Senior Project Manager (Customer Success; 100% remote)

🏢 Summary: Full-time, 100% remote Senior Frontend Developer role focused on building and scaling complex, responsive web applications powered by AI-driven platforms. The position involves architecting high-quality front-end solutions, integrating with back-end services, and ensuring performance, scalability, and cross-browser compatibility. The role also includes driving best practices, code quality, and modern front-end standards within the team. 🗂️ Requirements: Strong knowledge of HTML5, CSS3, JavaScript (ES6), Strong understanding of DOM, Experience with React.js, Experience with Material UI, Experience with Responsive Design and cross-browser compatibility, Familiarity with SASS or LESS, Understanding of BEM methodology, Knowledge of CSS-in-JS, Knowledge of browser storage (cookies, localStorage, sessionStorage), Proficiency with npm or yarn, Experience with Jest or equivalent testing frameworks, Understanding of SEO best practices, Familiarity with TypeScript, Knowledge of SSR and service workers, Experience with Webpack, Vite, or Rollup, Understanding of browser extensions integration 📃 Skills: HTML5, CSS3, JavaScript, ES6, DOM, React, MaterialUI, SASS, LESS, BEM, CSS-in-JS, cookies, localStorage, sessionStorage, npm, yarn, Jest, TypeScript, SSR, Webpack, Vite, Rollup, SEO, ServiceWorkers 🏢 Description: Senior Frontend Developer (100% remote) 💰 Salary: 20,000-23,000 PLN/month 🌎 100% Remote 🕦 Full-time position ☑️ B2B or Contract of Employment We are looking for a Senior Frontend Developer for a partner client that helps businesses use artificial intelligence to run more efficiently and grow faster. The company builds and provides digital platforms and consulting services that enable organizations to manage operations, analyze data, and improve performance. Their solutions combine AI, automation, and deep business expertise to help clients simplify workflows, gain insights, and deliver greater value. Requirements: HTML5 , CSS3 , JavaScript (ES6) Strong understanding of the Document Object Model (DOM) Skilled in Responsive Design and cross-browser compatibility Experience with React.js and Material UI Familiarity with CSS preprocessors such as SASS or LESS Understanding of BEM methodology and CSS-in-JS approaches Knowledge of browser storage mechanisms (cookies, localStorage, sessionStorage) Proficient in using package managers (npm/yarn) Experience in unit testing using Jest or equivalent frameworks Understanding of SEO best practices Familiarity with TypeScript for type-safe, large-scale applications Knowledge of server-side rendering (SSR) and service workers Experience with code bundling and modern module bundlers (e.g., Webpack, Vite, Rollup) Understanding of browser extensions and their integration with web applications Responsibilities: Develop and maintain  complex, responsive user interfaces for large-scale web applications. Architect and integrate front-end components with back-end APIs and services , ensuring security, scalability, and performance. Drive the implementation of pixel-perfect UI/UX designs across browsers and devices. Provide technical mentorship to junior developers and guide the team in adopting modern best practices. Conduct code reviews , enforce standards, and maintain a clean, modular codebase. Evaluate and recommend new frameworks, tools, and libraries to enhance productivity. Manage project timelines, estimate development efforts, and collaborate effectively with cross-functional teams. Maintain comprehensive front-end documentation , design patterns, and style guides. Stay updated with industry trends , emerging technologies, and front-end innovations to continuously improve team capabilities. Participate in architectural discussions , ensuring long-term scalability and maintainability of the front-end ecosystem. 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: 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

🏢 Summary: Senior Product Manager role responsible for defining and executing the strategic roadmap of a SaaS platform and shared services in a fully remote environment (Poland-based). The position focuses on leading product initiatives across identity, eventing, messaging, and integration domains within a modern software architecture. The role oversees the full product lifecycle, ensuring high-quality delivery and continuous platform improvement. 