Jobs Backend

N-iX is a global software development service company that helps businesses across the globe create next-generation software products. Founded in 2002, we unite 2,400+ tech-savvy professionals across 40+ countries, working on impactful projects for industry leaders and Fortune 500 companies. Our expertise spans cloud, data, AI/ML, embedded software, IoT, and more, driving digital transformation across finance, manufacturing, telecom, healthcare, and other industries. Join N-iX and become part of a team where your ideas make a real impact.

Nowadays, finding a long-term job with an interesting project can feel like a real challenge.

But hey — if you're an experienced Technical Lead / Full Stack Engineer (Java + React), look no further!

Yes, it's real. You're not dreaming. Miracles do exist!

When it comes to our customer – a strategic partner of ours in the integrated Shipping Services. They have set themselves apart as an independent carrier with a fresh, unique approach. Their strategy as a global niche carrier offers distinctive advantages to customers worldwide. We have created a smart, efficient network that ensures stable, reliable services; and we have made it our mission to focus on the needs of our customers, which stand at the heart of all our decisions. The main idea of our product operates in select trades, where it has a competitive advantage and where it can provide superior service. We maintain a flexible partnership approach with other major carriers, and our new line structure is a much-needed alternative to customers concerned about the current alliance-dominated market.

Responsibilities:

• Guide, mentor, and foster the growth of full-stack engineers within the team, championing engineering excellence and XP practices.
• Lead the architectural design and technical direction of innovative full-stack applications, ensuring scalability, security, and alignment with business goals.
• Establish and champion high standards of code quality, testing (TDD/BDD), CI/CD pipelines, and robust DevOps practices.
• Act as a key technical point of contact, collaborating closely with product owners and stakeholders to translate complex requirements into actionable technical strategies.
• Direct full-stack development of innovative applications, remaining actively involved in writing code and remote pairing.
• Own the entire development cycle, including design, architecture, development, testing, and DevOps deployment.
• Foster a highly collaborative Extreme Programming (XP) environment featuring remote pairing and rapid feedback loops.

Requirements:

• BS degree in Computer Science or an equivalent combination of education and experience.
• Experience in technical leadership is a must.
• 6+ years of full-stack development experience.
• 6+ years of experience in the following technologies: Java, Spring.
• Proven experience with Functional Programming and Java Streams.
• 2+ years of experience in front-end development with React.
• Experience with developing a reactive UI (Reactive JS).
• 2+ years of experience in TDD/BDD development in the following frameworks: JUnit, Jasmine, Mockito, Protractor/Selenium.
• 2+ years of experience in microservices-based architecture and tools (Spring Boot/Cloud).
• AI experience 
• Experience in DevOps development and Jenkins (must).
• Experience in development in Kotlin – an advantage.
• Experience in designing, developing, and deploying cloud/hybrid-based solutions.
• Experience in developing and deploying in Container-based environments (Kubernetes, Cloud Foundry).
• Deep familiarity with the following design concepts: microservices, service discovery, circuit breakers.
• Strong leadership abilities with the capacity to appropriately prioritize, plan, and delegate complex work in a rapidly changing environment.
• Versatility and capability to switch easily between different tasks and technologies.
• Experience in assessing a broad range of information solutions and products.
• Strong critical thinker with an exceptional problem-solving aptitude.
• Excellent English skills - both verbal and written.

• Розробка / Налаштування API методів для обміну даних
• Розробка дашбордів, написання SQL-скриптів
• Робота з PostgreSQL (1 млн.+ рядків)
• Підтримка та оптимізація існуючих розробок
• Ведення проектів у Git, робота з гілками та налаштування CI/CD

Твій ідеальний профіль:

Must-have

• Python 2+ роки (DocString, типізація, лінтери)
• Airflow, від 6 міс
• Впевнене володіння SQL (віконні функції)
• Docker

•  фреймворками та налаштування API методів для обміну даними
•  інструментами data analysis, як приклад Tableau, Power BI
•  Cloud середовищами
•  Apache Superset

• Високонавантажені системи з реальними викликами масштабування
• Сучасний стек та свобода технологічних рішень
• Можливість впливати на архітектуру продуктів, якими користуються мільйони

• Менторство від сеньйорів з досвідом enterprise-рішень
• Разом будуємо інновації, що працюють для мільйонів

