and wellness compensation.
• Team-building activities and international company retreats.
• Opportunity to work with AI, Web3, blockchain, and innovative products.
• Clear career growth opportunities in a fast-growing international product company.

Why Join Phoenix Games?

At Phoenix Games, you'll build modern backend systems that power innovative gaming products for a global audience. We value clean code, ownership, collaboration, and continuous learning. Whether your expertise is in Python, Ruby, or PHP, you'll have the opportunity to solve challenging engineering problems, work on impactful products, and grow with an ambitious international team.

Phoenix Games is a technology company building next-generation iGaming and Web3 products for a global audience. We develop scalable gaming platforms powered by modern cloud technologies, blockchain, AI, and high-performance backend systems.

As our products continue to grow, we're looking for a Junior+ Backend Developer who is passionate about backend development, enjoys solving complex technical problems, and wants to build reliable, scalable software used by players worldwide.

What You'll Do

• Develop and maintain backend services and APIs for our gaming platforms.
• Work with Go or Python to build scalable and reliable backend solutions.
• Design, implement, and integrate REST APIs and internal services.
• Work with databases and write efficient SQL queries.
• Investigate and troubleshoot bugs, performance issues, and production incidents.
• Write clean, maintainable, and well-tested code.
• Participate in code reviews and contribute to engineering best practices.
• Collaborate closely with QA Engineers, Product Managers, and other Developers throughout the development lifecycle.
• Participate in sprint planning, backlog refinement, and technical discussions.
• Contribute to improving system performance, reliability, and scalability.
• Work with cloud infrastructure and CI/CD pipelines.
• Learn and apply modern technologies related to gaming, Web3, blockchain, and AI.

Tech Stack

• Go / Python
• REST API
• PostgreSQL / SQL
• Git
• Docker
• Linux
• Redis
• Message brokers / asynchronous processing
• Swagger / OpenAPI
• CI/CD
• Cloud technologies
• Monitoring and logging tools

Requirements

• 1+ years of commercial backend development experience.
• Professional experience with either Python or Go.
• Good understanding of backend development principles and software architecture basics.
• Experience building or integrating REST APIs.
• Basic to intermediate SQL knowledge.
• Understanding of relational databases.
• Familiarity with Git and standard development workflows.
• Understanding of HTTP, JSON, and client-server architecture.
• Ability to read and understand existing code and independently investigate issues.
• Basic understanding of testing principles and writing unit tests.
• Experience working in Agile/Scrum teams.
• Strong analytical and problem-solving skills.
• Attention to detail and ownership mindset.
• Upper-Intermediate English or higher.

Nice to Have

• Experience with both Go and Python.
• Experience with PostgreSQL, Redis, or other backend data stores.
• Experience with Docker and containerized applications.
• Familiarity with CI/CD pipelines.
• Experience with AWS, GCP, Azure, or other cloud platforms.
• Understanding of microservices and distributed systems.
• Experience with message brokers such as Kafka or RabbitMQ.
• Familiarity with Kubernetes.
• Experience with high-load or real-time systems.
• Knowledge of performance testing or optimization.
• Interest in Web3, blockchain, AI, or iGaming technologies.

What We Offer

• Fully remote work from anywhere in Europe.
• Long-term B2B cooperation.
• Competitive salary paid in EUR or USD.
• Annual salary reviews.
• Performance-based bonus program.
• Annual company bonus.
• 25 paid vacation days.
• Paid sick leave.
• Flexible working hours.
• Home office budget.
• Laptop or equipment allowance.
• Learning & development budget for courses, certifications, books, and conferences.
• English language lessons.
• Private health insurance.
• Mental health support program.
• Sports and wellness compensation.
• Team-building activities and international company retreats.
• Opportunity to work with AI, Web3, blockchain, and modern cloud technologies.
• Career growth in an international product company with ambitious expansion plans.

We are New Wave Devs, a senior engineering team. We are hiring a Senior Go engineer to embed long-term with our client, a Netherlands-based AI-native creative-tools company building the backend of their AI Studio product.

It is a fast-paced product team: new frontier AI models are pushed into production within a day or two of release. You will own real pieces of the backend and work directly with their engineers.

