Jobs Backend

About us:

EveryMatrix is a leading B2B SaaS provider delivering iGaming software, content and services. We provide casino, sports betting, platform and payments, and affiliate management to 200 customers worldwide.

But that's not all! We're not just about numbers, we're about people. With a team of over 1000 passionate individuals spread across twelve countries in Europe, Asia, and the US, we're all united by our love for innovation and teamwork.

EveryMatrix is a member of the World Lottery Association (WLA) and European Lotteries Association. In September 2023 it became the first iGaming supplier to receive WLA Safer Gambling Certification. EveryMatrix is proud of its commitment to safer gambling and player protection whilst producing market leading gaming solutions.

Join us on this exciting journey as we continue to redefine the iGaming landscape, one groundbreaking solution at a time.

We are looking for a passionate and dedicated Senior .Net Developer to join our team in Lviv!
 

What You'll get to do:

• Hands-on development and integration of the evolving business functionality on the core part of the platform with other office locations.
• Understanding business requirements and their mapping to the given software framework.
• Discussing business requirements along with the Team Leader, Business Analysts, Project Managers, and other parties involved.
• Adhering to the Agile methodology and design principles of the project.
• Working in a test-driven, object-oriented environment.
• Participating in the design and implementation of the new architecture of the next-generation GamMatrix platform.
• Offering the QA and support team assistance whenever issues arise.
• Adhere to best practice development standards (such as continuous integration and deployment).
• Ability to understand the complex technical architecture.
• Ability to manage multiple priorities, commitments and tasks.

What You need to know:

• Experience with ASP.NET 4+ Frameworks and .Net Core 3.1+.
• Good understanding and experience with relational database systems (MSSQL Server, PostgreSQL) GIT, CI/CD practices.
• Strong knowledge of OOP, SOLID principles, and design patterns.
• Experience with multi-thread programming.
• Experience using containerization technologies (Docker) and orchestration technologies (Kubernetes).
• Experience implementing and using message queues (Kafka, Rabbit MQ).
• Hands-on experience writing unit tests.
• Experience with distributed caching solutions (Redis).
• Knowledge of n-tier applications, distributed applications.
• English proficiency.

Nice to have:

• Strong knowledge of C#.
• Experience with building and managing microservices, parallel and asynchronous programming design patterns.
• Experience building REST APIs and self-description services (ex: Swagger).
• Experience with Log Systems: Grafana, Kibana.
• Experience with modern software development life-cycle.
• Development experience with web services.
• Self-motivated and result-oriented.
• Excellent communication skills (oral and written).
• Analytical mindset.
  
  Here's what we offer:
• Start with 22 days of annual leave, with 2 additional days added each year, up to 32 days by your fifth year with us.
• 3 sick leave days per year, no doctor's note required; 30 medical leave days with medical allowance
• Hybrid work schedule is available after the first three months of employment, with up to 50 days of work from home per year.
• Benefit from two Free Fridays each year, limited to one per quarter.
• Daily catered lunch or monthly lunch allowance. 
• Private Medical Subscription. 
• Access online learning platforms like Udemy for Business, LinkedIn Learning or O’Reilly, and a budget for external training.
• Gym allowance.
• Corporate English lessons.
• Support for New Parents:
• 21 weeks of paid maternity leave, with the flexibility to work from home full-time until your child turns 1 year old.
• 4 weeks of paternity leave, plus the flexibility to work from home full-time until your child is 13 weeks old.

Our office perks include on-site massages and frequent team-building activities in various locations.

At EveryMatrix, we're committed to creating a supportive and inclusive workplace where you can thrive both personally and professionally. Come join us and experience the difference! 
 

PLEASE NOTE that we are searching for candidates who are located in Lviv and are able to visit office in Lviv.

About us:

EveryMatrix is a leading B2B SaaS provider delivering iGaming software, content and services. We provide casino, sports betting, platform and payments, and affiliate management to 200 customers worldwide.

But that's not all! We're not just about numbers, we're about people. With a team of over 1000 passionate individuals spread across twelve countries in Europe, Asia, and the US, we're all united by our love for innovation and teamwork.

EveryMatrix is a member of the World Lottery Association (WLA) and European Lotteries Association. In September 2023 it became the first iGaming supplier to receive WLA Safer Gambling Certification. EveryMatrix is proud of its commitment to safer gambling and player protection whilst producing market leading gaming solutions.

Join us on this exciting journey as we continue to redefine the iGaming landscape, one groundbreaking solution at a time.