• Продукт, що змінює країну — не просто ще один стартап
• Тут команди стають драйверами технологічних змін

• Компенсація додаткових витрат, пов’язаних з робочими завданнями, здійснюються до внутрішніх політик компаній.
• Добровільне медичне страхування та страхування життя.
• Корпоративні знижки від партнерів NOVA.
• Підтримка ментального здоров’я. Можливість безоплатних консультацій з корпоративним психологом.
• Соціальна відповідальність та волонтерський рух «Свої для своїх».
• Клуби за інтересами: біговий, шаховий та інші ініціативи для натхнення.
• Соціальні відпустки та компенсації відповідно до КЗпП України.

Primary Skills:

5+ years of professional software engineering experience with a strong emphasis on scalable frontend architectures.

Proven proficiency in utilizing AI-assisted coworker tools (Claude preferred) to accelerate frontend development to improve engineering productivity, code quality, testing, and development velocity.
Mastery of modern frontend technologies: React, GraphQL, Redux, Vite, TypeScript, HTML5, and CSS3.
Solid mastery of Testing frameworks (Playwright, Jest, Vitet, Cypress)
Solid understanding of backend integration points, particularly interacting with GraphQL, REST APIs, and authentication flows.
Experience with observability platforms and UI performance optimization techniques.
Data Access: Proficiency with Entity Framework for ORM.
API Documentation: Experience using Swashbuckle to generate and maintain Swagger documentation.

Preferred, Not Required Skills
Version Control: Proficiency with Git and GitLab.
Collaboration: Experience working with Jira and Confluence.

Job Responsibilities

Partner closely with Product, Design, and Backend Engineering teams to translate complex business requirements into intuitive user experiences.
Provide dashboards, charts, and filtered views for sensor telemetry and alert trends to support end-to-end solution monitoring.
Develop detailed topology visualization and cross-org super-admin dashboards.
Unify gateway management and sensor data experiences so customers can move between fleet operations and troubleshooting in a single workflow.
Utilize AI-assisted coworker tools to rapidly generate React components, GraphQL queries, and unit tests.

Department/Project Description

Partner is one of the leaders in design, development and manufacturing data communications equipment for the industrial Internet of Things — connecting physical assets to business processes to deliver enhanced value.

Developting cloud-based platform hosted on Azure using .NET tech stack. The platform interacts with different corporate services in order to support business processes across company in manufacturing, engineering, sales, shipping, etc.

Skill Category

.NET

Keyskills - Must Have

• .NET
• Entity Framework
• MS SQL Server
• ReactJS
• Azure
• redux
• TypeScript Technologies: .NET
• Playwright

Responsibilities:

• Work in SCRUM team 
• Design and develop high-load microservices
• Produce high-quality code covered with different levels of tests
• Maintain services on production and assure their stability and performance
• Provide code review for teammates 
• Contribute to the Company’s development processes and practices 

Requirements:

• 5+ years of professional Java development experience, including at least 2 years in a product company or product-focused environment
• Proficiency in Java 17+ and modern backend development practices
• Solid experience with the Spring Framework and Spring Boot
• Practical experience designing and developing microservices
• Experience with MySQL, Redis, and other SQL or NoSQL databases
• Experience with Kafka and event-driven architectures
• Experience building REST APIs and working with Protobuf
• Hands-on experience with SQL and database schema design
• Experience with CI/CD practices and tools such as GitLab CI
• Ability to write unit and integration tests using tools such as Mockito, WireMock, and Testcontainers
• Strong understanding of SOLID principles, clean code, and common software design patterns
• Experience with Git and modern software development workflows
• Excellent troubleshooting and problem-solving skills
• Good communication and collaboration skills
• English proficiency at Intermediate level or higher

AI-enabled software development

• Hands-on experience using AI coding agents in day-to-day software development.
• Ability to break down engineering goals into clear, well-scoped tasks for AI agents.
• Ability to provide effective context, constraints, acceptance criteria, and validation steps.
• Strong awareness of the risks and limitations of AI-generated software.
• Ability to distinguish where AI can accelerate delivery and where human judgment is essential.
• Interest in exploring and improving agentic development workflows.
• Willingness to share effective workflows and lessons learned across engineering team.