What you will do:
• Design and scale Go microservices that manage the lifecycle of AI generations (image, video, audio, 3D, vector)
• Build and run RAG pipelines and agent orchestration around production models
• Handle long-running, resource-intensive inference tasks and high data throughput: queues, backpressure, retries
• Work with AWS (EKS, S3, Lambda), Kafka and SQS for async processing, ConnectRPC / gRPC / GraphQL
• Bridge AI model outputs into user-facing creative workflows

You should have:
• 5+ years backend, Go-first
• Hands-on LLM or RAG work that reached production, not API calls from a prototype: LangChain, LangGraph, pgvector or similar
• AWS (EKS/K8s), Kafka or SQS, gRPC/ConnectRPC, microservices at scale
• Ownership mindset, comfortable when specs are not perfect, able to switch between shipping fast and building for scale
• Real interest in the product itself. The client asks about it directly.
• Good English, daily work with the client team

We offer: long-term full-time contract through New Wave Devs, competitive rate, fully remote, fast start, days not weeks. Two technical interviews with the client's engineers, screen share and real code.

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.

About Flamingo

Flamingo is revolutionizing the Managed Service Provider (MSP) industry with an AI-driven, open-source platform for IT and security. Our goal is to empower MSPs with automation, optimization, and scalability tools to enhance their operations.

We are now expanding our system layer, developing cross-platform agents and background services written in Rust, designed to operate on Windows, macOS, and Linux environments. These agents form the backbone of our telemetry and device management capabilities across thousands of managed endpoints.
 

Role Overview:
 As a Client Engineer, you'll build reliable, high-performance system services and daemons that power Flamingo's open-source infrastructure for MSPs. You will work closely with backend engineers to design, implement, and optimize cross-platform components responsible for device management, monitoring, and secure data exchange.
 

Key Responsibilities:

• Develop cross-platform agents, daemons, and background services in Rust for Windows, macOS, and Linux
• Work with low-level system APIs and platform-specific tools: Win32 API, LaunchAgents/Daemons, systemd, and more
• Integrate services with backend infrastructure via HTTP, WebSockets, and NATS
• Write secure, asynchronous, and performant Rust code using Tokio, Serde, and Tracing
• Optimize real-time data processing, message handling, and network performance
• Collaborate with backend and platform teams to ensure reliability, observability, and security across deployments
• Contribute to our open-source projects by writing clean, documented, and community-friendly code

Our Stack:

• Language: Rust (1.8x+)
• Core Libraries: tokio, serde, anyhow, tracing, thiserror
• Networking: reqwest / hyper (HTTP), tokio-tungstenite / warp (WebSockets), nats.rs (NATS)
• Platform APIs:
  • Windows – Win32, COM, Registry
  • macOS – LaunchAgents, Daemons, Keychain
  • Linux – systemd, journal, epoll, nix crate
• Tooling: Git, GitHub, cross-platform builds

Must-Have:

• Strong proficiency in Rust, including async programming and ownership concepts
• Experience developing system-level software for at least one major OS (Windows, macOS, or Linux)
• Familiarity with platform APIs (e.g., Win32 API, systemd, macOS Daemons)
• Solid understanding of networking (TCP/UDP, WebSockets, HTTP)
• Experience with multi-threaded and asynchronous programming
• Attention to security, performance, and code maintainability

Nice-to-Have:

• Experience with NATS, message brokers, or real-time telemetry systems
• Experience building cross-platform agents or monitoring tools
• Contributions to open-source projects (especially in Rust)

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 Role

As a Block-Builder Engineer, you will take ownership of a production-grade, low-latency block-building platform and the systems around it.

You will work on the critical seal-and-submit path, block construction and bidding algorithms, parallel transaction simulation, secure builder-to-relay communication, and the off-chain logic supporting a new on-chain lending protocol and a trust-minimized TEE-based execution model.

A major part of the role is solving complex, open-ended engineering problems: improving bidding speed and efficiency, enabling capital to be safely borrowed and repaid within a single block, and creating mechanisms that prove correct system behavior without exposing competitive advantages.
 

Key Responsibilities

• Build and improve order-flow ingestion, bundle and transaction processing, relay submission flows, back-pressure mechanisms, and reintegration of channels into block construction.
• Develop and maintain observability tooling using Grafana, Prometheus, Loki, and SQL-based analytics, while identifying inaccurate or misleading metrics and dashboards.
• Design and execute production experiments, including A/B testing, data extraction, analysis, and clear reporting of results.
• Investigate and resolve production issues such as panics, dropped messages, latency regressions, and other reliability problems.
• Write tests and safeguards to prevent recurring failures and performance regressions.
• Contribute to optimization-driven block construction, protocol-level logic, and execution extensions such as BEX.
• Support the intrablock lending protocol by implementing both off-chain and on-chain components within the trusted-execution environment.
• Gradually expand into the exchange layer, building and maintaining high-throughput services that interact with trading systems.
   