Project Overview: 
You will be working on a high-load backend system that exposes a REST API acting as a proxy between client applications and multiple internal services. The API dynamically retrieves, filters, processes, and merges data from various sources based on client parameters. To ensure optimal performance and scalability, the system leverages caching mechanisms, message brokers (RabbitMQ or Kafka), and search technologies like Elasticsearch. The architecture is designed to support high throughput and low latency, making it ideal for real-time data delivery in demanding environments. 

About the job: 
We are looking for a motivated Senior .NET Developer to join our dynamic team working on a high-load distributed system. You will contribute to the design, development, and maintenance of scalable backend services and APIs using modern .NET technologies. This role is ideal for someone with solid backend experience who is eager to deepen their expertise in distributed systems and microservices.
 

We are looking for a passionate and dedicated Senior .Net Developer to join our team in Lviv!

What You'll get to do:

• Design, develop, and maintain backend services and REST APIs using .NET Core.
• Participate in building and supporting microservices architecture.
• Integrate services with RabbitMQ and Kafka.
• Work with Redis for caching and Elasticsearch for search and analytics.
• Troubleshoot issues in development and production environments.
• Write clean, maintainable, and testable code.
• Perform code reviews and mentor team members.
• Take part in technical and architectural decisions.

What You need to know:

• 7 years of backend development experience with .NET Core.
• Experience with message brokers such as RabbitMQ or Kafka.
• Knowledge of Redis or Elasticsearch.
• Understanding of high-load and distributed systems.
• Strong problem-solving skills and attention to details.
• Ability to work effectively in a collaborative environment.

Nice to Have Experience:

• CouchDB or other NoSQL databases.
• Familiarity with CI/CD pipelines and DevOps practices.
• Experience with monitoring tools such as NewRelic, Grafana, or ELK stack.
   

Here's what we offer:

• Start with 22 days of annual leave, with 2 additional days added each year, up to 32 days by your fifth year with us.
• 3 sick leave days per year, no doctor's note required; 30 medical leave days with medical allowance
• Hybrid work schedule is available after the first three months of employment, with up to 50 days of work from home per year.
• Benefit from two Free Fridays each year, limited to one per quarter.
• Daily catered lunch or monthly lunch allowance. 
• Private Medical Subscription. 
• Access online learning platforms like Udemy for Business, LinkedIn Learning or O’Reilly, and a budget for external training.
• Gym allowance.
• Corporate English lessons.
• Support for New Parents:
• 21 weeks of paid maternity leave, with the flexibility to work from home full-time until your child turns 1 year old.
• 4 weeks of paternity leave, plus the flexibility to work from home full-time until your child is 13 weeks old.

Our office perks include on-site massages and frequent team-building activities in various locations.

At EveryMatrix, we're committed to creating a supportive and inclusive workplace where you can thrive both personally and professionally. Come join us and experience the difference! 
 

A global marketplace for savings and investments, providing users with seamless access to high-yield savings accounts and investment options from over 400 partner banks worldwide. The platform removes geographic barriers while ensuring transparency, convenience, and competitive rates. For banks, it delivers cost-efficient deposit funding and innovative Banking-as-a-Service solutions. The team is responsible for the integration of transaction accounts, hosted via our servicing banks, into the Raisin platform. They ensure smooth funding across all products, correctly routing incoming and outgoing payments to their intended destinations. The team consists of 10 members working collaboratively in a cross-functional setup.

Responsibilities:

• Deliver core services and high-quality solutions for a large-scale online platform and its banking systems.
•  Integrate externally developed components into existing applications.
• Define standards, share best practices, and contribute to continuous learning within the team.
• Perform software engineering tasks with a strong focus on quality and support teammates in maintaining the same standards.
• Conduct thorough code reviews, covering best practices, business rules, performance, security, and impact on other features/projects, always providing constructive and respectful feedback.
• Collaborate within the team to negotiate and document software development standards and practices.
• Research and propose multiple technical solutions whenever possible.
• Take end-to-end ownership of project delivery within the team.
• Maintain and manage technical documentation and address technical debt proactively.
• Participate in the hiring process through tech-fit interviews and technical challenge evaluations.

