Backend Engineer (Python / IIoT)

🏢 Summary: The offer is for a Python Backend Engineer to build and maintain scalable backend services and REST APIs in a collaborative product environment. The role focuses on developing clean, well-tested code and contributing to architecture and code quality from day one. It is a fully remote position with flexible contract options and long-term international projects. 🗂️ Requirements: 3+ years of professional Python experience, Strong knowledge of FastAPI, Django, or Flask, Experience with PostgreSQL, Experience with REST API design, Proficiency with Git, Experience with pytest, Experience with CI/CD workflows 📃 Skills: Python, FastAPI, Django, Flask, PostgreSQL, REST, Git, pytest, CI/CD, AWS, GCP, Azure, Docker, Kubernetes, Kafka, Redis, RabbitMQ, Poetry, uv 🏢 Description: About the role We're looking for a Python backend engineer to join a client team and build reliable, scalable services from day one. Responsibilities Design and maintain Python-based backend services and REST APIs Write clean, tested, well-documented code Collaborate with product and DevOps teams on feature delivery Participate in code reviews and architecture discussions Requirements 3+ years of professional Python experience Solid knowledge of FastAPI, Django, or Flask Experience with PostgreSQL and RESTful API design Comfortable with Git, pytest, and CI/CD workflows Good written and spoken English Nice to have AWS, GCP, or Azure Docker / Kubernetes Kafka, Redis, or RabbitMQ Poetry or uv for dependency management pre-commit hooks and code quality tooling We offer B2B contract or employment contract (umowa o pracę / umowa zlecenie) — flexible on the form Fully remote, flexible setup Long-term engagements with international clients Dedicated recruiter support through onboarding

🏢 Summary: B2B contract for a Mid/Senior Backend Engineer starting mid-April, fully remote, working directly with the end client. The role focuses on backend development in one of two tracks: Python with strong database optimization expertise or automated search testing with TypeScript. Solid backend fundamentals are required for both profiles. 🗂️ Requirements: Mid/Senior level backend experience, Strong Python knowledge (first profile), Experience with databases and data sources, Hands-on database indexing, Query optimization skills, Experience in automated search testing (second profile), TypeScript knowledge (second profile), Solid backend fundamentals 📃 Skills: Python, TypeScript, SQL, Databases, Indexing, QueryOptimization, SearchTesting, Backend 🏢 Description: We are looking for a Backend Engineer (Mid/Senior) for a B2B contract starting around mid-April. The role is fully remote and involves working directly with the end client. We are currently recruiting for two backend profiles: The first is a Backend Engineer with strong knowledge of Python and experience working with databases and data sources, including hands-on experience with database indexing and query optimization. The second profile is a Backend Engineer with experience in automated search testing and knowledge of TypeScript. Both roles require solid backend fundamentals.

🏢 Summary: Senior Backend Python Engineer role focused on building scalable AI-powered enterprise software and owning backend services from architecture to production. The position involves backend development, distributed systems, cloud infrastructure, and technical leadership in a hybrid B2B environment. Candidates will collaborate across teams to deliver secure, high-performance applications using modern engineering and AI-assisted workflows. 🗂️ Requirements: 6+ years building production-grade backend systems, Strong Python experience, Experience with distributed systems, Knowledge of concurrency and asynchronous processing, Experience designing REST APIs, Experience with scalable architectures, Hands-on cloud platform experience, Database design and performance optimization knowledge, Experience building secure enterprise applications, Ability to own projects from design to deployment, Cross-functional collaboration skills, Strong troubleshooting and problem-solving skills, Excellent English communication skills, Experience with AI tooling and automation workflows 📃 Skills: Python, REST, AWS, GCP, Azure, SQL, TypeScript, LLM, AI, Monitoring, Logging, Observability, Automation 🏢 Description: Senior Backend Engineer (Python) 📍 Warsaw, Poland (Hybrid) ☑️ Full-time 🕦 B2B Contract 💰 $8.000 - $12.000/month We are hiring a Senior Backend Python Engineer for an innovative technology company building AI-powered enterprise software used by organizations worldwide. This role is ideal for an experienced backend engineer who enjoys designing scalable production systems, solving complex technical challenges, and taking ownership of critical backend services from architecture through production. You'll work closely with product, frontend, and platform engineers to build reliable, secure, and high-performance applications while leveraging modern AI-assisted engineering practices . As a Senior Backend Python Engineer you will provide backend development, system design, cloud infrastructure, and technical leadership in a fast-paced engineering environment where ownership and continuous improvement are highly valued. Requirements 6+ years of experience building and maintaining production-grade backend systems Strong hands-on experience with Python and modern backend development practices Strong understanding of distributed systems, concurrency, asynchronous processing, and scalable architectures Experience designing and developing REST APIs and backend services Hands-on experience with cloud platforms such as AWS, GCP, or Azure Strong knowledge of database