Required Competence and Skills

• 2–4+ years of professional software engineering experience, including hands-on experience shipping and operating production systems.
• At least 2 years of experience working with Ethereum or other EVM-compatible blockchain protocols.
• Production experience with Rust is a strong advantage. Strong backend or systems engineering experience with Go, C++, or Java can also be considered if you are motivated and able to ramp up quickly in Rust.
• Experience working with concurrent, performance-sensitive, or real-time systems and confidence navigating a large existing codebase.
• Strong data skills, including SQL and experience using databases, logs, and production data to investigate system behavior and measure the impact of changes.
• Ability to use Python for analysis, automation, or internal tooling.
• Familiarity with monitoring and analytics tools, or a willingness to learn them, together with the ability to critically evaluate the accuracy of metrics and dashboards.
• A careful, data-driven engineering approach: validating assumptions, thoroughly testing changes, and distinguishing verified findings from hypotheses.
• Strong curiosity and ownership mindset, with an interest in understanding why production metrics change, identifying root causes, and iterating on solutions.
• Fluent English and willingness to work within Eureka Labs’ hybrid, office-first model in Poland.
   

Nice to Have

• Knowledge of or interest in Ethereum PBS, MEV, smart contracts, or trading systems.
• Experience with high-throughput data pipelines, time-series workloads, or large-scale analytics systems.
• Familiarity with reth, geth, or revm internals.
• Experience running production services with Kubernetes or Docker.

Who we are     

We are a Ukrainian multiproduct company for more than 500.000 clients from 120 countries.  

Since 1997, we have been streamlining data workflows for professionals and teams with our intuitive and efficient software products. We’re committed to enhancing our customers' experience across the globe by minimizing data-related tasks and enabling them to focus on more inspiring goals. Whether it’s Fortune-100 companies or individuals, we provide a customer-centric approach, delivering high-quality solutions and exceptional support.  
   

Product that needs your engagement     

Mobion is a cloud-based white-label platform for ride-hailing and corporate transport services. Launched in 2016 by Devart, it supports operators in 6+ countries and has handled over 20 million rides for 4M+ users and 500K drivers.  

Our ecosystem includes rider and driver apps, a real-time dispatch system, admin dashboards, and branded web portals — all backed by a secure, scalable Azure infrastructure. We offer both SaaS and franchise models to help partners grow fast across regions. 
 

Your future team of professionals     

You will lead and work closely with the Mobion Backend Team, currently consisting of four Backend Developers. In this role, you will combine hands-on engineering with technical leadership, helping the team make sound architectural decisions, improve engineering practices, and deliver reliable backend solutions. 

We value ownership, curiosity, collaboration, and open feedback. You will play a key role in mentoring developers, driving technical improvements, and creating an environment where the team can grow while solving real product and business challenges. 

Your future challenges and opportunities 

Opportunities 

• Lead the technical evolution of a business-critical backend platform used across multiple countries.  
• Shape backend architecture, engineering standards, and technical practices across the team.  
• Modernize a mature Node.js/TypeScript platform while continuing to deliver business value.  
• Mentor Backend Developers and introduce modern engineering practices, including AI-assisted development. 
   

Challenges 

• Balance continuous product delivery with gradual modernization of a complex production system.  
• Reduce technical debt and architectural coupling without disruptive rewrites.  
• Strengthen automated testing, observability, reliability, security, and CI/CD practices.  
• Lead technical change while aligning decisions across Product, QA, DevOps, Architecture, and Engineering teams. 
   

Impact you will make  

As Lead Backend Developer, you will take technical ownership of Mobion’s backend platform, combining hands-on development with architecture, engineering improvements, and team leadership. 

• Lead backend architecture and technical decision-making for the Mobion platform.  
• Combine hands-on Node.js/TypeScript development with technical leadership of the Backend Team.  
• Drive the gradual modernization of legacy components while maintaining platform stability and delivery speed.  
• Improve system performance, reliability, observability, automated testing, and CI/CD practices.  
• Mentor Backend Developers, support technical growth, and strengthen engineering standards across the team.  
• Collaborate with Product, QA, DevOps, and Software Architecture to turn business needs into scalable technical solutions. 
   