Requirements:

• 6+ years of overall software development experience.
• Minimum 5 years of experience with Java and Spring Boot.
• Strong understanding and hands-on application of design patterns.
• Practical experience with testing practices (unit, integration) using tools such as JUnit, Mockito, TestContainers.
• 4+ years of experience with AWS Services, Kubernetes, event-driven architectures (Kafka or ActiveMQ), Spring Boot, SQL, and NoSQL.
• Excellent communication skills with the ability to articulate challenges and solutions clearly.
• Proven team player who collaborates effectively and supports shared goals.
• Strong critical thinking and problem-solving skills, with the ability to analyze production issues and design robust solutions (highly desirable).
• Proactive in supporting teammates and driving technical improvements (strongly preferred).
• High responsibility when working with payments, as this is a critical, core functionality for the company.

We are looking for an experienced Python Software Engineer to join our team and help build AI-driven automation solutions. In this role, you will design and enhance intelligent workflows that automate internal processes and improve overall efficiency.

You’ll work closely with cross-functional teams, contributing to scalable systems and high-quality engineering practices in a fast-paced, product-oriented environment.
 

Responsibilities:

• Design, develop, and improve AI-powered workflows and services
• Implement new features and optimize existing functionality for performance and scalability
• Write and maintain unit and integration tests
• Participate in code reviews and contribute to engineering best practices
• Apply modern architectural approaches and industry standards
• Collaborate with other teams to deliver reliable and high-quality solutions
   

Required Qualifications:

• 5+ years of commercial software development experience
• Strong proficiency in asynchronous Python (e.g., asyncio, aiohttp)
• Hands-on experience with AWS services (Lambda, IAM, S3, SQS/SNS, EC2, ECS)
• Experience with CI/CD pipelines and DevOps practices
• Experience designing RESTful APIs, including security, versioning, and error handling
• Solid understanding of software architecture, design patterns, and data structures
• Strong communication skills and experience working in distributed teams
• Upper-intermediate level of English
   

As a plus:

• Experience building or working with agent-based (agentic) workflows
• Familiarity with Bedrock AgentCore or Strands SDK
• Experience with containerization (Docker, Kubernetes)
• Experience with AI-assisted development tools (e.g., Cursor, CLine, Claude Code)

About us

Syndicode is a value-driven software development partner with a globally distributed team of engineers, designers, architects, and IT managers. We are united by the mission to provide our clients with software products and services that perform, look, and work as designed.

We believe that our people and culture sustain Syndicode’s success. Our team is unified by shared principles like: Accountability, Involvement, Excellence, Visibility, Integrity, Innovation, Win-Win, and Flexibility. Syndicoders are professionals who pursue self-improvement through continual learning, are eager to introduce improvements to work processes, and can analyze a variety of sources to make sound, timely decisions.

If it sounds like you, apply to our jobs and become a new Syndicoder!

About the role

We're looking for a Senior B Engineer who brings strong backend fundamentals and an AI-native engineering mindset to a mature, multi-tenant B2B hiring marketplace platform. This is a high-ownership role: you'll be the primary backend engineer on a lean team, responsible for performance, reliability, and feature development across a complex Rails and React codebase serving multiple enterprise clients.
We're not looking for someone who has "used Copilot a bit" - we want an engineer who works with agentic coding tools as part of their daily workflow and can critically evaluate what those tools produce.

What you’ll be doing

• - Own backend development and code quality across a multi-tenant Rails 7.2 application
• - Identify and resolve performance bottlenecks — N+1 queries, slow endpoints, Elasticsearch tuning, caching strategy
• - Develop multi-tenant features with strict data isolation across enterprise clients
• - Monitor application health (New Relic, Cloudflare, Rollbar) and lead incident resolution
• - Build and maintain API endpoints integrated with a React frontend
• - Work within a multi-agent development workflow - where AI agents autonomously handle requirements intake, code generation, and code review

What you’ll need

• - 5+ years with Ruby on Rails; experience with Rails 7.x
• - React: comfortable with frontend integration and component work
• - PostgreSQL: query optimisation, indexing, performance profiling
• - Caching strategies: HTTP caching, Redis, application-level caching
• - Technical leadership: architectural decisions, code reviews, mentoring
• - Experience working with AI coding agents: beyond autocomplete, including multi-agent frameworks and orchestration tools
• - Ability to critically review, guide, and override AI-generated code
• - Terminal-first workflow: comfortable with CLI tools and scripting
• - Systems thinking: understand how changes affect multiple tenants and services
• - English: Upper-Intermediate or above

Nice to have

• - Elasticsearch: query tuning and search optimisation
• - Redis
• - Kubernetes and containerisation
• - Multi-tenant system design experience
• - Python
• - Familiarity with context limits and token economy in LLM-assisted workflows
• - Multi-agent orchestration experience

What you’ll get at Syndicode

• 15 days of vacation, 11 days off for holidays, and 20 sick leave days per year
• Fully remote job
• Internal tech meetups
• Continuous feedback within teams and departments
• Top-notch team
• Ability to participate in decision-making and bring new ideas
• Self-management: opportunity to manage your time and plan your activities
• Dynamic fast-growing environment: we react and adapt quickly to the world and market changes.

