Вакансії Backend Developer

Blackthorn Vision is looking for a Junior Strong/Middle .NET Engineer. Our client, established in 2011 and based in Colorado, is a leading player in the U.S. application management market. We’ve had a successful partnership with this client and are seeking candidates who are eager to take ownership and improve a product already trusted by over 6,000 enterprises.

Requirements:

• 2+ years of commercial experience working on the backend as a .NET developer;
• Cloud systems development experience;
• Understanding of data access technologies, including Entity Framework and MongoDB;
• Experience with NoSQL databases;
• Experience with microservice-oriented architecture, parallel, and asynchronous programming design patterns;
• Experience with Kubernetes, Docker, and RabbitMQ;
• Proven experience with Azure technologies: Azure Entra id, Azure Storage accounts, Azure service bus, Azure container registry;
• Knowledge of design and architectural patterns.

Responsibilities:

• Develop and maintain high-quality software solutions using .NET 8.0;
• Take full ownership of delivering new features to end users, including designing architecture, implementing, testing, and onboarding the customer support team with new functionality;
• Collaborate with product owners, the support team, and end users to understand project requirements and deliver solutions;
• Participate in code reviews to enhance overall code quality;
• Ensure applications are high-performing, responsive, and of excellent quality;
• Troubleshoot and resolve technical issues and defects promptly;
• Create code documentation, technical specifications, and architecture diagrams for new features;
• Follow agile methodologies and participate in regular sprint planning and review meetings.

You are compatible with us if you:

• Have a proactive approach to taking ownership of decisions/features;
• Possess a strong, curiosity-driven mindset;
• Are comfortable with challenges;
• Have the ability to collaborate and build relationships with diverse personalities;
• Demonstrate customer-focused decision-making;
• Exhibit clear and timely communication;
• Are open to giving and receiving constructive feedback;
• Value the quality of your code;
• Are able to solve the required technical tasks and communicate throughout the process (for example, asking clarifying questions promptly).

Join us as a Senior Python Developer and help build a global well-being platform that supports employees worldwide. Work with cutting-edge technologies like Python, AWS, and microservices while solving complex challenges in scalability and performance. Enjoy flexible work options, great benefits, and a supportive environment that fosters professional growth.

About the project

The health app you’ll contribute to is a comprehensive well-being platform designed for companies worldwide. It’s the go-to resource for employees seeking support, guidance, and advice on challenges in their work and personal lives. Whether it’s reading an article on mental health, completing a financial assessment, or connecting with a counselor, the app has you covered.
It also offers fitness tracking, integrations, perks like gift cards, and social recognition features – all aimed at promoting employee well-being and fostering a positive workplace culture.

What we’re looking for

Technical skills matter, but what we value most is a positive attitude and a willingness to learn. Our backend team is looking for people who enjoy solving problems, building new things, and supporting their teammates. Strong communication, teamwork, and a knack for mentoring others are key to helping the whole team grow. If you’re excited about working with new technologies in a collaborative, supportive environment, this could be the perfect fit for you.

Language-specific requirements

• 5+ years of experience as a software developer
• 3+ years of experience with Python
• Experience with a cloud platform such as AWS, Google Cloud, or Azure
• Experience writing tests and knowledge of TDD
• Knowledge of development principles such as OOP and SOLID
• Experience with relational and non-relational databases such as MySQL, Postgres, Mongo, and Dynamo
• Experience with CI/CD platforms such as CircleCI, Travis, GitHub Actions, or ADO
• Experience with static analysis tools like mypy and Radon
• English and Ukrainian languages at Upper Intermediate level or higher

Nice to have:

• Experience with AWS services such as ECS, EKS, Lambda, SQS, SNS, and Event Bridge
• Experience with multiple software development languages, ideally PHP, Node JS, or TypeScript
• Knowledge of Clean Architecture and DDD principles

Ми запрошуємо Senior Node.JS Engineer приєднатися до нашого Retention Acquisition Stream, який працює над високонавантаженими продуктами в рамках CRM (основний продуктовий сервіс), бонусами та новими маркетинговими рішеннями. Також Ви будете брати участь у підтримці існуючих сервісів та розробці нових.

Основні завдання:

• Створення нових функціональних можливостей, інтеграція нових систем та забезпечення відповідності вимогам продукту;
• Оптимізація та покращення існуючого коду відповідно до встановлених рекомендацій, забезпечення стабільності та продуктивності системи;
• Налаштування, оптимізація та моніторинг бази даних PostgreSQL для забезпечення високої продуктивності та надійності;
• Робота з RabbitMQ для забезпечення ефективної обробки повідомлень, вирішення проблем з чергами та повторними спробами;
• Написання та підтримка інтеграційних, модульних та E2E тестів, забезпечення високого тестового покриття, контроль якості коду та участь у процесах CI/CD.