Skills we are looking for     

• 5+ years of hands-on backend product development experience with strong proficiency in Node.js and TypeScript.  
• 2+ years of experience as a Team Lead or Tech Lead, combining hands-on development with technical leadership.  
• Strong experience with SQL and NoSQL databases, including PostgreSQL/MySQL and Redis.  
• Experience designing and evolving distributed systems, REST/WebSocket APIs, and event-driven integrations.  
• Experience modernizing legacy systems through incremental refactoring, automated testing, and CI/CD practices.  
• Solid experience with cloud-native production environments, including Azure, Kubernetes, observability, reliability, and application security.  
• Experience driving technical improvements across architecture, code quality, and engineering practices, combined with strong mentoring and leadership skills. 
• Experience or strong practical interest in AI-assisted engineering and spec-driven development.  
• Experience with mobility, logistics, or transportation products is a plus. 

Benefits you get 

• Maintain your work-life balance 

Manage your own working hours with our flexible schedule 

19 days of annual vacation granted on a pro-rata basis 

No overtimes required 

• Hybrid type of cooperation 

Whether you prefer to work remotely in the comfort of your home office or from one of our 4 offices, you can still take part in increasing the world`s awareness about quality Ukrainian products from any part of the world 

• Stay healthy 

Medical insurance from one of the top insurance companies in Ukraine with a wide range of included services, as well as special programs for relatives; and special options for those who live abroad. 

15 working days of sick leave per year — because your health is a priority. 

• Grow with us 

In-house English courses — increase your proficiency through our online courses and speaking clubs with a native speaker 

Online learning activities — workshops, lectures, and webinars to enhance your leadership, management, and self-awareness skills 

Experience exchange — we are proud of our team of professionals who gladly share their deep expertise in all kinds of fields with the rest of the team 

Promotions, rotations, and transitions — when you believe your skills could benefit a different role or team. 

• Stand with Ukraine! 

We have an active pro-Ukrainian position, and that means we help our army, our servicemen, and their families not only through constant donations and volunteering, but also through our military leave policy, special health insurance options, and financial help 

We are a perfect match if you share our values 

We are professionals in our field. 

We know how to turn up our professionalism to the maximum, because we are experts who enjoy solving complex tasks. 

We know how to focus on the product, think big, and at the same time delve deep into the details. 

We create a calm and friendly atmosphere within the company. 

We value the freedom of open and transparent communications. 

Radical honesty is embedded in the foundation of our culture. 

We are open to new things and constantly develop and practice regular knowledge sharing, which helps us evolve continuously. 

Most importantly, the company creates an environment where we can fulfill our potential upon a solid foundation. 

Our Hiring Process 

• Recruitment Interview 
• Technical Interview 
• Case Interview 
• Offer Call 

We strive to ensure transparency and openness in the hiring process, and we understand the importance of providing timely feedback. If your resume meets the job requirements, we will contact you to clarify details and schedule an interview within 2 weeks after your application is submitted.  

The timeframe for feedback between interview stages may take up to 2 weeks. 

We’re growing and looking to hire a Software Team Leader - XSA who embodies our core values: People First, Customer Obsession, Strive for Excellence, and Integrity. Claroty is a global leader in cyber-physical systems (CPS) protection, dedicated to securing the critical infrastructure that keeps the world running. We’re a fast-growing, award-winning team where innovation meets purpose—and we want you to help us define the future of cybersecurity.

As a Software Team Leader for XSA (xDome Secure Access), you will lead the development of our industry-leading secure remote access solution. In a world where critical infrastructure is increasingly connected, your team will build the bridge that allows safe, monitored, and frictionless access to sensitive industrial environments. You will deal with complex networking challenges, identity management, and high-availability systems where security and performance are equally paramount.

Responsibilities:

• Drive a high-performing team of developers, fostering a culture of technical ownership, security-first mindset, and continuous delivery.
• Lead the design and implementation of robust secure access features, ensuring seamless integration between IT and OT networks.
• Oversee the development of scalable, high-performance gateway and proxy architectures that support global enterprise scales.
• Work closely with Product Management and Security Researchers to implement Zero Trust principles and advanced session monitoring capabilities.
• Invest in your team’s professional growth, promoting best practices in code quality, security protocols, and system resilience.

Requirements:

• 3+ years of experience leading R&D teams in a fast-paced environment.
• 5+ years of experience in backend development, with a strong track record of building complex systems in Python.
• Deep understanding of networking protocols (TCP/IP, HTTP/S, SSH, RDP) and security concepts (Zero Trust, Identity Management, Encryption).
• Experience building distributed, high-availability systems that handle real-time traffic and data.
• Proficiency in utilizing AI development tools (specifically Cursor and Claude) to accelerate development workflows, code generation, and problem-solving.