Would be great to have:

• Experience with Aerospike
• Experience with Spring Cloud
• Experience with Docker and Kubernetes
• Experience developing and operating high-load distributed systems
• Experience with Google Cloud Platform (GCP) and its core services, including BigQuery

What we offer:

• International company with several offices in different locations : Tel-Aviv, Kyiv, Warsaw, Limassol.
• Granting an Option;
• A professional environment with great people to work with;
• Competitive salary, performance review;
• Flexible working hours, no one here tracks your work time because our culture is built on trust and cooperation;
• Social and welfare packages;
• 20 working days paid vacation, official public holidays and 100% sick leave coverage;
• Opportunities to make a difference, to develop and grow;
• Regular corporate celebrations, team building and fun activities;
• Comfortable office in the city center. Our Kyiv office is open 24/7 with all safety and health measures in place.

Meet the YozmaTech

YozmaTech isn’t just another tech company – we’re a global team of go-getters, innovators, and A-players helping startups and product companies scale smarter and faster.
We build dedicated development teams across 10+ countries, creating strong, long-term partnerships based on trust, transparency, and real impact.
Here, every idea counts. We value people who are proactive, open-minded, and ready to grow. If you’re passionate about building meaningful products and want to join a team that feels like family – you’ll feel right at home with us.

Our client is a pioneer in the field of identity data solutions, is revolutionizing how businesses confidently identify their customers and prospects across multiple touchpoints. Whether it’s through websites, applications, or physical locations, they provide innovative ways for their partners to interact with and understand their audiences.

We are looking for a Senior Backend Engineer to help scale a high-throughput, real-time bidding
platform that sits at the core of our header-bidding and identity products. You will design and
operate Go services that handle very high request volumes with tight latency budgets, working
close to the auction path where milliseconds and correctness both matter.
This is a hands-on engineering role on a fast-growing product. You will own services end to end
— from design and implementation through deployment, observability, and on-call — and
collaborate with product, QA, and business-development colleagues to ship integrations with ad-
tech partners and demand/supply platforms.

Key Requirements:
🔹 Strong, production-level experience writing backend services in Go (Golang), including the
concurrency model, profiling, and performance tuning.
🔹 Demonstrable experience with header bidding — ideally hands-on with Prebid (Prebid
Server adapters, modules, or comparable auction-side work).
🔹 Experience building and operating high-throughput, low-latency distributed systems in
production
🔹 Solid grasp of HTTP/REST, JSON, and server-to-server integration patterns, plus
debugging across the request lifecycle
🔹 Comfort with relational databases (e.g. MySQL / Aurora) and cloud infrastructure (AWS),
including basic observability and deployment workflows
🔹 Pragmatic testing habits and a track record of shipping reliable software with good
operational hygiene
🔹 Strong debugging and problem-solving abilities;
🔹 Experience with CTV/video and post-bid measurement flows
🔹 Exposure to Prebid Server Java or other JVM services (useful for cross-module work). Experience with Kafka/streaming, Redis or similar caching layers, and container
orchestration (Docker/Kubernetes)
🔹 English – Upper-Intermediate or higher

What you will do:
🔹 Design, build, and operate high-throughput Go services on the real-time bidding and
header-bidding path, optimizing for latency, reliability, and cost at scale.
🔹 Develop and maintain Prebid integrations — Prebid Server adapters, bidder/identity
modules, and the supporting backend that powers them.
🔹 Build and harden integrations with ad-tech vendors (SSPs, DSPs, identity, and
measurement partners), including pixel, post-bid, and server-to-server flows
🔹 Profile and tune hot paths: concurrency, memory allocation, connection pooling, caching,
and request fan-out under high QPS
🔹 Own services through their full lifecycle — instrumentation, dashboards, alerting, and
participation in the on-call rotation.
🔹 Partner with product, QA, and business development to scope new partner integrations and
turn requirements into reliable, well-tested code.
🔹 Contribute to architecture decisions, code reviews, and engineering standards across the
Bidfusion team

Interview stages:
🔹 HR Interview;
🔹 Technical Interview;
🔹 Final interview;
🔹 Reference Check;
🔹 Offer;
 

Привіт!
Checkbox — українська продуктова фінтех-компанія. Щомісяця ми фіскалізуємо понад 100 мільйонів чеків для 100+ тисяч підприємців і швидко зростаємо.

