Are 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.
CUSTOMER
Our 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.
PROJECT
The 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 Description- Configure and maintain website integrations, including event tracking, SPA fixes, cart tracking, and catalog integrations
- Implement and support Email Service Provider integrations and synchronization workflows
- Execute migration and replatforming activities with comprehensive validation and testing
- Develop custom onsite JavaScript solutions for campaigns and interactive user flows
- Build and support Airflow DAGs for recurring data processing workflows
- Configure dynamic email content and SKU-level recommendation tracking
- Analyze Customer requests and assess technical feasibility of solutions
- Develop integrations with third-party marketing and email platforms
- Investigate and resolve production issues and perform root cause analysis
- Collaborate with account managers, QA engineers, and implementation specialists
- Participate in technical consultations and onboarding alignment meetings
- 2+ years of commercial experience with Vanilla JavaScript (ECMAScript 5+)
- Strong knowledge of HTML and CSS
- Hands-on experience with REST API integrations
- Practical experience with jQuery
- Experience with Chrome DevTools and browser debugging
- Understanding of behavioral event tracking implementation
- Knowledge of Email Service Provider integration workflows
- Ability to develop custom JavaScript logic for onsite experiences
- Strong analytical and problem-solving skills
- Good communication skills with technical and non-technical stakeholders
- Attention to detail and commitment to code quality
- Experience working in cross-functional teams
- Intermediate+ English level
- Readiness to learn new tools and domain-specific technologies
WILL BE A PLUS
- Experience with PHP
- Familiarity with Apache Airflow
- Experience using Postman
- Understanding of Git workflows
- Experience with AdTech or marketing technology platforms
- Exposure to Customer-facing onboarding or integration projects
PERSONAL PROFILE
- Proactive and solution-oriented mindset
- Strong ownership and accountability
- Ability to work independently and collaboratively
- Detail-oriented approach to testing and troubleshooting
- Comfortable working in a fast-paced environment
- Strong communication and stakeholder management skills
Skills Required
- 2+ years of commercial experience with Vanilla JavaScript (ECMAScript 5+)
- Strong knowledge of HTML and CSS
- Hands-on experience with REST API integrations
- Practical experience with jQuery
- Experience with Chrome DevTools and browser debugging
- Understanding of behavioral event tracking implementation
- Knowledge of Email Service Provider integration workflows
- Ability to develop custom JavaScript logic for onsite experiences
- Strong analytical and problem-solving skills
- Good communication skills with technical and non-technical stakeholders
- Attention to detail and commitment to code quality
- Experience working in cross-functional teams
- Intermediate+ English level
- Readiness to learn new tools and domain-specific technologies
- Experience with PHP
- Familiarity with Apache Airflow
- Experience using Postman
- Understanding of Git workflows
- Experience with AdTech or marketing technology platforms
- Exposure to Customer-facing onboarding or integration projects
What We Do
Sigma Software Group, an award-winning and trusted IT partner, has been serving customers for over 21 years, providing comprehensive IT solutions to various businesses, ranging from startups to established software product houses. As one of Europe's substantial IT consultancies, it brings together a dedicated workforce of over 2,100 professionals in 40 offices across 19 countries. With a diverse client base, including more than 300 enterprises, including Fortune 500 stalwarts, Sigma Software Group is a preferred choice for developing solutions that help businesses create cutting-edge products while meeting their unique needs. Sigma Software Group operates as a dynamic ecosystem of tech companies, offering 25 ready-to-implement innovative products and 40+ value-added services. Furthermore, Sigma Software Group is committed to fostering innovation through initiatives such as the Sigma Software Labs business incubator, Sigma Software University, the SID Venture Partners VC Fund, UA Tech Network, Techosystem, the European Business Association, and other collaborative efforts. Since 2015, Sigma Software Group has consistently earned recognition on the IAOP's prestigious World's Top 100 Outsourcing list. The company's accomplishments have also been acknowledged by prominent global media outlets such as Forbes, CNBC, The Times, and Reuters