Would be a plus:

• Familiarity with frontend frameworks like Angular or React.
• Experience with Cloud-Native technologies (AWS/Azure/GCP, Docker, K8s).
• Experience in the Cybersecurity industry, specifically in Remote Access (VPN/ZTNA) or Identity (IAM).

What we offer

• Help and support from our caring HR team.
• 20 working days of annual paid leave.
• The exchange of experience and work with talented colleagues.
• Last but not least - valuable compensation for your efforts.

The Mission

Wallee Group is a leader in advanced payment solutions, dedicated to providing robust, scalable, and secure systems across multiple domains. We enhance customer experiences through innovative payment and finance technology that empowers businesses to grow efficiently. With operations spanning several countries, we thrive on collaboration and agility, utilizing the Scrum framework to drive our international teams. At Wallee, we stay at the forefront of market trends, continuously innovating to deliver premier services to our global customers.

The Role

To achieve our mission of providing the market's best payment experience, Wallee is seeking experienced and versatile java software engineers for our Vilnius office. As disruptors in the payment space, we build industry-leading systems that demand the highest standards of security and reliability. We are constantly pushing our solutions into new territories, and we are looking for engineers who thrive in a fast-paced, agile environment to help us redefine the future of finance.

Tasks

Your Impact

• Architect Scalability: Design and develop highly resilient back-end systems using Java, ensuring our infrastructure handles global scale with ease.
• Feature Innovation: Own the end-to-end lifecycle of new features, from initial implementation to refined bug fixing and performance tuning.
• Collaborative Engineering: Work closely with product managers, UX designers, and QA to translate complex business needs into elegant technical solutions.
• Code Excellence: Drive quality through automated testing, rigorous code reviews, and the creation of clear, maintainable technical documentation.
• Stay Ahead: Continuously research and evaluate emerging technologies and methodologies to keep Wallee at the cutting edge of the fintech industry.

Requirements

What You Bring to the Table

• Technical Depth: Advanced proficiency in Java and core frameworks such as Spring, Spring Boot, and Hibernate.
• Systems Thinking: Proven experience building distributed systems and scalable, high-availability solutions.
• Data Mastery: Strong proficiency in SQL and experience managing complex data structures.
• Modern DevOps: Hands-on experience with CI/CD pipelines (Jenkins/GitLab CI) and containerization (Docker, AWS ECS).
• Agile Mindset: A degree in Computer Science (or equivalent experience) and a track record of thriving in fast-paced, Agile environments.

• Bonus Points: Experience with JavaScript, Apache Camel, or BPM engines.

   

  Benefits:

• You are part of an agile, young international team and shape our products sustainably with your ideas.
• You will play a decisive role in designing products in an omni channel payment start-up and work with leading companies in the financial industry on international projects.
• We offer flexible structures and flat hierarchies.
• Cooperation with motivated colleagues and numerous personal development opportunities.

AI-native Web Developer

We're looking for a developer who uses AI as their primary development tool. For us, it's not about how many lines of code you write by hand—it's about how quickly you can turn ideas into working products using modern AI tools.

What You'll Do

• Develop new features and rapidly build prototypes using Claude Code, Codex, and similar AI tools.
• Turn ideas and rough requirements into working code in a short time.
• Develop and maintain PHP-based functionality.
• Continuously improve the product based on user and team feedback.
• Use LLMs not only for code generation but also to build AI-powered features, automations, and integrations.
• Work independently, make technical decisions, and take ownership of delivering complete solutions.

What We're Looking For

• Commercial experience with PHP development.
• Hands-on experience using AI tools as your primary way of developing software.
• Strong proficiency with AI coding tools such as Claude Code, Codex, or similar.
• Solid understanding of how to work effectively with LLMs: writing high-quality prompts, evaluating generated code, and refining it when needed.
• Good knowledge of web development fundamentals (HTML, CSS, JavaScript, HTTP, REST APIs).
• Ability to quickly understand and work with existing codebases, including legacy and AI-generated code.
• Self-motivated, proactive, and results-oriented.
• Willingness to quickly learn and adopt new technologies and tools.

Nice to Have

• Experience working with multiple AI agents simultaneously.
• A portfolio of projects built primarily with AI-assisted development.
• Experience rapidly building MVPs and prototypes.
• Experience integrating LLM APIs such as OpenAI, Anthropic, Google Gemini, or similar.