design, performance optimization, and high-throughput applications Experience building secure, reliable enterprise applications with a security-first mindset Ability to own projects from technical design through deployment and production support Experience working closely with cross-functional engineering and product teams Strong troubleshooting, problem-solving, and communication skills Excellent written and verbal English communication skills Improve engineering leverage with AI tooling , automation, and internal workflows rather than using AI as a gimmick Nice to Have Experience building AI-powered applications, agentic systems, LLM integrations, or orchestration frameworks Experience with TypeScript or full-stack development Experience mentoring engineers or contributing to technical leadership Experience with observability, monitoring, logging, and performance optimization Experience working in fast-growing product or startup environments Responsibilities Design, develop, and maintain scalable backend services, APIs, and asynchronous processing systems Translate business requirements into robust technical solutions and scalable system designs Own services throughout their lifecycle, including deployment, monitoring, reliability, and continuous improvement Design efficient data models and optimize database performance for production workloads Collaborate with product, frontend, and platform teams to deliver end-to-end features Improve engineering productivity through automation and AI-assisted development workflows Participate in architecture discussions, code reviews, and technical decision-making Implement monitoring, logging, and observability solutions to ensure production reliability Continuously improve system scalability, performance, security, and maintainability Contribute to engineering best practices and knowledge sharing across the team

🏢 Summary: Backend Developer role in a global digital asset trading firm, working remotely on live production trading systems and infrastructure. The position focuses on backend services, exchange integrations, real-time market data processing, and reliability improvements within a small, highly technical team. It offers direct impact on trading operations and close collaboration with trading infrastructure in a crypto-focused environment. 🗂️ Requirements: Degree in Computer Science, Electrical Engineering, Software Engineering or related field, Hands-on experience with Python, C++ or another backend/systems language, Understanding of APIs, integrations and production systems, Experience with Linux and debugging, Strong problem-solving skills, Interest in trading systems, financial markets or crypto infrastructure, Very good English proficiency 📃 Skills: Python, C++, REST, WebSocket, Linux, Docker, SQL, PostgreSQL, Redis, Kafka, ClickHouse, APIs, Networking, Concurrency, Algorithms 🏢 Description: Location: 100% remote from Poland Contract: B2B Budget: 10,700–21,400 PLN net + VAT / month Seniority: Junior+ / Mid Industry: digital assets / trading systems We are supporting a global digital asset trading firm in hiring a Backend Developer to join a small, highly technical engineering team working on live production trading systems. You will be working close to trading infrastructure, exchange connectivity, real-time data, reliability, and internal tools used in a production trading environment. The company operates internationally and is now expanding its presence in Poland. What you will work on Depending on your experience and strengths, you may be involved in: building and improving backend services supporting trading operations, integrating with external APIs and crypto exchanges, working with REST / WebSocket APIs, processing real-time market data, improving reliability of production systems, debugging issues in live trading infrastructure, building internal tools and automation for trading operations, collaborating closely with a small technical team. What we are looking for We are looking for someone with strong backend or systems engineering foundations who enjoys solving technical problems and wants to work closer to trading infrastructure. You may be a good fit if you have: a degree in Computer Science, Electrical Engineering, Software Engineering or a closely related technical field , hands-on experience with Python good understanding of APIs, integrations and production systems, experience with Linux and debugging technical issues, strong problem-solving skills and ability to explain your thinking clearly, interest in trading systems, financial markets, crypto infrastructure or real-time systems, very good English - the recruitment process and daily cooperation are in English . Nice to have Any of the following would be a strong plus: experience with trading systems, market data, order books or exchange connectivity, experience with crypto, blockchain, DeFi, market-making, arbitrage or digital assets, experience with WebSocket APIs and real-time data flows, experience with low-latency, high-throughput or performance-sensitive systems, knowledge of algorithms, data structures, concurrency, networking or distributed systems, experience with Docker, SQL, PostgreSQL, Redis, Kafka, ClickHouse or similar technologies. Why this role may be interesting 100% remote setup, B2B cooperation, direct impact on live production trading systems, small technical team with strong ownership, opportunity to work close to crypto trading infrastructure, practical engineering work, not only feature delivery, environment where problem-solving, technical clarity and ownership matter. Sounds interesting? Apply and share your CV. We will contact selected candidates with more details about the company, role and next steps.

