Jobs Backend

About Us

We are building a new high-load online platform in the iGaming domain using a modern, cloud-based backend architecture.
Our focus is on performance, reliability, and correctness.

The platform is designed as a distributed microservices system, capable of handling real-time processing, financial transactions, and heavy concurrent workloads.

We are assembling a strong engineering team to design and implement this platform entirely in Python with FastAPI.

Role: Python Backend Developer

You will design and implement core backend services in a cloud-native, microservices architecture.
This role involves working on critical systems such as transactions, user management, game integrations, messaging pipelines, analytics, and internal services.

You will actively participate in architecture, data modeling, and technical decision-making.

Responsibilities

• Design and develop backend services in a microservices architecture
• Build scalable APIs using FastAPI and async Python
• Architect and implement messaging and streaming systems
• Design and optimize PostgreSQL data models and queries
• Implement efficient caching and data access layers
• Work with analytical workloads using ClickHouse
• Ensure high availability, performance, and fault tolerance
• Write production-grade, well-tested, maintainable code
• Participate in system architecture and technical design decisions

Requirements

Must-Have

• Strong experience in Python backend development
• Hands-on experience with FastAPI
• Deep understanding of async programming in Python
• Strong knowledge of PostgreSQL and SQL optimization
• Experience with SQLAlchemy and Pydantic
• Experience working with RabbitMQ and/or Kafka
• Experience with Redis
• Production experience with Docker and Kubernetes
• Understanding of microservices and distributed systems
• Strong debugging and problem-solving skills
• Experience writing automated tests with Pytest

Nice-to-Have

• Experience building high-load, distributed platforms
• Experience in betting, gaming, fintech, or financial platforms
• Experience with ClickHouse or large-scale analytics
• Experience with cloud-native systems and observability

What We Offer

• Work on a new high-load platform built with modern Python
• Real impact on architecture and technical direction
• Challenging engineering problems at scale
• Strong technical team and engineering culture
• Competitive compensation
• Long-term, stable project
• Remote-friendly environment

About us:

We are a team of highly-skilled developers who share a common passion for the work we deliver. Our vision for software development starts with a thorough analyze of our customer's needs that allows us to integrate the functionality of coding into a solid architecture that will ultimately result in business success.

Our developing services are tailor-cut to suit the individual needs of our clients, and we deliver optimal results whether you are a business with ever changing goals or an established company that is looking into a product that can streamline day-to-day operations.

Requirements:

• 5+ years of commercial experience in software development
• Experience of Microsoft 365, SharePoint or Graph is a strong plus
• Basic knowledge and experience with Azure technologies is a plus
• Strong communication English is a must
• Strong desire to learn AI tools is a must
• Solid understanding of OOP/OOD
• Good knowledge of SOLID design principles
• Good knowledge of relational DB concepts
• Solid understanding of our core technologies (C# (.NET Core), REST API’s)
• Basic understanding and experience with Docker is a plus
• Knowledge of Blazor is a plus
• Knowledge of .NET reflection is a plus
• Motivated, determined and independent engineer
• Problem solving skills

• Strong communication skills is a must

   

Work conditions:

• 100% remote work (full time)
• Variety of technology
• Contract work

Code&Care — is a successful full-stack development company, which provides clients with high-quality development assistance worldwide.

Now our team has a position for .NET Developer.

Requirements:

• Strong expertise in the .NET Framework (pre-.NET Core versions)
• Proficiency in Visual Basic .NET (VB.NET) for legacy codebases
• Experience with Windows Forms (WinForms) and/or WPF for UI development
• Familiarity with object-oriented design principles and patterns
• Solid debugging and problem-solving skills

• Upper Intermediate level of English
• Ability to work independently and as part of a cross-functional team

What the company offers:

• Constant and interesting work with foreign clients
• Flexible working hours
• 50% cost compensation of sports, English lessons
• Annual paid 30 days vacation and paid sick days
• Medical insurance policy

Responsibilities:

• Altering and improving ongoing projects
• New products development
• Code documentation

PROJECT: We are building 4connection – a modern, feature-rich messenger combining group messaging, interest-based communities and serious dating/matching features. Think Telegram meets thoughtful matchmaking – with accessibility, youth protection and strong encryption built in from the start. The Rust backend handles message routing, user matching algorithms, group management, API and the web presence. This is a client-commissioned project with a clear product vision.