🗂️ Requirements: Proven Product Owner or Product Management experience in Agile environments, Experience with SaaS platforms and shared services, Strong knowledge of identity management systems, Experience with monitoring and observability solutions, Hands-on understanding of eventing frameworks (e.g., Kafka, Confluent, CQRS), Experience with messaging and notification systems, Experience designing and managing APIs and system integrations 📃 Skills: SaaS, Agile, ProductManagement, Identity, Monitoring, Observability, Kafka, Confluent, CQRS, Messaging, Eventing, APIs, Integrations, Platform, SharedServices 🏢 Description: Senior Product Manager Location: 100% remote – but you need to be based in Poland Salary: Up to 25,000 PLN Company: Work for a leader in the SaaS industry, specializing in software solutions for insurance companies. About the Role: We are looking for a highly skilled Senior Product Manager to join our team. In this role, you will be in charge of Strategic Direction: The Senior Product Manager is responsible for defining and executing product initiatives within a dynamic software environment, ensuring our solutions continue to lead the market. Key Responsibilities: Drive the strategic direction, product vision, and roadmap for our SaaS platform and shared services. Act as a bridge between business stakeholders and engineering teams, translating complex requirements into actionable product features. Oversee the entire product lifecycle from ideation to launch, ensuring timely delivery and high-quality outcomes. Monitor product performance, user engagement, and market trends to continuously iterate and improve our offerings. Collaborate with cross-functional teams to align product strategies with the company’s goals. Requirements: Solid history of Product Owner roles and/or Product Management experience in agile environments. SaaS Platform / Shared Services history – ideally with strong knowledge and experience in: Identity management Monitoring & observability Eventing frameworks (Kafka, Confluent, CQRS, Message Hub, etc.) Messaging & notifications API & Integrations Insurance background is a plus but not a hard requirement. Exceptional communication and leadership skills with the ability to manage complex stakeholder relationships. Fluent English (both written and spoken). What We Offer: Competitive salary up to 25,000 PLN. 100% fully remote work environment (based in Poland). The opportunity to work for an established leader in the SaaS/insurance tech industry. A dynamic, innovative environment where your strategic decisions shape the future of our software solutions. If you are a driven product professional with a passion for platform services and modern software architectures, we encourage you to apply!

🏢 Summary: B2B contract role for a Senior Project Manager with a strong technical background to lead complex eCommerce projects using Agile methodologies. The position focuses on delivering re-platforming and software development initiatives on time and within budget while managing multiple workstreams and stakeholders. The role requires ownership of scope, release processes, and financial control within a retail eCommerce environment. 🗂️ Requirements: Proven experience in software development project management, Experience managing eCommerce projects in retail environment, Experience delivering re-platforming projects and cutover processes, Strong knowledge of SDLC and release management, Proven scope control in project delivery, Experience managing multiple workstreams and interdependencies, Strong Agile delivery knowledge, Experience managing project budgets and financial reporting, Relevant Project Management qualification, Fluent English communication skills 📃 Skills: Agile, Scrum, SDLC, Release, eCommerce, Retail, Replatforming, Budgeting, Reporting, StakeholderManagement, ProjectManagement 🏢 Description: Senior Project Manager with a technical background required to join our eCommerce Team on a contract basis. An experienced Project Manager who leads teams to deliver high quality, complex projects on budget and within a specified timeframe to achieve the potential benefits defined in the business case. You will work closely with the Programme Manager/Account Director to achieve productivity goals and contribute to the organisation’s overall success. Please note that this job is a B2B contract position located in Poland. Please send us your CV in English. What you’ll be doing Effectively run complex projects using Agile methodologies Support the efficient flow of work by providing solutions to issues and blockers Produce accurate status reporting regarding project milestones, deliverables, risks, and issues communicating to various audiences including key stakeholders and sponsors Manage several workstreams successfully, ensuring the teams understand what is expected of them in terms of output and quality Manage the interdependencies between the various workstreams Inspire and lead teams with little Agile experience, suggesting process and practical improvements as appropriate Motivate teams to achieve individual and team objectives, to deliver high quality outputs within agreed timeframes Focus on improving delivery processes Provide support to Junior Project Managers within your account Review and update the project resource plan on a regular basis, keeping tight control of project budgets Foster close relationships with senior management and business stakeholders, be seen as a credible, reliable expert Develop customer confidence by understanding their needs and delivering first class solutions Set and manage client expectations, including resolving client escalations with diplomacy Chair meetings/reviews with multiple stakeholder requirements Keep up