Ми шукаємо сильного PHP-розробника, який упевнено працює з високонавантаженими системами та готовий вести розвиток продукту: апгрейд стеку, міграцію черг і побудову автоматизованих перевірок у CI.

Технічний стек:

PHP (7.4 → 8.x), Symfony (4.4 → 6), API Platform 2.5, Doctrine ORM, PostgreSQL, Symfony Messenger, RabbitMQ, Kafka, Redis, Docker.

Наші очікування: 

• Комерційний досвід із Symfony та PHP; упевнене володіння версіями 7.4/4.4 і 8.x/Symfony 6.
• Досвід апгрейду фреймворку або платформи на великій системі: планування етапів, збереження темпу продуктової розробки, контроль регресій.
• Досвід із API Platform (serialization groups, фільтри, extensions, кастомні data providers) — велика перевага.
• Глибоке володіння Doctrine ORM: діагностика повільних запитів, розуміння вартості lazy- та eager-завантаження, обробка великих обсягів даних без витоку пам'яті.
• PostgreSQL: читання плану виконання, проєктування індексів, розуміння вартості DDL на таблицях у десятки мільйонів рядків.
• Проєктування REST API: версіонування, зворотна сумісність, пагінація на великих обсягах, ідемпотентність.
• Асинхронна обробка: досвід із RabbitMQ або аналогом; розуміння поведінки черг (дублікати, порядок, ретраї, застряглі повідомлення). Досвід із Symfony Messenger.
• Інтеграції зі сторонніми сервісами (3rd party services): тайм-аути, ретраї з backoff, ідемпотентність, звірка станів.
• Мультитенантність: авторизація та рольова модель, ізоляція даних між клієнтами, робота із секретами й персональними даними.
• Досвід роботи у великій кодовій базі: безпечні інкрементальні зміни.
• Тестування: PHPUnit або аналоги; уміння покрити тестами складний код.
• Розуміння, що має перевірятися в CI (тести, статичні аналізатори), і вміння підготувати відповідне рішення.
• Робота під навантаженням: пакетна обробка великих обсягів, читання з репліки, конкурентність і блокування.
• Docker, Git-флоу, code review на рівні щоденної роботи.
• Самостійність: декомпозиція складних задач і доведення їх від ідеї до продакшену.

• Kafka в проді: партиції, consumer groups, at-least-once і його наслідки.
• Досвід у фінтеху, платежах або сферах, де помилка коштує грошей.
• Redis, розподілені блокування, rate limiting.
• Досвід із GitLab CI.
• Менторство або вплив на технічні стандарти команди.

• Проактивність: бачите проблему — пропонуєте і реалізуєте рішення.
• Уміння аргументовано відстоювати технічні рішення й водночас чути команду.
• Аналітичне мислення, робота зі складністю та невизначеністю.
• Зрілість у технічних рішеннях: здатність пояснити ухвалене рішення та оцінити його з дистанції часу.
• Самоорганізація, відповідальність і дотримання дедлайнів.

• Повністю віддалений формат співпраці.
• 24 робочі дні відпустки та оплачувані лікарняні.
• Стабільна виплата зарплати двічі на місяць.
• Підтримка професійного розвитку: курси, конференції, сертифікації.
• Курси англійської мови.
• Мінімум бюрократії в ухваленні рішень.

Ajax Systems is an international technological company and Europe’s largest security system manufacturer. The product portfolio includes 280 wireless and wired devices for security and automation. Today, Ajax protects over 4.5 million users in 187 countries worldwide.

We are looking for a smart and technically proficient Middle/Senior Java Developer to join our team in Kyiv office.

The team develops internal tools to automate the management of manufacturing operations. The goal is to transform how our factories are planned and managed, taking the organization to a new level of operational efficiency and control within the next year.

Responsibilities:

• design and implement core backend services and data pipelines.
• Write clean, readable, and maintainable code.
• Develop services for the B2B product line.
• Actively participate in developing and improving the architecture.
• Document architectural decisions and operational knowledge for successful deployment and service operations.
• Ensure appropriate test coverage with unit and integration testing.
• Focus on performance and cost efficiency within your areas of responsibility.
• Follow best practices in software design and development and promote them within the team.
• Ensure reliable alerting, dashboards, and runbooks for production services.
• Debug production issues, analyze complex cases, and conduct investigations.
• Work smoothly in a technical culture with testing, CI/CD, and DevOps.
• Collaborate within the team and with other engineering teams to develop new features and products according to business needs.