REQUIREMENTS: 1+ years of experience in C, C++ or another systems-level language. Understanding of memory management (stack vs. heap, pointers, ownership concepts). Basic knowledge of network programming (TCP/IP, WebSockets, HTTP). Interest in learning Rust – we will train you, supported by AI-assisted development with Claude. Clean, readable, maintainable code is non-negotiable. Experience with Git and Linux. Good English skills (reading and writing).

NICE TO HAVE: Any Rust experience (even personal projects). Experience with async programming (Tokio, epoll, io_uring). Experience with matching algorithms or recommendation systems. Knowledge of Firebase integration. Experience with accessibility standards or youth protection regulations.

RESPONSIBILITIES: Implementing the backend architecture under direct guidance of the technical lead. Building message routing, group management and user matching systems. Implementing interest-based and dating match algorithms. Building the persistence layer and REST/WebSocket API. Integrating with Firebase and third-party services. Collaborating closely with Android and iOS developers on API design. Writing testable, documented code that any equivalent specialist can take over immediately.

WE OFFER: Fully remote work. A small, focused core team of 4 developers – no corporate overhead. Direct collaboration with an experienced technical lead who mentors rather than manages. AI-assisted development with Claude as a fixed part of the workflow. The chance to shape a backend architecture from the ground up. Clients will be released as open source – you are building something visible. Fair compensation, long-term collaboration. Nextcloud and Redmine for collaboration – open-source tooling.

Tech Stack: Rust, Tokio, Axum/Actix-Web, Firebase, Linux, Git, Redmine, Nextcloud

Senior Python Engineer (Python + AI/LLM)

Required:

Senior Python Engineer, English B2+

Full-time, US working hours

Project Overview

US-based healthcare platform leveraging AI to optimize doctors' workflows. The team builds intelligent, agent-based systems and integrates LLMs into production environments to improve clinical efficiency at scale.

Responsibilities

Design and develop AI-powered features and backend systems in Python

Build and maintain LLM-based pipelines, RAG systems, and agent-based architectures

Integrate and optimize prompting strategies for production AI workflows

Collaborate with cross-functional teams across product, data, and infrastructure

Ensure code quality, security compliance, and system reliability in a high-security environment

Continuously explore and apply emerging AI frameworks and best practices

Requirements (Must-have)

5+ years of experience - Senior-level Python engineering experience (hands-on, production-grade)

Strong React experience 2+ years

Proactive, self-driven approach with ability to work autonomously

Comfortable operating in high-security environments

English B2+

Nice to Have

Experience with LLMs and agent-based systems (tools/skills, orchestration)

Knowledge of prompting techniques: Zero-shot, Few-shot, CoT, ReAct

Understanding of MCP / context management; experience building RAG or similar systems

Familiarity with LLM evaluation metrics (precision, recall, F1)

Experience with AI frameworks: LangChain, LlamaIndex, AutoGen, CrewAI or similar

Experience with vector databases: Pinecone, Weaviate, FAISS, Chroma, Milvus

Availability in US time zone

Tech Stack

Python, React, LLMs, RAG, Vector Databases, AI Frameworks (LangChain / LlamaIndex / AutoGen)

Hiring Process

Intro call

Technical discussion

Offer

Start: ASAP

• Project Description:

  We are looking for a Senior Data Engineer - Reporting & Process Optimization to support our regulatory reporting transformation initiative within an investment banking environment. The primary focus of this role is to maintain the current reporting system built in Python, while also leading the migration to Azure Databricks to improve performance, scalability, and efficiency.
  
  This role involves developing, optimizing, and automating reporting processes using PySpark and SQL, ensuring accurate and timely regulatory report generation. The successful candidate will work closely with risk teams, regulatory compliance teams, and data engineers to enhance reporting workflows and integrate the new system into our Azure cloud infrastructure.
  
  This is an exciting opportunity to work on critical financial reporting processes, contributing to regulatory compliance, data governance, and process efficiency improvements.