to date with emerging industry practices What we want from you Proven software development Project Management experience, eCommerce experience ideally within a retail environment Proven experience managing re-platforming Projects and owning the cutover process Proven experience of scope control within project delivery Proven experience working on eCommerce platform projects, delivering change to external stakeholders A good understanding of the software development lifecycle and release management Ability to define, manage and deliver to customer expectations within strict deadlines Ability to deal with ambiguity, embrace and react to change with enthusiasm and critical thinking Experience of leading and managing teams at different stages of the team’s lifecycle Experience of modern software development practices Strong understanding of agile delivery techniques and lean ways of working Experience of managing people and financial budgets (including project budgeting, monitoring financials, reporting etc) Solid time management & organisational skills Excellent negotiation skills and an ability to handle sensitive issues with tact and diplomacy Relevant Project Management qualifications Excellent verbal and written communication skills in English

🏢 Summary: Full-time Senior Software Engineer role focused on designing and delivering scalable features and integrations for a renewable energy platform. The position involves building and maintaining large-scale systems, contributing to greenfield products, and supporting production services in a hybrid Warsaw setup. The goal is to enhance performance and automation in solar project development through robust software solutions. 🗂️ Requirements: 5+ years of software development experience, Proficiency in at least two production programming languages, Strong computer science fundamentals, Experience building and maintaining large-scale systems, Ability to work in remote or hybrid teams, Fluent English (spoken and written) 📃 Skills: Python, Java, Go, C++, JavaScript, TypeScript, Spring, Jackson, JPA, HTTP, SQL, MySQL, MariaDB, Git, Gradle, AWS, DDD 🏢 Description: Senior Software Engineer 💰 Salary: 14,000-28,000 PLN 🌎 Hybrid from Warsaw 🕦 Full-time position, long-term ☑️ Contract through Deel The company develops software that helps businesses plan and manage renewable energy projects more efficiently. Its technology platform uses data and automation to simplify complex workflows, enabling teams to design, evaluate, and deliver energy solutions at scale. The overall goal is to make clean energy projects easier to develop and deploy. Requirements: At least 5+ years of experience in software development Strong proficiency in at least two production programming languages (ideally Python and Java), though any combination of languages is acceptable Good engineering judgment based on solid computer science knowledge Experience working with teams to build and maintain large-scale systems Strong communication and collaboration skills, especially when working in remote or hybrid teams Comfortable adapting to changes in a growing product and evolving technology stack, with the ability to make practical decisions and support the team as things scale Fluent in spoken and written English (please submit your resume in English) Nice to Have: Interest in renewable energy and sustainability Experience applying Domain-Driven Design (DDD) principles Experience developing production software in at least one additional language besides Java (such as Python, Go, C++, JavaScript, or TypeScript) Familiarity with technologies such as Spring Framework, Jackson, JPA, HTTP, SQL (MySQL/MariaDB), Git, Gradle, and AWS Key Responsibilities: Design and deliver new features that improve the performance and accuracy of the platform Build integrations with key partners across the solar ecosystem to simplify end-to-end project workflows Develop new capabilities for our industry-leading solar design platform Lead the creation of new greenfield products that influence how solar systems are designed and implemented Take ownership of the services managed by your team, including participating in an on-call rotation for operational support 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: Remote Senior Security DevOps Engineer role in a fintech company building a high-traffic digital trading and investment platform. The position focuses on securing cloud infrastructure, Kubernetes environments, and CI/CD pipelines while implementing strong IAM, network security, and Security as Code practices. This is a full-time B2B contract role with a competitive monthly salary. 