Required experience:

• 4+ years of professional experience in Java development in an enterprise environment.
• Strong understanding and practical experience with Java Concurrency.
• Strong knowledge of Kotlin or solid Java expertise with a willingness to transition to Kotlin.
• Practical experience with Spring and SQL.
• Hands-on experience with analytical databases such as Databricks, BigQuery or ClickHouse.
• Understanding of SOA, microservices and event-driven architecture.
• Practical experience with AWS and understanding of cloud development principles.
• Experience building and scaling high-load systems with a focus on high availability and reliability.
• Strong analytical and problem-solving skills.

Would be a plus:

• experience with Kotlin.
• Experience with Angular or React.js or Vue.js.
• Experience with Power BI.

We offer:

• the opportunity to share and implement your own ideas that could impact products and production.
• Work with a motivated team and an environment with a zero-bullshit culture.
• Medical insurance.
• Corporate English classes.
• Compensation for professional training.
• The chance to take part in beta testing of Ajax security systems — receive and test new devices before their release.

Ajax Systems is a Ukrainian success story that has grown into a global product. Ajax devices are trusted by more than 4.5 million end users and 330,000 PRO users in over 180 countries. The company provides comprehensive solutions to protect residential and commercial properties of all sizes. Today, Ajax portfolio includes 280 devices for intrusion protection, video surveillance, fire safety, and comfort and automation.

We are looking for an experienced Python Developer to join the project as soon as possible.

Requirements

• 4+ years of experience in a technical role
• Strong Python and FastAPI skills
• Experience with MongoDB Atlas
• Basic AWS knowledge, including Batch, CloudWatch, ECS, and S3
• Linux or macOS as a daily operating system — non-negotiable
• Strong written and spoken English

• Availability to start ASAP

   

Nice to Have

• Experience integrating WhatsApp, SMS services such as Telnyx, and email platforms such as Postmark
• Experience with WebSockets, Server-Sent Events, or HTTP streaming
• Experience building chat applications
• Hands-on experience with LMS integrations, including LTI, OAuth 2.0/OIDC, SAML, REST APIs, and webhooks
• Experience with Canvas, Brightspace/D2L, Moodle, or Blackboard

We're seeking a talented .NET Developer to help shape the future of blockchain technology in innovative startup. If you're ready to make a real impact in a cutting-edge industry, we'd love to hear from you!
 

Core Competence:
 

• At least 2 years of professional experience in software development with a strong foundation in C#, ASP.NET Core, and Entity Framework.
• Proficiency in managing IIS, MS SQL, Visual Studio, and Docker environments.
• Familiarity with ODBC, LINQ, NUnit, xUnit, NuGet, and RESTful APIs, alongside Git for version control.
• Sound understanding of client-side and server-side architectures.
• Strong analytical thinking, with a structured, math or engineering-oriented mindset and a focus on delivering results.
   

Preferred Qualifications:
 

• Knowledge of ReSharper, experience with Azure, and familiarity with NoSQL databases.
• Experience with AWS and Linux system administration is an asset.
• Active participation in hackathons demonstrates innovative thinking and problem-solving skills.
• Upper-intermediate level of English for clear and effective communication in a global team.
   

What We Offer You:
 

• Competitive Compensation: Your skills and experience will be rewarded with a salary aligned with industry standards and your career ambitions.
• Innovative Work Environment: Be part of a forward-thinking FinTech startup with a culture of continuous learning, including tech talks and participation in hackathons.

• 20 paid vacation days, 3 paid sick days, and a flexible schedule for work-life balance.

   

Who are we looking for?

You are the biggest Drupal fan we know. You are contagiously enthusiastic and you never stop learning. You already have experience as a web developer in a web agency. You strive to deliver high-quality projects, on time and within budget.

Experience in Drupal 10 is of great importance. You are excellent with PHP, OOP, SQL & JavaScript. And can dive into version control systems like Git with a big smile!

Bonus points

Do you actively participate in the Drupal Community? Then be sure to let us know :)

Responsibilities:

• following best practices to write well-tested, high-performing code;
• implementing new features and functionality;
• ensuring high performance and availability, and managing all technical aspects of Drupal;
• TeamTechLeading;
• responsibility for products architecture.