What We Offer

• Fully remote work.
• Minimal bureaucracy and fast decision-making.
• Access to cutting-edge AI development tools provided by the company.
• Challenging projects where you can directly influence the product's evolution.
• A team that values speed, initiative, and modern AI-driven development practices.

.NET Engineer (Microsoft Teams / Voice Platform)

We are looking for a .NET Engineer to join a product team working on a voice and communication platform with a strong focus on Microsoft Teams integrations.

The product handles voice communication workflows, calls, meetings, recordings, and communication data. In this role, you’ll be responsible for building and improving backend services that connect the platform with the Microsoft Teams ecosystem.

Responsibilities

• Develop backend functionality using C# / .NET and ASP.NET Core
• Build and support integrations with Microsoft Teams
• Work with Microsoft Graph API and Teams communication APIs
• Implement solutions for calls, meetings, recordings, and related communication data
• Develop and maintain REST APIs and integration services
• Diagnose and resolve production issues across Teams and voice-related functionality
• Improve system stability, performance, and scalability

• Participate in backend architecture and technical decision-making

   

Requirements

• 3+ years of professional C# / .NET development experience
• Strong background in backend engineering and ASP.NET Core
• Hands-on commercial experience with Microsoft Teams integrations
• Experience working with Microsoft Graph API
• Practical knowledge of APIs related to Teams calls, meetings, recordings, or communications
• Experience integrating external systems and third-party APIs
• Good understanding of SQL, databases, and backend design principles
• Ability to independently investigate and solve technical issues

• English level: B2 or higher

   

Will be a plus

• Experience with Microsoft Graph Communications APIs
• Teams compliance recording or other call-recording solutions
• Background in VoIP, telephony, voice platforms, or contact center solutions
• Experience with real-time audio/media processing
• Knowledge of WebRTC, SIP, RTP
• Experience with SignalR or WebSockets

• Experience with Azure

   

Who we’re looking for

We’re looking for a backend-focused engineer who already has practical Microsoft Teams integration experience and is comfortable working with complex communication APIs.

The ideal candidate understands not only .NET development, but also how calls, meetings, recordings, and real-time communication integrations behave in production.

What We Offer

• Long-term product project
• Transparent compensation
• Paid vacation and sick leave
• Learning and professional development support
• High-quality equipment
• Paid office lunches
• Anniversary gifts and baby bonus

Domain: Banking & Finance
Experience: 8+ years
Project Duration: October 1, 2026 – March 30, 2027
Format: Hybrid
Location: Wrocław, Poland

About the Project

We are looking for an experienced Senior .NET Application Developer to join a dynamic technology team based in Wrocław.

The role focuses on designing, developing, and maintaining scalable enterprise-level applications using .NET and Microsoft Azure. You will work closely with cross-functional teams in an Agile environment and contribute to technical solutions and continuous improvement of the development process.

Responsibilities

• Design, develop, and maintain scalable enterprise applications using C# and .NET
• Build and integrate RESTful APIs and microservices
• Develop cloud-native solutions using Microsoft Azure
• Contribute to application architecture and technical design decisions
• Work with Azure DevOps, CI/CD pipelines, and source control systems
• Ensure application quality through development best practices, testing, and code reviews
• Troubleshoot and resolve complex technical issues
• Collaborate with cross-functional teams in an Agile/Scrum environment
• Contribute to continuous improvement of development processes and solutions

Requirements

• 8+ years of professional software development experience
• Strong proficiency in C# and .NET, including .NET Framework, .NET Core, and .NET 8
• Solid hands-on experience with Microsoft Azure and cloud-native application development
• Practical experience designing and developing RESTful APIs and microservices
• Strong understanding of object-oriented programming, software design principles, and development best practices
• Experience with Azure DevOps, CI/CD pipelines, and Git or similar version control systems
• Good knowledge of relational databases, particularly Microsoft SQL Server
• Previous experience working in Agile/Scrum environments
• Strong analytical, troubleshooting, and problem-solving skills
• Excellent written and spoken English

Nice to Have

• Microsoft Azure certifications
• Experience with Docker, Kubernetes, or other containerization technologies
• Knowledge of event-driven architectures and Azure messaging services
• Exposure to modern frontend frameworks and technologies

Tech Stack

• C#
• .NET / .NET Core / .NET 8
• Microsoft Azure
• RESTful APIs
• Microservices
• Azure DevOps
• CI/CD
• Git
• Microsoft SQL Server
• Agile / Scrum

Preferred Technologies

• Docker
• Kubernetes
• Azure Messaging