🗂️ Requirements: 8+ years of experience in DevOps, Cloud Security, or Site Reliability Engineering, Experience with high-traffic or regulated environments, Strong knowledge of cloud identity systems and authentication protocols, Advanced knowledge of Kubernetes security and cluster hardening, Hands-on experience with Infrastructure as Code tools, Strong understanding of Linux security mechanisms, Knowledge of networking fundamentals (TCP/IP, DNS, TLS), Experience implementing security automation in CI/CD pipelines 📃 Skills: Kubernetes, Terraform, Ansible, Linux, TCP/IP, DNS, TLS, CI/CD, IAM, RBAC, ABAC, MFA, SSO, OIDC, SAML, PKI, SOC2, ISO27001 🏢 Description: Senior Security DevOps Engineer (100% remote) 💰 Salary: 7000-8000 USD/Month 💻 100% remote 🕦 Full-time ☑️ B2B We’re looking for a Senior Security DevOps Engineer to join a fast-growing fintech company that builds a digital trading and investment platform. Requirements: 8+ years of experience in DevOps, Cloud Security, Site Reliability Engineering, or similar roles. Experience working with high-traffic systems or regulated environments, such as financial platforms or other compliance-driven industries. Strong understanding of cloud identity systems and modern authentication protocols. Advanced knowledge of Kubernetes security, container orchestration, and cluster hardening. Hands-on experience with Infrastructure as Code tools such as Terraform or Ansible. Solid understanding of Linux security mechanisms and networking fundamentals, including TCP/IP, DNS, and TLS. Experience implementing security automation within CI/CD pipelines. Nice to Have: Experience supporting security or financial compliance frameworks (e.g., SOC 2, ISO 27001, or similar). Background in cryptography concepts, including encryption standards or PKI management. Experience with resilience or security testing approaches, such as controlled failure or attack simulations. Key Responsibilities: Design and maintain secure identity and access management (IAM) strategies across cloud infrastructure, Kubernetes clusters, and internal platforms using RBAC and ABAC models. Implement privileged access management solutions to enable secure, temporary access to production environments while eliminating long-lived credentials. Enforce strong authentication and identity policies, including MFA, SSO integrations, and modern identity standards such as OIDC and SAML. Secure containerized environments by implementing Kubernetes security best practices, including network policies, workload isolation, and secure container lifecycle management. Develop and maintain network security architecture, including segmentation strategies, firewall configurations, and protection mechanisms for high-throughput APIs. Manage the lifecycle of secrets and sensitive credentials, ensuring secure storage, rotation, and access control across environments. Integrate security scanning and testing tools into CI/CD pipelines to detect vulnerabilities during development and deployment stages. Integrate security monitoring with observability tools to detect anomalies, threats, or unauthorized access attempts in real time. Promote Security as Code practices by automating security policies, checks, and infrastructure configurations. 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: Senior Project Manager role focused on leading complex SAP and data center migration projects. The position involves end-to-end ownership of planning, execution, risk management, and stakeholder coordination to ensure successful project delivery. The role requires extensive experience in managing dependencies and delivering structured project reporting. 🗂️ Requirements: 10+ years of project management experience, Proven experience in SAP project management, Experience leading data center migration projects, Strong project planning and scheduling skills, Experience managing stakeholders and communication, Expertise in dependency management, Expertise in risk management and mitigation, Ability to prepare and deliver project reports, Fluent English (B2/C1 level) 📃 Skills: SAP, DataCenter, Migration, ProjectManagement, Scheduling, RiskManagement, StakeholderManagement, Reporting, Agile, English 🏢 Description: Introduction & Summary: We are seeking an experienced Senior Project Manager specializing in SAP and data center migrations. The ideal candidate will have over 10 years of project management experience, demonstrating expert knowledge in managing complex dependencies and ensuring project goals are met efficiently and effectively. What we offer : B2B Contract Rate: 140 pln/h + VAT 4 days from office and 1 day from home Main Responsibilities: Oversee all aspects of the data center migration project. Facilitate stakeholder alignment and communication. Manage project dependencies effectively. Identify and mitigate risks and issues proactively. Handle escalations with strategic solutions. Deliver comprehensive project reports. Prepare detailed project plans and schedules. Define project tasks and track progress closely. Key Requirements: 10+ years of project management experience. Proficient in SAP project management. Strong skills in project planning and execution. Experience in managing stakeholder communications. Expertise in dependency and risk management. Ability to deliver timely and accurate project reports. Excellent problem-solving and decision-making skills. Fluent in English (B2/C1 level). Nice to Have: Experience with specific data center technology. Familiarity with agile project management methodologies.