We offer:

• competitive compensation depending on experience and skills;
• regular performance review and individual career path;
• sick leave and regular vacation;
• compensation for self-development like English class, gym sessions, etc;
• you get great and experienced colleagues for free!
• challenging full-time job
• flexible working hours policy for a good work-life balance, because we find that extremely important!
• good working conditions: new-built office, cozy chairs, coffee & cookies, hookah area.

Remote collaboration is not considered.

Join Sigma Software’s IT Solutions Department and help shape the internal platforms and automation solutions that support thousands of daily business operations across the company. We are looking for a Principal level engineer who combines deep technical expertise with strong leadership and communication skills.

In this role, you will work in a complex enterprise environment, contributing to scalable Back-end-heavy Full Stack solutions, enterprise integrations, and AI-enabled engineering practices. 

The position combines hands-on development with architectural decision-making, mentoring, and cross-team collaboration.

We at Sigma Software value engineering excellence, continuous improvement, and modern development approaches. You will have the opportunity to influence technical strategy, drive automation initiatives, and help establish responsible AI-assisted development standards across projects.

CUSTOMER

The role is part of Sigma Software’s IT Solutions Department, which is responsible for building and evolving the company’s internal digital ecosystem. The department develops enterprise business applications, automation platforms, integrations, and productivity solutions that improve operational efficiency and employee experience across multiple business domains.

PROJECT

The project focuses on developing and evolving enterprise-scale internal platforms and automation systems used across Sigma Software. The environment includes interconnected services, enterprise integrations, process automation workflows, and AI-assisted engineering practices designed to support operational scalability and business efficiency.

You will contribute to architecture design, implementation of scalable Back-end solutions, enterprise integrations, and AI-enabled capabilities while collaborating closely with multiple technical and business teams.

Key Technologies: JavaScript, Node.js, React.js, REST API, GraphQL, Claude Code, Codex

Job Description

• Collaborate with stakeholders on solution discovery, technical design, estimations, and delivery planning
• Design and implement scalable and maintainable software solutions aligned with business and architectural goals
• Develop production-quality Back-end-focused solutions while contributing across the Full Stack when required
• Own features end-to-end from technical design to deployment and support
• Lead and mentor Middle and Senior engineers through technical guidance and peer reviews
• Act as a key technical point of contact across multiple teams and drive cross-team collaboration
• Design and implement enterprise integrations, automation workflows, and data processing solutions
• Contribute to AI-enabled engineering workflows and product capabilities
• Establish standards for responsible usage of AI coding assistants within the project
• Review AI-generated code for scalability, maintainability, security risks, and edge cases
• Ensure system reliability, scalability, and performance under growing business demands
• Translate business requirements into practical technical solutions delivering measurable value

Qualifications

• 7+ years of commercial software engineering experience with a strong Back-end focus
• Strong hands-on experience with JavaScript and Node.js
• Experience with React.js
• Solid experience designing and developing REST API and/or GraphQL solutions
• Hands-on experience using AI coding assistants such as Claude Code or Codex in daily development workflows
• Strong understanding of software architecture, design patterns, scalability, integrations, and risk management
• Experience working in enterprise environments with multiple stakeholders and distributed teams
• Ability and willingness to lead technical initiatives and mentor engineers
• Strong communication and stakeholder management skills
• Ability to balance technical and business priorities
• Experience working with incomplete or evolving requirements
• Upper-Intermediate English level or higher

WILL BE A PLUS

• Previous formal team leadership experience
• Experience building AI-enabled business solutions
• Experience with enterprise process automation platforms
• Experience defining governance standards for AI-assisted development
• Exposure to complex distributed enterprise systems

PERSONAL PROFILE

• Analytical mindset with strong systems thinking
• High level of ownership and accountability
• Proactive and communicative approach
• Result-oriented mindset focused on measurable outcomes
• Ability to work effectively in complex organizational environments
• Strong balance between technical depth and business understanding
• Comfortable making decisions in ambiguous situations

About your key responsibilities and impact:

• Designing and implementing scalable and efficient software architectures;
• Writing, testing, and debugging complex code for new and existing software applications;
• Providing guidance and mentorship to junior engineers and team members;
• Conducting thorough code reviews to ensure code quality, security, and best practices;
• Creating and maintaining comprehensive technical documentation for software development and system design;
• Leading and managing software development projects, ensuring timely delivery and quality (shared responsibility with the Delivery Manager);
• Working closely with cross-functional teams, including product management, design, and operations, to align development efforts with business goals;
• Researching and implementing new technologies and methodologies to improve software performance and development processes;
• Identifying and resolving complex software issues and technical challenges;
• Driving continuous improvement in software development practices and processes;
• Communicating effectively with stakeholders, including presenting technical concepts and project updates;
• Delivering code to production in a timely manner according to business expectations.