🏢 Summary: Full-time B2B opportunity for a Middle Python Engineer to build scalable backend systems and AI infrastructure for enterprise applications in a hybrid Warsaw setup. The role involves developing REST APIs, distributed systems, and cloud-based services while owning features through the full software lifecycle. Candidates will work in an AI-native environment focused on production-ready enterprise AI solutions. 🗂️ Requirements: 3-5 years commercial experience as Backend Engineer, Strong Python programming skills, Understanding of distributed systems, Experience with AWS, GCP, or Azure, Strong knowledge of SQL databases, Strong knowledge of NoSQL databases, Experience designing and supporting production-grade systems, Experience with full software lifecycle ownership, Ability to develop scalable backend services and REST APIs, Comfortable working in AI-native engineering environments 📃 Skills: Python, AWS, GCP, Azure, SQL, NoSQL, REST, TypeScript 🏢 Description: Python Engineer 💰 Salary: 5000-7000$ 🌎 Warsaw, Hybrid (1 day remote per week) 🕦 Full-time ☑️ B2B Contract We’re looking for a Middle Python Engineer for our client, which is an AI infrastructure company that helps large enterprises safely and effectively adopt AI in their daily operations. Rather than building general-purpose AI, our client creates a platform that connects AI to a company's internal knowledge, policies, workflows, and business rules. This enables AI to provide accurate answers and automate complex business processes instead of relying on generic responses or potentially inaccurate information. Their customers include well-known enterprise organizations such as Glovo, Nespresso, and HelloFresh, where AI is used to improve internal operations, customer support, and business efficiency. The company operates in the rapidly growing field of Agentic AI, focusing on building reliable, production-ready AI systems for enterprise environments. Requirements: 3-5 years of commercial experience as a Backend Engineer developing production-grade systems. Strong Python programming skills, with the ability to write clean, maintainable, and well-structured backend code. Good understanding of distributed systems. Hands-on experience with cloud platforms, such as AWS, GCP, or Azure. Strong knowledge of SQL and NoSQL databases, including schema and data model design. Experience owning features throughout the full software lifecycle, from design and implementation to deployment, monitoring, and production support. Comfortable working in an AI-native engineering environment. Nice to have: Exposure to agentic systems: AI agents, tool-calling, orchestration, retrieval, or LLM-backed infrastructure Working knowledge of TypeScript Responsibilities: Design, develop, and maintain scalable backend services, REST APIs, data pipelines, and background processing systems. Translate business and product requirements into technical solutions, evaluating architecture, trade-offs, and implementation approaches. Own features end-to-end, from technical design and development through deployment, monitoring, and ongoing production support. Build reliable, secure, and high-performance backend systems that support enterprise AI applications. Design efficient interfaces, data models, and service architectures that integrate seamlessly within the broader platform. Monitor, troubleshoot, and improve system reliability, observability, scalability, and performance in production environments. Collaborate closely with Product Managers, Frontend Engineers, and Platform/Infrastructure teams to deliver end-to-end product features. Write clear technical documentation, design notes, and architecture diagrams to support collaboration and knowledge sharing. Leverage AI-powered development tools to improve engineering productivity, automate repetitive tasks, and streamline development workflows. Participate in code reviews and design reviews, ensuring high engineering standards, maintainable code, and best practices.