🏢 Summary: Senior Project Manager role focused on leading SAP-driven data center migration projects, ensuring successful delivery through effective planning, risk management, and stakeholder coordination. The position involves overseeing complex project dependencies, managing escalations, and delivering comprehensive project documentation and reports. 🗂️ Requirements: 10+ years of project management experience, Proven experience in SAP project management, Experience leading data center migration projects, Strong project planning and scheduling skills, Expertise in dependency and risk management, Experience in stakeholder communication management, Ability to prepare and deliver detailed project reports, Fluent English (B2/C1 level) 📃 Skills: SAP, ProjectManagement, DataCenter, Migration, Planning, Scheduling, RiskManagement, StakeholderManagement, Reporting, English 🏢 Description: Introduction & Summary: We are seeking an experienced Senior Project Manager specializing in SAP and data center migrations. The ideal candidate will have over 10 years of project management experience, demonstrating expert knowledge in managing complex dependencies and ensuring project goals are met efficiently and effectively. What we offer : B2B Contract Rate: 140 pln/h + VAT 4 days from office and 1 day from home Main Responsibilities: Oversee all aspects of the data center migration project. Facilitate stakeholder alignment and communication. Manage project dependencies effectively. Identify and mitigate risks and issues proactively. Handle escalations with strategic solutions. Deliver comprehensive project reports. Prepare detailed project plans and schedules. Define project tasks and track progress closely. Key Requirements: 10+ years of project management experience. Proficient in SAP project management. Strong skills in project planning and execution. Experience in managing stakeholder communications. Expertise in dependency and risk management. Ability to deliver timely and accurate project reports. Excellent problem-solving and decision-making skills. Fluent in English (B2/C1 level). Nice to Have: Experience with specific data center technology. Familiarity with agile project management methodologies.

🏢 Summary: Remote Senior Engineering Manager role based in Warsaw focused on leading complex IT product delivery, managing technical teams, and driving digital transformation initiatives. The position requires strong experience in software development, Agile delivery, and leadership within modern engineering environments. 🗂️ Requirements: 5+ years of experience in software development and team management, Experience with Java, Experience with Angular, Knowledge of Agile methodologies, Experience with project management tools, Experience managing the software delivery lifecycle, Knowledge of risk management and process improvement, Understanding of software testing and quality assurance, Leadership and team management skills, Good command of Polish, Communicative English, Legal right to work in the European Union 📃 Skills: Java, Angular, Agile, Scrum, AI, Claude, Copilot, SQL, Testing, QA 🏢 Description: Hook – one bold sentence Empower digital transformation through strategic leadership and innovative engineering management in a dynamic, fast-paced environment. Location & Work Model Warszawa-based opportunity with remote work (5 days per week). As a Senior Engineering Manager, you will be working for our client, a globally recognized IT organization dedicated to delivering cutting-edge digital solutions. You will lead impactful product delivery initiatives, oversee talented technical teams, and foster a culture of continuous improvement. Join us to shape the future of technology and drive strategic projects that push the boundaries of innovation. Your main responsibilities: Lead and coordinate the delivery process of complex IT products, ensuring timely and high-quality outputs. Collaborate with Product Owners, Solution Architects, and Release Managers to develop and execute comprehensive project roadmaps. Monitor progress against KPIs, manage risks, and implement corrective actions to guarantee project success. Facilitate agile practices within teams, encouraging continuous improvement and lean methodologies. Support backlog management, sprint planning, and