Junior JavaScript Developer

Google Chrome Microsoft Edge Apple Safari Mozilla Firefox Junior JavaScript Developer Full-timeCompany DescriptionAre you passionate about JavaScript development, integrations, and solving complex technical challenges in customer-facing environments? We are looking for a Junior JavaScript Developer to join a dynamic AdTech project focused on behavioral analytics and marketing automation.At Sigma Software, you will work on scalable integrations connecting websites, marketing platforms, and real-time customer engagement systems. This role combines Front-end development, API integrations, troubleshooting, and collaboration with international teams.We as a company offer a supportive engineering culture, opportunities for professional growth, and the chance to work with modern AdTech and marketing automation technologies while contributing directly to customer success.CUSTOMEROur partner is a fast-growing AdTech company helping brands identify and engage anonymous website visitors through behavioral intelligence and marketing automation. The platform transforms browsing behavior into actionable insights, enabling personalized campaigns across email, SMS, and paid advertising channels. The solution supports businesses in improving conversion rates, customer engagement, and revenue growth through scalable data-driven marketing strategies.PROJECTThe project focuses on developing and maintaining integrations between the AdTech platform and customer ecosystems, including websites, Email Service Providers, and marketing automation tools. The team delivers behavioral tracking solutions, onboarding processes, real-time event pipelines, and personalized onsite experiences for international customers.You will participate in integration development, technical troubleshooting, migration activities, and implementation of custom JavaScript solutions for marketing campaigns and data synchronization workflows.Job DescriptionConfigure and maintain website integrations, including event tracking, SPA fixes, cart tracking, and catalog integrationsImplement and support Email Service Provider integrations and synchronization workflowsExecute migration and replatforming activities with comprehensive validation and testingDevelop custom onsite JavaScript solutions for campaigns and interactive user flowsBuild and support Airflow DAGs for recurring data processing workflowsConfigure dynamic email content and SKU-level recommendation trackingAnalyze Customer requests and assess technical feasibility of solutionsDevelop integrations with third-party marketing and email platformsInvestigate and resolve production issues and perform root cause analysisCollaborate with account managers, QA engineers, and implementation specialistsParticipate in technical consultations and onboarding alignment meetingsQualifications2+ years of commercial experience with Vanilla JavaScript (ECMAScript 5+)Strong knowledge of HTML and CSSHands-on experience with REST API integrationsPractical experience with jQueryExperience with Chrome DevTools and browser debuggingUnderstanding of behavioral event tracking implementationKnowledge of Email Service Provider integration workflowsAbility to develop custom JavaScript logic for onsite experiencesStrong analytical and problem-solving skillsGood communication skills with technical and non-technical stakeholdersAttention to detail and commitment to code qualityExperience working in cross-functional teamsIntermediate+ English levelReadiness to learn new tools and domain-specific technologiesWILL BE A PLUSExperience with PHPFamiliarity with Apache AirflowExperience using PostmanUnderstanding of Git workflowsExperience with AdTech or marketing technology platformsExposure to Customer-facing onboarding or integration projectsAdditional InformationPERSONAL PROFILEProactive and solution-oriented mindsetStrong ownership and accountabilityAbility to work independently and collaborativelyDetail-oriented approach to testing and...