Для нас важливо:

• Від 5 років практичного досвіду роботи з Node.js;
• Від 3 роки досвіду роботи з реляційними базами даних (PostgreSQL);
• Продемонстрований досвід розробки нових функцій та вдосконалення існуючих сервісів;
• Послідовне вдосконалення організації коду та дизайну додатків;
• Здатність наставляти та направляти членів команди;
• Досвід або здібності до прийняття архітектурних рішень та керівництва ініціативами з розробки;
• Сильні організаційні навички та здатність ефективно управляти декількома завданнями;
• Потенціал до лідерства в команді та управлінських обов'язків;
• Досвід вирішення складних проблем та надання ефективних рішень;
• Щонайменше 3 роки досвіду у впровадженні тестів (юніт, інтеграція, E2E);
• Щонайменше 2 роки практичного досвіду роботи з NestJS;
• Вміння налаштовувати та керувати брокерами повідомлень, такими як RabbitMQ;
• Знання механізмів кешування, таких як Redis;
• Знання специфікацій RestAPI та OpenAPI;
• Досвід роботи з Git flow для контролю версій;
• Володіння англійською мовою, зокрема для читання та написання технічної документації (рівень Upper-Intermediate).

We are seeking a skilled and innovative engineer to join our team and drive the advancement of our cutting-edge acceleration technology. In this role, you will play a key part in refining our multi-dimensional indexing implementation for Data Lakehouses, optimizing performance, and enabling next-generation data processing. Collaborating closely with the expert team, you will help develop groundbreaking features that set new industry standards.

Experience / Skills required:

• 5+ years of experience in professional software development
• A Bachelor’s degree in Computer Science or a related field
• Proficiency in Java, Scala, and Rust, with the adaptability to work in other languages as needed
• Experience with query engines like Apache Spark, Trino, or emerging ones like DataFusion
• Strong knowledge of algorithms and data structures.
• Familiarity with database internals
• Upper-Intermediate English and better

Good to have:

• Experience with Data Lakehouse formats (e.g., Delta Lake, Apache Hudi, Apache Iceberg)
• Knowledge of storage I/O

Responsibilities:

• Develop and enhance our indexing technology using Java, Scala, and Rust
• Build support for open table formats such as Iceberg
• Maintain and improve product quality by resolving defects and creating robust test cases and frameworks
• Explore other areas of interest – in a startup, there’s always more to do and learn

Redentu IT company in search of a candidate for the position of PHP (Laravel) Developer. We are looking for a brave superhero, who is ready to fight for the quality and banish a bad code from the Redentu’s universe. With us you will get access to all the necessary resources for work, dynamic development and interesting projects.

Technologies: PHP, Laravel, Symfony.

Requirements:

• Extensive experience with Laravel framework;
• Experience with OOP;
• Experience with source control systems (Git);
• Knowledge of HTML5, CSS3, SCSS; AJAX;
• Teamwork skills;
• Good English;
• More than 2 years of experience.

Will be a plus:

• Experience with highload;
• Experience with big data;
• Vue.js/Angular,js/React.js
• NoSQL, MySQL;
• Redis, Elasticsearch, Rabbit MQ.

About project:

Our client is a Time & Attendance startup. Our system allows us to ensure that employees follow the assigned schedule and track their time when they work out of the office.
Our team has been building the technical part of this product from the very beginning. We have already started working with companies with more than 1000 employees.
We make it easier and faster for HR, Managers, and employees to complete payroll and take the administrative headache so that our customers can focus on running their companies.
Since 2017 thousands of paying customers of all sizes – SMBs, Medium Enterprise & Government, from all the states in Brazil have benefited from the platform, and we’re just getting started.

Responsibilities:

• Extending the functionality of the existing API (Node.js).
• Designing and building new features (most likely on Node.js/Typescript/Nest but technology is negotiable).
• Improving performance and scalability.
• Preparing system for international expansion.

Requirements:

• Experience with Node.js;
• Experience in designing and developing scalable systems;
• Experience in relational databases, ex. PostgreSQL;
• Strong knowledge of JavaScript. Experience with Typescript would be a plus;
• Message brokers;
• Experience with Docker;
• Upper Intermediate English.