• Responsibilities:

  - drive the modernization and scalability of the client, transaction, and regulatory reporting platforms, within Asset Management technology
  - implement high quality solutions that address business needs and adhere to industry standards
  - drive automation of manual processes to the next level
  - closely collaborate within an agile team and a global agile organization
  - translate high level business requirement into technical requirements addressing reliability, scalability, and performance needs

• Mandatory Skills Description:

  - minimum 4+ years hands-on application development experience using Databricks with Python
  - experience with PySpark, Pandas, Numpy, unit testing
  - hands-On Experience on SQL Server/ PostgreSQL database
  practical experience with microservice architectures, CI/CD pipelines (preferably with GitLab)
  - good to have exposure to cloud native services on Azure
  experience in translating high-level business requirements into IT requirements
  - excellent communication skills

• Nice-to-Have Skills Description:

  - bachelor's/master's degree or equivalent with a focus in software engineering
  - Azure Data Services
  - ETL & Data Processing,
  - Financial Data Processing, experience handling risk, compliance, and regulatory data in an investment banking environment.
  - Data Modeling, meta data management
  - Git, GitHub, GitLab,
  - Jenkins
  - Regulatory compliance knowledge: Basel, MiFID, GDPR
  - Big Data
  - Cloud security and access controls (IAM, RBAC)
  - Familiarity with Docker, Kubernetes, Apache

• Languages:
  • English: C1 Advanced

🔹 Middle Python Developer (Backend)

This is a great opportunity to work with a stable team, contribute directly to product development, and grow professionally while working with modern technologies.

🔧 Responsibilities:

• Develop and maintain backend logic for web applications
• Design, build, and integrate RESTful APIs
• Work with PostgreSQL databases
• Ensure correct processing of static and media files using WhiteNoise
• Implement image manipulation tasks with Pillow
• Write clean, maintainable, and testable code
• Participate in code reviews, refactoring, and optimization

• Collaborate closely with frontend developers, QA, and other team members

   

✅ Requirements:

• 3+ years of commercial experience in software development
• Strong knowledge of Python and Django framework
• Practical experience with PostgreSQL and Docker Compose
• Familiarity with Pillow (image processing) and WhiteNoise (static file serving)
• Solid understanding of software development best practices

• English level B1+ (Intermediate) — ability to communicate within the team and work with technical documentation

   

✨ We Offer:

• Long-term cooperation with a stable product team
• Flexible work schedule and remote work opportunities
• Supportive and open-minded team culture

• Modern technology stack and well-defined processes

   

🛠 Recruitment Process:

1. Recruiter Interview
2. Test Task
3. Technical Interview
4. Offer

Join an amazing team at SerenityGPT led by the creator of Django Ninja. We use Gen AI for chat-with-your-data, customer support, self-service, data extraction, automation and other applications. We are both a product company and a consultancy helping companies with meaninful AI adoption and to become AI-native. More about us at docs.serenitygpt.com

We need a clear communicator who can understand the requirements by working directly with customers and implement them well and fast.

Our stack is Python, SQL, Django, git, docker. We are really AI-native ourselves when it comes to development.

About the Company

We are building AI systems that combine multilayered, scalable knowledge graphs with advanced reasoning agents to analyze and understand highly complex knowledge domains with scholarly precision.

The Role

We are seeking a Senior Backend Engineer with 7+ years of experience to design and scale the backend infrastructure powering our AI platform.

Key Responsibilities

• Architect and implement scalable backend services and multi-tenant SaaS systems
• Design and operate high-throughput data pipelines (batch and streaming)
• Build APIs and services integrating LLM inference, retrieval systems, and knowledge graphs
• Productionize research-grade AI systems into reliable distributed systems

Required Qualifications

• 7+ years of backend engineering experience
• Strong experience with data pipelines and SaaS architectures
• Strong proficiency in Python
• Deep understanding of distributed systems and cloud-native environments
• Experience in architecture, development and deployment of Kubernetes based systems
• Fluent English

Preferred Qualifications

• Go and/or Scala experience
• Hands-on experience with LLM systems (RAG, model serving, evaluation)
• Experience with knowledge graphs, vector databases, or hybrid retrieval architectures
• MS in Computer Science

What We Offer

Technical Innovation: Lead novel neuro-symbolic architectures with cutting-edge research access

Work Environment: Flexible arrangements, international travel opportunities

We’re excited to offer a long-term opportunity for an experienced Back-end Developer (Node.js) to join a team of professional engineers and designers. Together, you’ll be working on a US-based product that’s set to make a significant impact on the PropTech scene. This role offers the chance to contribute to a major market and collaborate with top talent in a dynamic environment.
 

About ElevateOS Product

ElevateOS has been improving the resident experience for over seven years. We created a single, all-in-one platform that makes it easy for property managers and resident staff to work together. Our goal is simple: to provide the best experience for residents by replacing multiple, confusing apps with one easy solution.

This is a stable, long-term project that continues to grow, and you'll have the chance to be part of its ongoing success.