Essential professional experience:

• 5+ years of experience in back end;
• System Design & Architecture – strong experience designing scalable, resilient .NET systems using microservices, event-driven and cloud-native architectures (Azure/AWS);
• Backend Expertise – advanced C# skills, RESTful API development, asynchronous programming, and deep understanding of design and resilience patterns (DDD, CQRS, circuit breaker, etc.);
• Database Mastery – proficiency in SQL optimization, data modeling, indexing, and experience with both relational and NoSQL databases;
• Messaging & Performance – hands-on Kafka expertise, high-load system optimization, caching, and distributed computing;
• DevOps & Cloud – solid experience with CI/CD pipelines, Docker/Kubernetes, and infrastructure automation;
• Quality & Observability – strong focus on testing (xUnit, NUnit), monitoring (Serilog, App Insights), and secure coding practices;
• Leadership & Collaboration – mentoring peers, driving technical decisions, and ensuring engineering excellence within Agile teams;
• Languages – Intermediate+ English, B2+ Ukrainian/Russian

We build a payment-orchestration platform (PSP hub) that connects merchants to dozens of payment providers. You'll join one of two small backend teams (5 developers each — seniors, a Tech Lead, and an Architect) building and maintaining integration services that process real financial transactions in production.

You'll work alongside experienced engineers and strong QA, but we’re looking for someone who can already work independently on well-defined Java backend tasks and take ownership of their code from implementation through testing and review.

• Format: Remote · Full-time
• Level: Junior+ — 1–2 years of recent commercial Java development experience

• English: B1+ (tooling, documentation, and some partner communication are in English)

   

What you'll be working with

• Java 25, Spring Boot, Apache Camel
• REST APIs, SQS, Redis, PostgreSQL
• Cloud & DevOps: AWS, EKS, Terragrunt, Helm, Flux
• Monitoring: OpenSearch, VictoriaMetrics, Grafana

• GitLab & CI/CD

   

What we're looking for — essentials

• 1+ year of recent commercial Java development experience
• Strong Java Core fundamentals and OOP
• Hands-on commercial experience with Spring / Spring Boot
• Practical experience with REST APIs
• Experience working with SQL / PostgreSQL
• Ability to read, understand, debug, and modify an existing Java codebase
• Experience writing unit and/or integration tests
• Understanding of the standard development flow: task → implementation → code review → testing → release
• Ability to work independently on well-defined tasks, ask the right questions, and take ownership of the result

• Good communication and ability to work effectively within a development team

   

Nice to have

• External API / third-party integrations
• Payment / fintech / PSP experience
• Apache Camel
• SQS, RabbitMQ, Kafka or other message queues
• Docker / Kubernetes / Helm
• AWS
• GitLab or other CI/CD tools
• Redis

• Keycloak 26

   

What you'll do

• Build and maintain Java backend services and provider integrations
• Work with and extend an existing production codebase
• Develop and integrate REST APIs and external services
• Write clean, tested, maintainable code
• Debug production issues and improve service stability
• Participate actively in code reviews
• Take ownership of assigned tasks from implementation through testing and release
• Collaborate with Backend, QA, DevOps, Product, and Architecture

How we work / what we offer

• Flexible remote schedule
• Paid sick leave and vacation
• All the equipment you need
• Internal events: open discussions, product meetups, soft-skills training
• Flat structure, no micromanagement, fast decisions

• Experienced engineers around you for code reviews, technical discussions, and mentorship

   

Hiring process

1. Intro call (~30 min)
2. Technical interview
3. Live coding / code-reading & modification session

4. Offer

    

Ready to work on real production systems, take ownership of your code, and grow into a strong Java backend engineer? Join us.