‍Nice to have:

• Experience working with Kubernetes;
• GCP, Prometheus, Grafana;
• Experience with writing unit and integration tests with focus on effectiveness and not coverage;
• Experience with non-relational databases: Neo4j, Druid, Kafka, Redis;
• Basic Linux system administration;
• Would be great: Experience with Temporal;
• Experience with CI/CD pipelines, most likely GitHub Actions.

Rakuten Viber is one of the most popular and downloaded apps in the world. Working with us provides a unique opportunity to influence hundreds of millions of our users and to be part of the journey that makes us a super-app. Our mission is to make people’s lives easier by enabling meaningful connections, from precious moments with family and friends, through managing business relationships to pursuing their passions.

Responsibilities:

We are a global team of engineers dedicated to creating the best tools to ensure safe, convenient, and fun communication for millions of users worldwide. Our culture is built on innovation, teamwork, and a commitment to excellence. We offer a unique opportunity to work with cutting-edge technologies, including microservices architecture, and influence the lives of millions of people.
As a Backend Developer at Viber, you will be involved in developing and maintaining high-traffic with over 1 billion messages a day and dozens of scalable services, ensuring the fast and reliable operation of our platform. Your tasks will include developing new features, optimizing performance, ensuring data security, and solving complex technical challenges within our microservices architecture, using a combination of Java, along with non-blocking and reactive approaches, Cloud services, and NoSQL databases.

Requirements:

• 5+ years of experience in server-side development using Java;
• Experience in Java reactive programming (such as Vertx, RX);
• Advanced knowledge of unit testing frameworks and mocking;
• Knowledge of cloud technologies;
• Experience with microservices development based Kubernetes;
• Experience with Agile methodology;
• Striving for new knowledge and skill improvement;
• Intermediate+ in written and spoken English (interviews in English);
• Excellent oral and written communication skills.

Advantages:

• Experience with NoSQL database (such as Couchbase, MongoDB);
• Higher technical education.

We are looking for Senior Python developers. Your mission will be part of the exciting environment and creating new features for the product.

Your future responsibilities:

• Build new features in collaboration with the product team;
• Create new software and application;
• Write reusable, testable, and efficient code;
• Contribute to architecture decisions and communicate openly with other engineers;
• Work collaboratively with a highly talented development team.

Requirements:

• 4+ years of experience with Python (Django, Celery);
• 2+ years of experience with AWS;
• Strong knowledge of DB (PostgreSQL, MySQL);
• Ability to work with distributed systems/databases;
• Experience with building a high-load environment;
• Ability to clearly communicate task statuses and schedules;
• English - no less than upper-intermediate;
• The desire to develop and learn new technologies;
• Natural curiosity - you enjoy digging deeper to find the big picture;
• Humility - you’re able to contribute to the team, ego aside;
• Enthusiasm about helping others, especially team members.

Looking for an experienced Laravel developer for first-party API development and an admin panel on Laravel Backpack. An innovative project utilizing OpenAI APIs for auto-moderation, auto-translation, and more.

Important: The project is urgent. Please realistically assess your availability to complete the tasks on time.

Technology Stack:

• Frontend: Vue.js, Nuxt.js;
• Backend: Laravel (latest version), PHP 8.3;
• Admin Panel: Laravel Backpack;
• Storage: S3 for all uploads (files/images);
• Enviroment: Docker (fully configured; just run make up and follow the readme);
• Database/Queues: MySQL, Redis, Horizon.

Minimum Functionality:

• Registration and Authentication: Email, Google, Facebook.
• User Dashboard: Personal information, Favorites, User messaging.
• Ad Management: Create/Edit ads (paid features will be added later).
• User Messaging System: Direct messaging between users.
• Categories and Filters: Fully managed from the admin panel.
• Geolocation: Ads linked to cities/regions, managed via the admin panel. Uses Google Maps API or similar.
• Automated Moderation: Ads are checked for spam or inappropriate content (text and images) using ChatGPT API.
• Public User Profiles: Accessible to other users.

Additional Functionality:

• Donation system;
• Paid features;
• Blog;
• "Magic Ad Creation" with ChatGPT API: Users enter a few keywords, and the system generates an ad.
• Secure transactions.
• How We Work.
• Task evaluation and breakdown into phases.
• Flexible approach to execution (based on agreements).

Quality Requirements:

We value not just time spent, but also the final outcome. Partially completed work or solutions with errors have no real value, as we pay not only for hours worked but also for your expertise, deep involvement in the project, and high-quality execution. The work must be fully completed and free of critical errors that require rework or fixes.

Requirements:

• Experience: Proven Laravel projects with examples.
• Rate: Specify your hourly rate or project-based rate.
• Availability: Indicate how many hours per week you can dedicate to the project.