backend developer English-speaking jobs in Kielce

Perform manual penetration tests of various systems and applications to discover and exploit vulnerabilities. Consult, design, and execute adversary simulation scenarios. Report findings using a standardized structure.

Mid-Senior Front-End Developer needed to build and maintain responsive UI components using modern JavaScript frameworks and Bootstrap. Translate product and design requirements into scalable front-end solutions within CMS-driven environments. Collaborate with product, design, and backend teams to deliver intuitive user experiences. 3+ years of experience with Bootstrap, modern JavaScript frameworks, and responsive design required. English proficiency at B2 level or higher.

Azure Data Engineer needed to design, architect, and implement modern, secure, cloud-native data platforms on Azure. Requires 8+ years of IT experience, deep Azure knowledge, and expertise in IaC, containerization, CI/CD, and Python. Experience with data processing and orchestration tools, testing, and security best practices is essential.

SAP CPQ Business Analyst to define, develop, and maintain the Clarity/SAP CPQ solution. Requires 3+ years of experience as a Business Analyst, fluency in English, and strong SAP CPQ scripting and rule engine knowledge.

Senior Cloud Engineer will maintain cloud infrastructure in GCP and AWS, help migrate products, develop internal tools, and provide support to developers. Requires production experience with cloud infrastructure engineering, Kubernetes, and proficiency in Terraform, Ansible, Linux, networking, and containerization. Experience with Python or Go is also required.

Lead frontend engineering at Umbrel, owning product surfaces in umbrelOS, apps, and the website. Develop polished, accessible interfaces using React + TypeScript, Tailwind, Shadcn, and Radix. Focus on user experience, including empty states, error handling, and microcopy. Collaborate with design, write clear code, and ship iteratively.

Lead Accountant with German fluency required for full accounting cycle management of SPVs. Responsibilities include preparing financial statements, maintaining GL entries, and supporting tax and audit processes. Requires 3+ years of accounting experience, advanced accounting knowledge, and a Bachelor's degree in accounting or related field.

Develop and enforce information security strategy, policies, and operations across the company. Manage IAM, endpoint protection, security operations, and IT infrastructure. Collaborate with leadership and IT teams to ensure resilience against evolving threats and compliance with data protection requirements.

Senior Backend Engineer with 5+ years of Java development experience using Spring, Hibernate, and other open-source frameworks. Develop scalable applications, contribute to product design, and collaborate in a team environment.

The Privacy Product Analyst will troubleshoot issues, assist teams with privacy tech configuration, and manage user access requests. Responsibilities include configuring OneTrust modules, updating geolocation rules, and providing guidance on cookie consent implementation.

Operates the "CISO Release Management" service, ensuring best practices for smooth transitions into production. Identifies, collects, and bundles CISO change items, verifying compatibility and assessing impact. Builds and maintains release plans, performs quality assessments, and monitors risks associated with non-compliance to the SDLC. Provides support when SDLC IT controls fail and reinforces the usage of good release practices. Drives initiatives to address identified gaps within the domain, ensuring alignment with organizational standards.

Senior Full Stack Software Engineer will design, build, and maintain end-to-end solutions using modern full-stack technologies. Responsibilities include developing and integrating with the Shopify GraphQL API, building and deploying serverless functions and microservices, and automating infrastructure with Terraform. Must have 5+ years of professional full stack development experience, deep experience with cloud services (AWS or GCP), and proven ability to build and maintain serverless architectures and microservices.

Software Engineer III to develop next-generation technologies. Experience with Kubernetes, Java, Python, C++, JavaScript, TypeScript, HTML, and CSS required. Contribute to code reviews, documentation, and issue resolution. Bachelor's degree or equivalent experience and 2 years of full-stack development experience necessary.

SAP Development Solution Architect will design and implement scalable Production Planning solutions within SAP ERP/S4HANA. Responsibilities include collaborating with stakeholders, leading implementation efforts, and troubleshooting complex functional and integration issues. Requires 10+ years of experience as an SAP Consultant or Business Solution Architect with a strong focus on SAP ERP/S4HANA Production Planning. Expert-level knowledge of SAP PP, including MRP/MRP Live, BOMs, routings, work centers, production orders, planning strategies, capacity planning, and integration with MM, QM, SD, PM is essential. Solid experience with ABAP debugging and integration technologies (IDocs, RFC, APIs) is required.

Provides technical services on Merchant Automation systems, including troubleshooting, installation, maintenance, and repair. Requires a strong technical foundation in Marine Automation and control systems.

Senior Lead Generation Manager to build outbound engine for a specialized executive search firm focused on Web3, blockchain, crypto, and private capital. Define ideal client profiles, research market activity, and build structured prospect lists and outreach sequences. Design and refine a scalable outbound approach, establish systems for sustainable lead generation, and craft personalized outreach campaigns. Track hiring trends, identify companies raising funding, and continuously test and refine outreach strategies. Proven track record generating qualified leads within recruitment, executive search, or headhunting required. Strong senior-level experience with LinkedIn prospecting and outreach, engaging C-level and executive stakeholders, and understanding of recruitment firm sales processes. Ability to design strategy and build systems, not just execute outreach. Strong written English communication skills and independent, structured, and proactive working style.

Job Description UL Solutions is seeking a highly motivated Technical Sales Engineer to support and grow our Printed Circuit Board (PCB) business across the European market. This role blends deep technical understanding with strong commercial drive, customer engagement, and market development.

Salesforce Marketing Cloud Developer will design, implement, and document solutions. Requires 3+ years of Salesforce development experience and 1+ year with Marketing Cloud. Must be proficient in AMPscript, Journey Builder, SQL, SSJS, and REST/POST. Experience with Agile methodologies and conversational English (B2/C1 level) is required.

Software Test Engineer to design, develop, and execute test plans for data warehousing, analytics, and integration projects. Experience with Snowflake and computer systems validation, including ERES regulations, is required.

Experienced Windows Server System Engineer needed to administer, maintain, and secure a Windows Server environment. Responsibilities include system monitoring, troubleshooting, automation, documentation, security, and project participation. Requires a degree in a related field, proven experience, and expertise in Active Directory, DNS, DHCP, Group Policy, File Services, virtualization, PowerShell scripting, and network security. Excellent communication and problem-solving skills are essential.