About Digis:

Digis is a European IT company with 200+ specialists delivering complex SaaS products, enterprise solutions, and AI-powered platforms worldwide. We ensure transparency, stability, and professional growth opportunities for all our team members.

About the Project:

The Project is a fast-growing UK-based startup building a next-generation acceleration engine for Apache Spark, used in large-scale data infrastructure worldwide.

At petabyte scale, even small inefficiencies in data processing translate into massive infrastructure costs. The Project is solving this by developing a novel engine that dramatically accelerates Spark workloads without requiring changes from data teams.

• $4.5M seed funding
• Founded in 2021, already in production
• Founders from top-tier tech companies (including Apple)
• Focus: Big Data, performance optimization, compilers
• Full-time, remote

Requirements:

• 7+ years of overall commercial software development experience
• Scala: 3+ years of experience
• C++: 2+ years of experience
• В2+ English (active communication in meetings)

Responsibilities:

• Own SQL acceleration features end-to-end — from design to implementation and measurable performance impact
• Implement and optimize Big Data processing algorithms across Scala, Java, and C++
• Develop performance-critical components at the intersection of Big Data and compilers
• Work with custom DSL and code generation systems to extend query execution capabilities
• Contribute to cross-language integrations (Java ↔ C++ via JNI) and overall system performance improvements

Why This Role is Exciting:

• Real impact on petabyte-scale data processing
• Combination of high-level (Scala/SQL) and low-level (C++) engineering
• Work on cutting-edge challenges at the intersection of Big Data + compilers
• Product already in production with strong funding and growth potential

If this sounds like the right opportunity for you, apply now! We look forward to discussing this further.

In a partnership with a global consulting company we are looking for a skilled Scala Engineer to join our team and help build high-performance, scalable backend systems. You’ll be working with a modern functional stack to solve complex data challenges and optimize our distributed architecture. The client is a British multinational enterprise software company.

The Tech Stack:

• Language: Scala 2.13
• Framework: Play Framework (Pekko-based)
• Data: MySQL, Redis
• Infrastructure: AWS Services
• Monitoring: Grafana, Kibana

Core Responsibilities:

• Design and maintain robust backend services using Scala and the Pekko-based Play Framework.
• Write clean, testable code emphasizing immutability and functional programming principles.
• Optimize database performance through SQL profiling, indexing, and query refinement.
• Manage and deploy cloud-native applications within the AWS ecosystem.
• Collaborate through a structured CI/CD pipeline and Git-based PR workflow.

Technical Requirements:

• Scala Mastery: Deep knowledge of the Scala standard library, specifically collections, Futures for concurrency, and pattern matching.
• Database Expertise: Strong proficiency in SQL. You should be comfortable explaining execution plans and optimizing slow queries.
• Cloud Proficiency: Hands-on experience with core AWS services (e.g., EC2, RDS, S3, or Lambda).
• DevOps Mindset: Solid understanding of version control (Git) and automated deployment flows.

Nice to Have:

• Experience with functional persistence libraries like Doobie or Squeryl.
• Familiarity with observability tools; specifically building Grafana/Kibana dashboards and configuring alerts.
• Direct experience with horizontal scaling and managing state in large-scale distributed Pekko systems.
  
   

EJAW is a software development and art creation agency that delivers services to game developers, media companies and other organizations alike around the world since 2010.

Looking for a Golang Developer to join our team

What kind of professional are we looking for:

• Availability of own or freelance projects
• Databases (sql, PostgreSQL)
• Rest API and GRPC
• Docker/Docker Compose
• Knowledge and understanding of OOP
• Git (BitBucket).

Why do we enjoy working here:

• Remote work with flexible schedule
• Competitive salary in $
• 18 days of paid vacation leave
• 12 days of paid sick leave
• A friendly team of professionals
• Interesting innovative projects.

The selection process:

• Interview with HR
• Technical interview
• Offer

Suplery is looking for a backend developer to create and develop one of the company's products. We are developing a B2B solution that optimizes the ordering of professional cosmetics from suppliers to beauty salons, clinics and stores and reduces supplier costs by 30-35%.