Our primary technology stack revolves around JavaScript. We use React for the front-end, Node.js for the back-end, and React Native for mobile development.

Requirements:

- 4-5+ years of development experience with Node.js;
- Practical knowledge of VanillaJS, Typescript, Express-like framework;
- Hands-on experience creating robust RESTful API’s and designing scalable back-end architecture;
- Proficiency with relational DB;
- Experience with integration with 3rd party REST and SOAP API's;
- Good knowledge of GIT;
- Experience delivering projects, using modern tools like CircleCI, Docker, Kubernetes and navigating through different environments like AWS, GCP.
- Good understanding of ECMAScript specifications;
- Proficient in the English language.

Additional (good-to-have) skills:
- Experience with MySQL, nginx, Stripe, Twilio, Redis
- Experience working in a product company rather than outsourcing.

What will your responsibilities include?
- Creating first-class back-end systems by writing clear, sustainable and well-tested code;
- Improving performance and refactoring existing code;
- Cooperating with the Product, UI/UX, QA and Front-end teams to fulfil project goals;
- Configure project environments and deployment procedures;
- Bugfix during the development process;
- Cover your code with unit tests;
- Write documentation.

We are looking forward to having you on board to contribute to our journey of transforming real estate property management!

Pivdenny Bank is one of the leaders in the Ukrainian financial market and ranks third in the group of Ukrainian private banks in terms of assets. For 32 years, Pivdenny has been a reliable financial partner for individuals, small and medium enterprises, and corporations.

More than 1700 active and dedicated employees work for Pivdenny throughout Ukraine. For four years in a row, the bank has been included in the Forbes 50 Best Employers rating.

We are now looking for a Senior Backend Developer to join our team.

Responsibilities:

• Develop of integration applications on the IBM App Connect Enterprise integration bus in accordance with the current tasks of the department;
• Participate in the design of microservices and their databases;
• Implement unit and integration tests;
• Develop new features and make updates of existent microservices on a daily-basis;
• Write clean, testable, maintainable code, and continue to grow development skills;
• Perform requirement analysis and features estimation;
• Prepare API documentation of microservices;
• Share knowledge of the project with team members.
   

Requirements:

• BS or MS in Computer Science or related field;
• 5+ years of commercial experience in Java;
•  Experience with IBM App Connect Enterprise;
• Good understanding of OOP principles, OOP design, and design patterns;
• Good understanding of microservices architectural principles and experience in the development of RESTful applications and microservices;
• Good practical experience with Java 11+, Spring 5+ / Spring Boot 2+ (Data JPA/Hibernate, Security, Cloud), JUnit 5, Mockito, Testcontainers, Kafka / RabbitMQ;
• Experience with Git, Maven, Docker / Docker compose;
• Good knowledge and practical experience with SQL and relational database.

What we offer:

• Health insurance;
• Competitive salary;
• Work in a functional, comfortable office or remotely;
• Corporate psychologist;
• Opportunity for career growth and development;
• Opportunity to take courses and training;
• Opportunity to work in a stable and professional company with a friendly team.

We review resumes within 14 days. If you do not hear from us, it means that we cannot offer you a position at this time, but we have kept your resume in our database. We will contact you when we have a suitable opportunity.

We are looking for a motivated and ambitious Strong Junior Python Developer who is eager to grow in the field of modern web technologies. You will become part of our team, contribute to interesting and challenging projects, and gain valuable experience under the guidance of senior colleagues.
 

What you’ll be doing:

• Developing new features and modules for our products.
• Participating in the design and maintenance of REST APIs.
• Writing clean, efficient, and testable code.
• Integrating with various external services and databases.
• Participating in code reviews and collaborating with the team.
• Troubleshooting, debugging, and optimizing existing code.

Requirements:

• 6+ months of commercial experience in Python development.
• Knowledge of either Django or FastAPI.
• Hands-on experience with PostgreSQL or MongoDB.
• Solid understanding of REST API design principles.
• Basic knowledge of cloud technologies (AWS or others) is a plus.
• English proficiency at an Upper-Intermediate (B2+) level.

We offer:

• Competitive salary.
• Opportunities for professional and career growth.
• Mentorship and support from experienced developers.
• Work on interesting projects with a modern technology stack.
• Flexible schedule and remote work options.
• Official employment and paid vacation/sick leave.
• Corporate events and a friendly team atmosphere.

