Вакансии Backend Developer

We are a Ukrainian outsourcing company Join.To.IT, we have been creating software solutions in various business areas for more than 10 years. Our team consists of experienced professionals who are passionate about their business, share common values and strive for a better result.
If you really love what you do, send your resume and become part of our team.

What to do:

• development of project functionality;
• support existing projects and improve the functionality of existing solutions;
• evaluation of projects;
• сode review.

What you should have:

• 3 + years of development of commercial projects in Python;
• English language proficiency at the level not lower than Upper-Intermediate;
• experience with frameworks: Django, DRF, FastAPI;
• knowledge of databases: Postgres, Redis;
• knowledge of the task manager: Celery;
• experience with Docker, Docker Compose;
• understanding of business processes;
• communication and teamwork skills;
• time management skills;
• desire to develop and learn.

It will be a plus:

• expertise in the AWS cloud platform;
• code testing experience.

We are seeking a Middle Python Engineer to support the development of client applications and backend services for a cutting-edge geospatial system. This role focuses on building the MongoDB + FastAPI backend and integrating it with a JavaScript-based frontend derived from Figma designs. The ideal candidate is a hands-on developer with experience in building robust APIs, managing databases and collaborating with front-end developers.

Customer Overview:

Our client was founded in 2017 as a drone services provider specializing in precision agriculture. Upon returning to La Junta, Colorado, they reconnected with their community and identified the challenges faced by local farmers. Combining their strengths and experiences, they developed systems to support small and midsize farms. Initially, our client used drones and imagery to deliver field data, enabling farmers to make faster decisions. Their rural Colorado roots have provided a unique perspective, allowing them to grow and learn alongside the farming community.

Technology stack: Python, Flask/Django, MongoDB.

Responsibilities:

• Backend Development:
  • Develop RESTful APIs using FastAPI to support client-side functionality.
  • Implement CRUD operations for geospatial data stored in MongoDB.
  • Optimize database queries and ensure data integrity and consistency.
• Frontend Integration:
  • Collaborate with frontend developers to integrate APIs with the UI.
  • Ensure seamless communication between the client app and backend services.
  • Provide backend support for dynamic content rendering in the front end.
• Performance Optimization:
  • Identify bottlenecks in the backend system and optimize for performance and scalability.
  • Implement caching strategies (e.g., Redis) to enhance data retrieval speed.
• Testing and Debugging:
  • Write unit tests for backend code to ensure high-quality and bug-free implementations.
  • Debug and resolve issues in backend systems promptly.
  • Document API endpoints, database schema, and workflows for use by the development team and stakeholders.

Skills/Requirements:

• Backend Development:
  • Proficiency in Python, with hands-on experience in FastAPI (or similar frameworks like Flask/Django).
  • Experience in designing and implementing RESTful APIs.
  • Strong understanding of MongoDB and NoSQL database principles.
  • Experience in managing database schemas, indexes, and migrations.
  • Understanding of caching mechanisms like Redis.
  • Experience with database performance optimization.
  • Knowledge of testing frameworks (e.g., Pytest) to ensure robust code quality.
• General Skills:
  • Problem-solving mindset with a proactive approach to identifying and resolving issues.
  • Ability to collaborate effectively with cross-functional teams, including frontend developers and UI/UX designers.
  • Strong written and verbal communication skills.
  • Experience with containerized deployments (e.g., Docker).
• Education and Experience:
  • Bachelor’s degree in Computer Science, Software Engineering, or a related field (or equivalent work experience).
  • 2-4 years of experience in Python development, with a focus on building APIs and database-driven applications.

We are building a web application for data analytics for the hospitality industry. The system will aggregate data from multiple hotel management platforms, analyze it, and provide actionable insights to help hotel owners make informed decisions to increase revenue. The application will have a modular architecture to integrate various third-party APIs (REST, SOAP, etc.) and a full-stack setup with front and backend components.

What will be your work focus:

• Develop and maintain a web application capable of collecting, processing, and analyzing data from multiple sources.
• Implement ETL processes to automate the collection and transformation of large datasets.
• Design and implement scalable and modular architecture for integrating various external APIs.
• Replace and improve existing semi-manual processes (currently handled through large spreadsheets) with a fully automated web solution.
• Collaborate with the product owner and other stakeholders to understand and refine business logic and requirements.
• Write clean, efficient, and well-documented code.

Our perfect-match teammate should have:

• Senior-level expertise in software development with proven experience in designing and delivering complex systems.
• Strong experience with Node.js for backend development.
• Hands-on experience in ETL processes and data pipeline automation.
• Proven track record of digitizing and automating business processes, especially migrating from spreadsheet-based workflows to web applications.
• Experience working with external APIs (REST, SOAP, etc.), including integrating multiple third-party systems.
• Ability to develop systems for data aggregation and analysis at scale.
• Attention to detail and a strong focus on delivering high-quality solutions.
• Excellent communication skills and conversational English to work directly with a product owner and other stakeholders.
• A desire to deeply understand business logic and provide solutions that align with user needs.