Required skills

– 3+ years of experience with .NET Core (C#): ASP.Net Core + Entity Framework Core
– Experience in writing REST APIs
– Knowledge of both LINQ and SQL
– Deep understanding of CLR
– Understanding of how to use AI in development

Important
– Optimization of complex SQL queries
– GitHub actions, Docker
– Google Cloud & Google Cloud API (Storage, Cloud Run, Tasks, Artifact Registry, Secrets Manager)
– Understanding good architecture practices and ability to use them in code.
– Product-oriented. The developer does not just perform the task, but understands the users' problems and finds the optimal solution.
– Ability to ask questions and get to the heart of the problem.
– Ability to argue the decisions made.

Responsibilities
– API design and development
– Development+optimization of data processing and complex SQL queries
– Integrations with external services
– Fixing bugs and optimizing current functionality
– Describing documentation for Swagger

We offer
– Opportunity to influence the product by creating and developing it.
– A friendly team of professionals. No bureaucracy, individual approach and adequate management.
– Professional growth and knowledge sharing in the team.
– Flexible schedule.

About Suplery

Suplery is an order automation and B2B marketplace in professional cosmetics industry.

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

- Readiness to work in the ET (US) time zone

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;

- Health insurance program;

- Flexible working hours;

- Sponsored company educational program, corporate library;

- Comfortable and cozy office;

- Funny celebrations, team outings, and company events;

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

We are seeking a highly skilled PHP Developer to join our dynamic team, specializing in building and maintaining robust, high-performance web applications. If you have a strong background in Symfony, MySQL 8.0, Redis, MongoDB, and experience managing high-load and big data projects, we want to hear from you!

Responsibilities:

Develop, test, and maintain web applications using PHP and Symfony.

Design and optimize complex databases, primarily MySQL 8.0, ensuring high performance and scalability.

Work with MongoDB for managing and optimizing unstructured data storage.

Integrate and manage message queues using RabbitMQ for asynchronous processes.

Utilize AWS cloud services (EC2, S3, RDS, etc.) to deploy and manage applications in a scalable, secure environment.

Collaborate with cross-functional teams to define, design, and ship new features.

Identify and resolve performance bottlenecks and bugs.

Ensure the best possible performance, quality, and responsiveness of applications.

Stay updated with the latest industry trends and technologies to bring innovative solutions to the team.

Requirements:

Proven experience as a PHP Developer with a deep understanding of the Symfony framework.

Expertise in MySQL 8.0, including performance optimization, indexing, and query optimization.

Experience with message queue systems, particularly RabbitMQ.

Hands-on experience with AWS services and infrastructure.

Solid understanding of high-load and big data application development.

Strong analytical and problem-solving skills, with a keen eye for detail.

Preferred Qualifications:

Experience with containerization and orchestration tools (Docker, Kubernetes).

Previous experience in a DevOps environment.

Understanding of front-end technologies (JavaScript, React, Vue.js) is a plus.

Our client is one of the leading companies on the market which provides Big Data, Data Integration, Data Preparation and Enterprise Application Integration software and services. Its products allow to build data integration process, migrate data safely, process big amount of data, cleanse data and check its quality.

Connector is a core element of the products, which allows to connect, extract data from a data source, transform data according to business needs and load data back to some storage. It is used in traditional software such as Studio for Data Integration as well as in the modern Cloud services.

Continuous emerging of new technologies and data repositories lead to demand growth of creating new connectors and adapting the existing ones.

For this reason, we are looking for a Java developer to join the team to address the demand and provide our client with the best quality service.
 

Requirements:

• Good knowledge of Java Core 8
• Some experience with SQL (knowledge of JDBC is a huge plus)
• Understanding and some experience in testing techniques (JUnit)
• English (both spoken and written) at least at Intermediate level that allows communicating with an international team on a daily basis

 Optional but desirable:

• Pet projects on Java Core
• Knowledge of JSON, XML
• Knowledge or experience with development and CI tools: Git/GitHub, Maven, Docker

Job responsibilities:

• Design and implement Talend Connectors (see below)
• Unit and Integration testing
• Respond to feature requests, bug reports, performance issues and ad-hoc questions

Advantages:

• Smooth onboarding process
• Working under the supervision of a skilled teammate
• Chance to work with a great variety of technologies and DBs (both SQL and non-SQL such as Snowflake, PostgreSQL, Mongo, Cassandra, DynamoDB, Neo4j)
• Work collaboratively in a distributed international team (France, Germany, China)

We are looking for a Senior Full Stack Developer to join our team to produce scalable software solutions. You’ll be part of a cross-functional team that’s responsible for the full software development life cycle, from conception to deployment. As a Senior Full Stack Developer, you should be comfortable around both front-end and back-end coding languages, development frameworks and third-party libraries.