🏢 Summary: Full-time remote Backend Engineer role focused on building and enhancing secure PHP-based APIs for an open-source cybersecurity product. The position involves developing new features, maintaining code quality, implementing tests, and ensuring high standards of security, performance, and data integrity. The engineer will work on cryptographic mechanisms, access control, and secure API workflows used at scale. 🗂️ Requirements: 3+ years experience building PHP applications, Proficiency in CakePHP, Laravel or Symfony, Experience with PHPUnit testing, Knowledge of OpenAPI specifications, Experience with Git and branching models, Understanding of OWASP Top 10 and secure coding practices, Proficiency in at least one additional language: JavaScript, Bash, Python, Go or Rust, Experience building and maintaining secure APIs, Ability to write unit and end-to-end tests, Experience with CI/CD pipelines 📃 Skills: PHP, CakePHP, Laravel, Symfony, PHPUnit, OpenAPI, Git, OWASP, JavaScript, Bash, Python, Go, Rust, CICD, APIs, GDPR 🏢 Description: 💰 Salary: 4000 - 4500 EUR, depending on experience 🕦 Full-time ☑️ EOR 🌴 Remote We are looking for a Backend Engineer  to join a fast-growing open-source cybersecurity company's engineering team. The role focuses on building and improving secure APIs, handling data integrity, access rights management, and cryptographic mechanisms while maintaining high standards of performance, quality, and security across all product editions. Requirements 3+ years of experience building PHP applications Proficient in building back-end applications with CakePHP, Laravel, or Symfony Proficient in testing applications with PHPUnit Familiar with OpenAPI Specifications Familiar with Git and branching models Strong understanding of OWASP Top 10 vulnerabilities and secure coding practices Proficient with at least one additional programming language: JavaScript, Bash, Python, Go, or Rust Fluent in English, both verbal and written Key Responsibilities Develop new features in PHP and CakePHP for existing products used daily by over half a million users Maintain, improve, and fix bugs on the existing codebase Transform functional specifications into reliable API workflows, ensuring backward compatibility and security Participate in code reviews to identify defects before launch Write unit tests aiming for 80% coverage to ensure functionality and prevent regressions Develop end-to-end tests to ensure critical user journeys function correctly across various scenarios Optimize code for performance and scalability to handle growth and increased demand Contribute to OpenAPI specifications, SDKs, and user and admin guides Collaborate closely with SRE teams to maintain robust CI/CD pipelines Apply secure coding and design practices to ensure all components adhere to the highest security standards Monitor project dependencies for vulnerabilities and assist the security team in analyzing their impact Ensure data handled by the product development team complies with GDPR and other data protection regulations Get to know DevsData: We are a technology consulting company and a recruitment agency, delivering software solutions to clients from Europe and the US. We work 100% remotely, in an international team, including people from Asia, London, or San Francisco. We employ people with experience in international corporations as well as students of the best technical and business universities. Find out more: https://devsdata.com/

🏢 Summary: Backend Python Developer role focused on building and optimizing internal tooling that automates satellite testing and space-to-ground interface processes. The position involves developing CI/CD pipelines, supporting satellite testing campaigns, and deploying and monitoring backend systems in Linux-based environments. The role combines backend development with automation, containerization, and database management. 