TemaBit Fozzy Group is an IT company that develops unique solutions for more than 40 businesses of Fozzy Group. We specialize in web and mobile development, as well as software for managing business processes and infrastructure projects.

In addition, we experiment and care about the team and the Guest, we value cooperation, we preach honesty and openness.

You will play a major role in our engineering team by developing and maintaining high-quality backend systems and applications. Your expertise in .NET and Cloud Native development, coupled with a good understanding of backend architectures, will drive the creation of scalable, efficient, and secure software solutions.

In this role you will also use AI-powered development tools to improve efficiency, code quality, and collaboration throughout the software development lifecycle.

Key Responsibilities:

• Develop backend systems using .NET (with focus on Cloud Native development), ensuring code quality, performance, and scalability
• Collaborate within cross-functional engineering team to design and develop high-quality web applications
• Following engineering best practices
• Participate in the entire software development lifecycle, from concept to deployment
• Contribute to the implementation of scalable and efficient solutions
• Utilize AI-assisted tools (e.g., GitHub Copilot, Amazon Q, ChatGPT) for coding, documentation, and testing to boost productivity and reduce errors
• Stay informed about AI-driven practices and tools relevant to backend development, applying them where appropriate under guidance from senior engineers

Requirements:

• 3+ years of .NET development (Proficiency in .NET 8+)
• Familiarity with AI-powered development tools and willingness to adopt them for improving daily work
• Experience of AWS Cloud Native development, familiarity with AWS services (i.e. Lambda, API Gateway, DynamoDB, S3, ECS, etc.)
• Experience with microservice development
• Knowledge of EF / Dapper
• Understanding of relational and non-relational databases
• Experience with xUnit or similar with testing frameworks
• Experience with containerization (Docker)
• Understanding of Agile/Scrum methodologies and experience working in an Agile environment
• Intermediate/B1 English Level, ability to read & write tech documentation
• Good communication skills

Nice-to-have Skills & Experience:

• Experience with DynamoDB
• Understanding of Infrastructure as Code principle
• Experience building Gitlab CI/CD pipelines
• Basic understanding of cloud-based AI services and how they can be applied in backend solutions

We propose:

• The ability to generate and influence decision-making
• Competitive salary discussed based on the results of the interview with the successful candidate
• Medical insurance
• Discounts for network employees
• Remote work mode, and if you want to work in the office — there is a cozy co-working space in the Silver Breeze business center in Kyiv

Inviting Senior .NET Software Engineer to join a growing account in the medical devices industry domain. Our client is the global leader company of healthcare solutions, which contributes to human welfare by application of biomedical engineering in the research, design, manufacture, and sale of instruments or appliances that alleviate pain, restore health, and extend life for people around the world.

Our team is focusing on designing, developing, and testing embedded software for medical devices, where the software has strong restrictions for safety and quality, power management, and memory usage. Project for this position intends to extend medical device capabilities with PC application that will serve cloud services connectivity for existing device.
 

Requirements

• 4+ years of experience in C# application development
• Experience with AWS / Azure microservices and contenerisation
• Nice to have experience in Windows standalone appplication development
• Services integration experiences
• Upper-Intermediate English (be able to communicate with the client)
• Good communication skills
   

Job responsibilities

• Design and development of standalone application that connects and uses AWS & Azure based services
• Develop AWS services
• Coopeare on architecture design
• Participate in new features implementation
• Communicate with the client

Immediate start!!!

Key Responsibilities

• Migration Projects (Primary Focus):

◦ Lead the migration of critical platforms from PHP 7 to PHP 8.x and from PHP 8.1 to PHP 8.1+

◦ Perform code audits to identify and fix breaking changes (typing, deprecations).

◦ Ensure zero downtime and functional continuity during upgrades.

• Technical Support & Debugging:

◦ Investigate and resolve critical bugs

◦ Manage technical clarifications with external partners (ie. API integrations).

• Maintenance:

◦ Secure and stabilize existing production environments.

Required Skills (Must-Have)

• PHP Expertise: Strong mastery of PHP 7 & 8 (migration experience).

• Debugging: Ability to investigate complex legacy code without up-to-date documentation.

• Database: Proficient in MySQL/PostgreSQL.

• Mindset: Rigorous, autonomous, and focused on stability.

Nice to Have

• Drupal experience

• Experience with Gitlab CI/CD (for testing migrations).

• Familiarity with Symfony or custom legacy frameworks.

• Basic understanding of Node.js, though coding in it is not required