What you'll do

• Discover and implement new technologies that yield competitive advantage
• Find opportunities to automate manual processes and creatively add value to the project
• Maintain high standards of software quality within the team by establishing good practices and habits.
• Identify and encourage areas for growth and improvement within the team.
• Work with the development team and product managers to ideate software solutions
• Design client-side and ideally server-side architecture
• Build the front-end of applications through appealing visual design
• Ideally develop and manage well-functioning databases and applications
• Supervise system infrastructure to ensure functionality and efficiency
• Monitor KPIs to assess technological performance
• Be able to write effective APIs
• Test software to ensure responsiveness and efficiency
• Troubleshoot, debug and upgrade software
• Experience with browser-based debugging and performance testing software.
• Use stakeholders’ feedback to inform necessary improvements and adjustments to technology

Must have

1. JavaScript & TypeScript: Proficiency in JavaScript and solid experience (or strong interest) in using TypeScript.
2. Frontend & Layout: Experience with semantic HTML, CSS, and static site generators such as Next, Gatsby, or Nuxt.
3. PHP Backend: Proven experience developing web applications with PHP, preferably using frameworks like Laravel or Symfony.
4. Data Management: Relational Databases: MySQL, PostgreSQL, NoSQL & Caching (Desired Plus): Redis, OpenSearch.
5. Infrastructure & Tooling: Familiarity with Docker and browser-based debugging software.

What we offer

• Competitive compensation depending on experience and skills
• A friendly team of like-minded people
• Opportunities for learning and development
• Compensation for sick leaves
• 21 working days paid vacation + all Poland national holidays
• Corporate events and activities
• Private medical care
• Office work or remote working (based on your location)

Our Customer:

A global technology company developing real-time video augmentation and rendering infrastructure for broadcast and streaming environments.

Your tasks:

• Develop and maintain the backend pipeline to monitor, synchronize, and manipulate video streams such as SRT & HLS and MySQL resources on the cloud;
• Integrate and manage modules written both in C++ and Node.js;
• Implement a complex metadata system over AWS, including S3 security access and acceleration;
• Design and deploy backend architecture (NodeJs) to manage data allocation and pipeline control;
• Create and maintain a dashboard to monitor pipeline status and performance.

Required Experience and Skills:

• Over 8 years of experience with Node.js;
• Experience with AWS, including S3, RDS, and CloudFront;
• Experience in real-time video processing;
• Deep understanding of rendering synchronization techniques for multimedia content in a web browser environment;
• Hands-on experience with WebGL;
• Familiarity with DRM video streams (SRT, HLS) and Image Processing in the browser;
• Excellent problem-solving skills and attention to detail;
• Ability to work independently and in a collaborative team environment;
• Strong communication skills;
• English – Upper-Intermediate.

Would be a plus:

• Experience with database management, particularly MySQL;
• Experience with C++ realtime programming;
• Knowledge of modern DevOps practices and tools;
• Previous experience with sports broadcasting and AR technology.

About the Role
 

We are looking for a Senior Backend Engineer (Go / Golang) to join our team for a long-term product development project.

The frontend team (3 developers) is already formed. We are now strengthening the backend side.

This is a hands-on development role focused on building scalable APIs and backend services.
 

Responsibilities

• Develop backend services using Go (Golang)
• Design and implement REST APIs
• Work with PostgreSQL databases (schema design, optimization)
• Integrate third-party services
• Implement authentication & authorization (JWT, OAuth)
• Optimize performance and improve system reliability
• Collaborate closely with the frontend team
• Participate in technical discussions and estimations

Requirements

• 4+ years of commercial experience
• 3+ years of experience with Go (Golang)
• Experience with Gin, Echo, Fiber or similar Go frameworks
• Strong experience building REST APIs
• Experience with PostgreSQL
• Understanding of concurrency (goroutines, channels)
• Experience with Docker
• Experience with AWS (EC2, RDS, S3)
• Experience with Git
• Understanding of CI/CD processes

Nice to Have

• Redis
• Kafka / RabbitMQ
• Microservices architecture
• Kubernetes
• Experience with SaaS or marketplace products
• Swagger / OpenAPI
• Unit testing in Go

What We Offer

• Long-term full-time engagement
• Stable workload
• Product development from early stages
• Direct communication, no bureaucracy
• Opportunity to grow within the project