Nice to Have:

• Experience with front-end development or full-stack architecture.
• Familiarity with analytics or reporting systems.
• Knowledge of best practices in building secure and scalable web applications.

We are looking for a Middle Java Engineer for PitchBook.

About the role

Join our team focused on developing and maintaining systems that manage and analyze funds, including mutual funds, exchange-traded funds (ETFs), and other investment instruments. The team ensures accurate data handling, and efficient fund allocation processes, and supports investors in making informed decisions. In this role, you’ll build new service functionality and optimize complex, actively used applications and services.
PitchBook is an analytical platform designed for investment professionals. It aggregates data from various sources, presenting it in a user-friendly manner. The platform is invaluable to anyone operating in the financial market – whether it’s startups, large corporations, venture capital and private equity firms, investment banks, market analysts, or others. Our Engineering team is continuously growing and enhancing our technical landscape. We’ve completed the migration to Kubernetes in production and are now focusing on optimizing its use and adopting new managed services. From a process perspective, we’re finalizing the transition to Team Topologies and a Scrum-based Agile framework, empowering our teams to become more autonomous. We’re also fostering a strong One-Team mentality across the organization.

As a qualified expert, You will:

• Write well-designed, testable code.
• Collaborate within the team and across teams to achieve sprint goals.
• Document and maintain software functionality.
• Troubleshoot, debug, and upgrade existing systems.
• Adhere to project plans, industry standards, and company/team guidelines.
• Be a domain expert incertain parts of the product/services under your ownership.

We’re looking for you if you have

• 3+ years of experience in Java development.
• Strong knowledge of Java Core, Java 11/Java 17.
• Experience with Spring Framework and Spring Boot.
• Strong understanding of object-oriented programming and design patterns.
• Familiarity with RESTful API design and development.
• Proficiency in working with relational databases (e.g., PostgreSQL, MySQL).
• Hands-on experience with Kubernetes (K8s) for container orchestration.
• Experience with message brokers such as RabbitMQ or Kafka.
• Knowledge of version control systems, such as Git.
• Good problem-solving skills and attention to detail.
• Strong communication and teamwork abilities.
• English – Intermediate (B1 and above), Ukrainian – fluent (both spoken and written).

Bonus Points

• Experience with ElasticSearch or Lucene
• Experience with OpenAPI.

Scrum-based Agile methodology. Flexible schedule. The team is required to attend scrum events. The time zone is Europe/Kyiv.

Our client is an early-stage technology start-up with a mission to help customers operationalize their customer identity data. Their platform is a sophisticated indexing system powered by machine learning, improving the reliability and value of consumer identity sources while reducing the long-term cost of data ownership. Led by a seasoned founding team, the company is backed by Tier-1 investors, with a proven track record of success and a recently raised $6.5M Seed Round.

Project Description:

The project is focused on deploying and integrating a cutting-edge AI/ML-powered customer identity product for large enterprise customers. The role requires expertise in building scalable web services, integrating complex systems, and ensuring seamless data processing across customer systems of record and consumer touchpoints.

What You'll Do:

• Assess customers' existing technology and system designs to identify opportunities for improvement using the platform;
• Design and build scalable web services to ingest and process data between customer systems of record and consumer touchpoints;
• Develop APIs that are intuitive and easy to use for both internal and external consumers;
• Reverse engineer existing customer solutions and implement necessary improvements to support product deployment;
• Own the deployment and operation of services, ensuring their successful transition to production;
• Collaborate with the product engineering team to align the roadmap with customer needs;
• Evaluate and select technologies to support enterprise customer requirements;
• Leverage agile methodologies to deliver value quickly and efficiently;
• Help recruit, interview, and mentor software engineers as the team scales;
• Monitor and optimize performance to ensure high-quality, highly available services.

Job Requirements:

• 8+ years of relevant industry experience;
• Proficient in modern J2EE frameworks, such as Spring Boot, with hands-on experience in CI/CD technologies;
• Proven ability to write high-quality, well-tested code using industry best practices;
• Experience with test automation frameworks to ensure reliability in a CI/CD environment;
• Strong experience with relational databases, NoSQL data stores, and message queues;
• Working knowledge of cloud-native architectures and at least one major cloud provider;
• Experience with containerization technologies, such as Kubernetes and Docker;
• Good communication skills with the ability to work effectively with internal teams and external customers;
• Flexible and adaptable, with a startup mentality and willingness to pivot direction as needed;
• Strong presence, entrepreneurial mindset, and a positive, can-do attitude;
• English proficiency at B1 or higher.

Our client is a global leader in flexible advertising solutions, providing advertisers, agencies, publishers, and broadcasters with advanced tools to utilize data and TV advertising effectively. Their unified technology stack includes a demand-side platform (DSP), supply-side platform (SSP), and a robust data platform at its core. With a commitment to customer-centricity, curiosity, and collaboration, the company is transforming advertising through creative and flexible solutions.