execution of strategic initiatives. Drive technical discussions, understanding architecture and code to effectively communicate with development teams. Foster a high-performance culture by motivating, developing, and nurturing autonomous teams of experts. Ensure compliance with organizational standards, policies, and best practices in software development. You're ideal for this role if you have: Minimum 5 years of experience in software development and team management. Proven expertise in Java and Angular technologies. Strong knowledge of Agile methodologies and project management tools. Experience managing the entire software delivery lifecycle, including risk management and process improvement. Good understanding of software testing techniques and quality assurance practices. Excellent leadership skills — inspiring teams, promoting autonomy, and fostering professional growth. It is a strong plus if you have: (optional) Experience working with AI technologies (e.g., Claude, Copilot, or similar). Knowledge of asynchronous communication, database management, and application architecture. Certifications in Agile, Scrum, or project management frameworks. Fluency in Polish and good command of English. Language Required for the role: Polish (good command level) English (communicative proficiency) Eligibility to work on this role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Full-time Senior Back-End Engineer (Node.js) role focused on designing and maintaining scalable, high-performance server-side applications and APIs for modern, data-driven platforms. The position involves building RESTful services, integrating with third-party systems, ensuring code quality through testing, and optimizing system reliability and performance. Hybrid work model in Warsaw with B2B or CoE contract options. 🗂️ Requirements: Strong experience with Node.js, Strong experience with Express.js, Experience building and integrating APIs (GraphQL or REST), Knowledge of OAuth, JWT, and session-based authentication, Experience with MySQL, Experience with PostgreSQL, Experience writing unit tests with Chai and Mocha, Experience using Git and version control systems 📃 Skills: Node.js, Express.js, GraphQL, REST, OAuth, JWT, MySQL, PostgreSQL, Chai, Mocha, Git 🏢 Description: Senior Back-End Engineer (Node.js) 💰 Salary: 18,700-20,900 PLN/Month 💻 Warsaw, Poland (Hybrid - 3 days in office, 2 days remote) 🕦 Full-time ☑️ B2B or CoE We’re looking for a Senior Back-End Engineer to join a fast-growing international tech company focused on building modern, data-driven platforms that power digital transformation in the financial and enterprise sectors. Requirements: Strong experience in building server-side applications using Node.js and Express.js. Hands-on experience with API development and integration, particularly with GraphQL or RESTful services. Strong knowledge of authentication and authorization mechanisms (OAuth, JWT, session-based). Strong experience with databases such as MySQL and  PostgreSQL. Experience writing unit tests with tools such as Chai and Mocha. Strong experience using Git and version control systems. Proficiency in English (both written and spoken). Nice To have: Bachelor’s degree in Computer Science or a related field. Experience with cloud platforms (AWS, Azure, or GCP), as well as containerization and orchestration tools such as Docker and Kubernetes. Experience with microservices architecture. Experience setting up CI for static analysis and test execution. Experience developing RAG applications and storing data in vector embeddings. Key Responsibilities: Design, build, and maintain scalable, high-performance server-side applications and RESTful APIs using Node.js and Express.js. Guide and supervise the development of key code components to ensure long-term reliability and scalability. Integrate with front-end components and third-party services. Actively review the codebase, recommending and implementing refinements where needed. Write unit and integration tests and optimize performance to ensure high-quality code. Collaborate closely with cross-functional teams to define and implement technical solutions. Improve system performance, reliability, and long-term maintainability through optimization and 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/