🗂️ Requirements: Minimum 2 years of experience in application development, Bachelor’s degree in Computer Science or related field or equivalent experience, Proficiency in Python, Experience with Git, Experience with CI/CD methodologies, Experience with relational databases, Knowledge of PostgreSQL, Knowledge of TimescaleDB, Experience with Docker, Comfortable working in Linux environment 📃 Skills: Python, Git, CI/CD, PostgreSQL, TimescaleDB, Docker, Linux, SQL, Backend 🏢 Description: We’re looking for a Backend Python developer interested in optimizing our internal Python tooling, which automates the processes of defining space-to-ground interfaces between Creotech’s satellites and Mission Control. Responsibilities Build tooling for satellite testing & operations; Automate testing, validation & build processes using CI/CD Participate in satellite testing campaigns in our satellite laboratory and remote locations (all the way to the SpaceX integration facility); Write clean, efficient, well-documented and testable code; Employ version control tools (e.g., Git) and containerization technologies (e.g., Docker) to ensure robust and scalable development workflows; Manage software engineering fundamentals, including documentation, version control, and team collaboration; Identify and resolve bugs and issues; Deploy and monitor developed systems. Qualification Minimum of 2 years of experience in application development; Bachelor’s degree in Computer Science or a related field or equivalent experience. Experienced with Git Experienced CI/CD methodology; Proficient in Python and familiar with other backend technologies. Experienced with relational databases (PostgreSQL, TimescaleDB) Familiar with containerization (Docker). Comfortable working in a Linux environment. Proficiency in English. Nice to have Familiarity with DevOps practices and infrastructure as code (e.g., Terraform, Ansible). Familiarity with aerospace industry and standards (e.g. UAV protocols, CCSDS, ECSS). Knowledge of cloud platforms such as AWS, Azure, or GCP. We offer Work in a friendly, well-coordinated team of enthusiasts Stable employment in a modern company with an established market position Attractive salary and benefits package (e.g., private medical care, sports card) Opportunities for professional development and participation in innovative projects

🏢 Summary: Hybrid Python Engineer role focused on building automated tools for detecting vulnerabilities in modern web applications and enhancing security testing at scale. The position involves developing Python-based systems, integrating AI/ML (including LLMs and RAG), and improving the security and performance of internal platforms. Offered on an employment contract with a monthly salary of 15,000–19,000 PLN gross. 🗂️ Requirements: 3+ years of Python development experience, Strong knowledge of web technologies (HTTP, APIs, web architecture, REST), Experience in automation and building internal tools or scripts, Practical knowledge of AI/ML concepts including LLM and RAG, Understanding of web application security fundamentals, Ability to write clean, maintainable, production-quality code 📃 Skills: Python, HTTP, APIs, REST, AI, ML, LLM, RAG, Automation, Web, Security 🏢 Description: For our Client we are looking for a Python Engineer. Warsaw, hybrid (3 days per week from the office) UoP(Umowa o prace): 15 000- 19 000pln/month brutto Key Responsibilities Design and develop automated tools for detecting vulnerabilities in modern web applications. Build scalable solutions to support continuous, large-scale security testing across internal platforms. Develop and maintain Python-based systems for web data processing, automation, and security analysis. Integrate AI/ML capabilities (including LLMs) into existing tools to enhance vulnerability detection and analysis. Work directly on improving the security of web applications and identifying real vulnerabilities. Optimize performance, accuracy, and reliability of internally developed solutions. Requirements 3+ years of experience in Python development. Strong understanding of web technologies (HTTP, APIs, web architecture, REST). Experience in automation and building internal tools or scripts. Practical knowledge of AI/ML concepts, including LLM and RAG approaches and ability to integrate them into applications. Understanding of web application security fundamentals. Ability to write clean, maintainable, and production-quality code.