Senior Golang Backend Developer

Location: Remote
Workload: Full-time
Project: Long-term

About the role

We’re looking for a Senior Golang Backend Developer to build and scale microservices-based systems and help the engineering team migrate existing backend services from Node.js/NestJS to Go.

The role involves designing high-load services, working with distributed systems, improving backend architecture, and implementing modern patterns for asynchronous processing and real-time communication.

You’ll work with an existing production codebase, contribute to the migration strategy, and help the team gradually transition services from Node.js to a scalable Go-based architecture.

Requirements

• 4+ years of backend development experience
• 3+ years of hands-on experience with Go / Golang
• Strong understanding of Go fundamentals, concurrency, goroutines, channels, interfaces, contexts, and error handling
• Strong experience with PostgreSQL, MongoDB, and Redis
• Solid understanding of microservices architecture
• Experience building high-load and distributed systems
• Experience with asynchronous processing, queues, and event-driven architectures
• Experience building REST APIs, WebSockets (WS/WSS), and RPC/gRPC services
• Ability to design scalable, maintainable, and reliable backend services
• Ability to read, understand, refactor, and migrate existing codebases
• Strong understanding of performance optimization and observability
• High attention to detail

Nice to have

• Experience with Node.js / NestJS, especially in projects migrating from Node.js to Go
• Previous experience migrating production services between technology stacks
• Deep knowledge of Go concurrency patterns and performance optimization
• Experience with gRPC / Protocol Buffers
• Deep knowledge of Redis, including MULTI/EXEC, data structures, Lua scripts, and Pub/Sub
• Experience with message brokers and event-driven systems
• Experience with Docker, Kubernetes, and cloud environments
• Basic understanding of prompt engineering, AI agents, and AI skills

Responsibilities

• Develop and maintain backend services using Golang
• Design and implement high-load, scalable microservices
• Help the engineering team migrate existing Node.js/NestJS services to Go
• Analyze the existing Node.js architecture and define appropriate Go implementations
• Refactor and gradually replace existing Node.js services while maintaining system stability
• Design APIs and service-to-service communication using REST, WebSockets, RPC/gRPC, and event-driven patterns
• Work with asynchronous architectures, queues, and distributed systems
• Optimize backend performance, reliability, and scalability
• Improve architecture and engineering practices during the migration
• Review code and contribute to technical decisions
• Collaborate with developers and other cross-functional team members

We are looking for an experienced Senior Java Full Stack Engineer to join our development team.
 

Our customer – integrated Shipping Services has set itself apart as an independent carrier with a fresh, unique approach. His strategy as a global niche carrier offers distinctive advantages to customers worldwide. We have created a smart, efficient network that ensures stable, reliable services, and we have made it our mission to focus on the needs of our customers, which stand at the heart of all our decisions. The main idea of our product operates in select trades, where it has a competitive advantage and where it can provide superior service. We maintain a flexible partnership approach with other major carriers, and our new line structure is a much-needed alternative to customers concerned about the current alliance-dominated market.
 

Responsibilities:

• Hands-on full-stack development of innovative applications
• Owning the entire development cycle, including design, architecture, development, and DevOps
• Working in XP with Remote pairing
   

Requirements:

• BS degree in Computer Science or equivalent combination of education and experience
• 5-6+ years of full-stack development
• 5-6+ years of experience in the following technologies: Java, Spring
• Experience with Functional Programming and Java Streams
• 2+ years of experience in front-end development with React
• Experience with developing a reactive UI (Reactive JS)
• 2+ years of experience in TDD/BDD development in the following frameworks: Junit, Jasmin, Mockito, Protractor/Selenium
• 2+ years of experience in micro-services-based architecture and tools (Spring Boot/Cloud)
• Experience in DevOps development and Jenkins
• Experience in development in Kotlin – an advantage
• Experience in designing, developing, and deploying cloud/hybrid-based solutions
• Experience in developing and deploying in container-based environments (Kubernetes, Cloud Foundry)
• Familiarity with the following design concepts: micro-services, service discovery, circuit breaker
• Self-starter with the ability to appropriately prioritize and plan complex work in a rapidly changing environment
• Versatility and the capability to switch easily between different tasks and technologies
• Experience in assessing a broad range of information solutions and products
• Strong critical thinker with problem-solving aptitude
• Good English - verbal and written