Project Description:

The project is focused on building next-generation data privacy and governance services, ensuring compliance with global ad-tech regulations like CCPA and GDPR. The role involves designing and implementing a privacy-focused API layer, integrating OneTrust into backend systems, and enabling actionable insights for compliance.

What You'll Do:

• Develop and maintain scalable Node.js applications focused on privacy and data governance;
• Design and implement web APIs to integrate OneTrust into backend systems;
• Collaborate with cross-functional teams to align on privacy requirements and deliverables;
• Work with relational databases like MySQL to store and manage privacy-related data;
• Implement queueing and messaging systems such as Kafka to support data flows;
• Ensure backend infrastructure reliability and scalability within Kubernetes environments;
• Monitor and troubleshoot performance issues to maintain system efficiency;
• Stay updated on evolving privacy regulations and technologies to adapt solutions as needed;
• Collaborate with US-based partners, with occasional evening calls required.

Job Requirements:

• 3+ years of programming experience with a strong background in Node.js development (Nest.js experience preferred);
• Proven expertise in building and working with web APIs;
• Hands-on experience with relational databases like MySQL;
• Familiarity with queueing and messaging systems such as Kafka;
• Knowledge of containerized environments and orchestration tools, particularly Kubernetes;
• Fluent conversational English at B1 or higher for effective team communication;
• Proactive and collaborative mindset, ready to tackle complex privacy challenges in the ad-tech domain.

We are looking for a Middle Back-End Developer (Node.js) to join an exciting music tech project that transforms moments into lasting memories by combining music, technology, and innovation. The platform empowers DJs to craft perfect playlists and simplifies event planning for clients, impacting thousands of users daily.
As part of the team, you’ll contribute to a product that redefines event planning, working alongside experienced professionals to solve real-world challenges and create seamless, reliable solutions that impacts thousands of users daily.

Responsibilities:

• Developing new backend features, fixing bugs, maintaining of the existing platform.
• Participating in new features designing.
• Participating in team meetings.
• Supporting project infrastructure (codebase, database).
• Support and enhance project infrastructure, including the codebase and databases.
• Collaborate with team members to solve complex challenges and deliver exceptional results.

Requirements:

• A minimum of 2.5 years of experience in backend development with Node.js.
• Proficiency in Express.js, MongoDB, and Git.
• Experience with AWS, Firebase, or GraphQL.
• Proficiency Git/Bitbucket and team-based workflows.
• A problem-solving mindset and passion for clean, efficient code.
• Understanding of algorithms, data structures, and SOLID principles.
• Upper-Intermediate English proficiency.
• Ability to create and use technical documentation effectively.
• Strong result-oriented attitude with a focus on product strategic goals.
• Collaboration skills to thrive in a fast-paced, team-oriented environment.

Nice to have:

• Bonus points for experience in ElectronJS.

Про клієнта та проєкт:

Країна: Ізраїль.
Проєкт – платіжна платформа для надсилання та отримання різноманітних платежів (SWIFT, SEPA, crypto, тощо) з високими безпековими вимогами.

Обов'язки на проєкті:

• Участь в активній розробці платформи, впровадження нового функціоналу;
• Рефакторінг поточного функціоналу;
• Баг фіксинг;
• Участь в скрам процесі.

Основні вимоги:

• 5+ років досвіду роботи з PHP та Symfony;
• Знання та досвід роботи з HTML, CSS, JavaScript;
• Досвід роботи з реляційними та нереляційними базами даних;
• Досвід роботи з платіжними системами;
• Відмінні знання всього циклу розробки програмного забезпечення;
• Технічна освіта;
• Рівень англійської: Upper-Intermediate (та вище);
• Особисті якості: самостійність, проактивність, комунікабельність.

Буде плюсом:

• Досвід роботи з React.js або іншими фронтенд бібліотеками.

We are looking for a .NET Software Engineer to join our team and help us drive digital transformation in the construction and real estate industries.

Responsibilities:

• Develop and optimize back-end solutions using C# and ASP.NET WebAPI.
• Design and implement robust APIs for our platform.
• Ensure code quality through unit and integration tests.
• Participate in software architecture design and develop sustainable technical concepts.
• Utilize modern technologies like Docker, Kubernetes, and MongoDB.
• Collaborate closely with an agile development team to deliver high-quality solutions.

Requirements:

• 3+ years of experience in back-end development, ideally with C# and ASP.NET;
• Strong knowledge of API design and testing (unit and integration);
• Experience in software architecture and agile methodologies, such as TDD;
• Familiarity with Docker and Kubernetes is a plus;
• Knowledge of MongoDB or similar NoSQL databases;
• English – Upper-Intermediate.

Personal profile:

• Proactive, self-motivated, and willing to take responsibility and initiative;
• Innovative mindset with a passion for working in a motivated team environment;
• Enjoys solving challenges and contributing to a growing company.