🏢 Summary: B2B contract for a Senior Python Backend Developer to design, build, and maintain scalable backend systems in a fully remote environment (Poland-based). The role focuses on developing production-grade services and APIs using Python and FastAPI, with end-to-end ownership of features. You will contribute to microservices architecture and asynchronous processing solutions. 🗂️ Requirements: Minimum 5 years of commercial experience, Strong experience with Python, Strong experience with FastAPI, Experience building backend systems and APIs, Experience with RESTful services, Experience with microservices architecture, Experience with messaging or queue systems, Hands-on experience in production environments, Ability to work independently, Ability to manage tasks end-to-end 📃 Skills: Python, FastAPI, REST, Microservices, API, Queues, Messaging, Async, Backend 🏢 Description: Location: 100% Remote (candidates must be located in Poland) Start Date: ASAP /  2 weeks Contract Type: B2B via Experis About the Role We are looking for an experienced Python Backend Developer to join our team and contribute to building and maintaining scalable backend systems. You will work on production-grade solutions and take ownership of features end-to-end. Key Responsibilities Design and develop backend services using Python and FastAPI Build and maintain REST APIs and microservices architectures Work with queues and asynchronous processing Support and improve production systems Take ownership of tasks from concept to delivery (end-to-end) Collaborate with cross-functional teams in a fully remote setup Requirements Minimum 5 years of experience Strong experience with Python and FastAPI (mandatory) Proven track record in building backend systems and APIs Experience with RESTful services, microservices, and messaging/queue systems Hands-on experience working on production environments Ability to work independently and manage tasks end-to-end Strong problem-solving and communication skills What We Offer Access to Medicover healthcare Multisport card E-learning platform access Group life insurance

🏢 Summary: Senior Backend Developer role focused on designing and delivering scalable server-side applications and APIs using Python and Django for early-stage B2B SaaS products. The position involves architectural ownership, system reliability, and performance optimization in a fully remote, full-time setup. The developer will drive backend best practices, testing, and CI/CD processes. 🗂️ Requirements: 5+ years of backend development experience, Extensive experience with Python, Extensive experience with Django, Proficiency in data modelling, Experience with relational databases, Experience with non-relational databases, Ability to write complex SQL queries, Experience with API design, Experience with system integrations, Experience with distributed systems (synchronous and asynchronous), Hands-on experience with Docker, Hands-on experience with Redis, Experience with message brokers, Experience with cron jobs, Experience writing unit tests (e.g. Pytest), Strong understanding of code quality and testing best practices, Good command of English for technical communication 📃 Skills: Python, Django, SQL, Docker, Redis, Pytest, APIs, Databases, PostgreSQL, MongoDB, CI/CD, MessageBroker, Cron, Git 🏢 Description: Senior Backend Developer (Python/Django; 100% remote) 💰 Salary: 23,400-25,500 PLN/month 🌎 100% Remote 🕦 Full-time position ☑️ B2B or Contract of Employment We are looking for a Senior Backend Developer for a partner client with a compelling mission: they act as a product and technology partner for early-stage B2B SaaS founders, helping them navigate the crucial journey from launch to their first million in revenue. They essentially become the dedicated tech backbone for these startups. Requirements: 5+ years of professional backend development experience. Extensive, proven experience with Python and the Django framework. Proficient in data modelling, relational and non-relational databases, and complex SQL queries. Strong experience with API design, integrations, and distributed systems (synchronous & asynchronous communication). Hands-on experience with Docker, Redis, message brokers, and cron jobs. Expertise in writing unit tests (e.g., Pytest) and a commitment to code quality and testing best practices. Great understanding of English with strong communication and collaboration skills. Nice to have: Previous experience in Greentech or Ecotech is a significant plus. Experience as an unofficial tech lead or mentoring junior developers. Knowledge of additional testing methodologies (integration, end-to-end). Responsibilities: Lead the design and development of complex server-side applications, APIs, and databases, taking ownership of architectural decisions. Architect, write, and deliver high-quality, scalable, and efficient code using Python and Django. Collaborate closely with cross-functional teams, including front-end developers and the tech lead, to align backend development with project goals. Architect and implement advanced user authentication, authorisation, and security mechanisms. Conduct performance analysis and optimisation, identifying bottlenecks and implementing solutions. Drive the implementation of automated testing and CI/CD processes to ensure code reliability. Establish and enforce coding standards, conduct thorough code reviews, and document backend architecture and APIs. Take responsibility for system reliability, scalability, and security, ensuring best practices. Get to know DevsData We are a technology consulting company and a recruitment agency, delivering software solutions to clients from Europe and the US. We work 100% remotely, in an international team, including people from Asia, London, or San Francisco. We employ people with experience in international corporations as well as students of the best technical and business universities. Find out more: https://devsdata.com