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Full-Stack Javascript Developer (Hybrid)


1 year ago

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The company

We are a leader in mobile technology, providing innovative solutions to 1.2 billion consumers. In an ever-increasing digital world we help businesses grow their digital reach & toolkits to optimize user experience, increase engagement, attract new customers and boost their revenues.

Think of performance marketing but on steroids as our top-notch marketeers and engineers build digital journeys through an omnichannel marketing approach like no other. Currently we work with the biggest names in Telco, Insurance, Education, FMCGs and Retail in over 45 countries in Latin America, Africa, the Middle East and South-East Asia.

The role

In the context of our growing business and ongoing project needs, we are looking for an enthusiastic Full-Stack JavaScript Developer to join our Software Development team in Athens, Greece.

Our HQ offices are based in Gerakas and we have adopted a hybrid work mode.

As a Full-Stack JavaScript Developer you will be part of a very competent team that works on mission - critical applications contributing in all phases of the development process. You will use a modern JavaScript tech-stack (e.g. React/NextJS, Express.js) to build both the public facing and internal application components of our products. You will be responsible for application development, supporting business objectives while providing expertise in the full software development lifecycle, from concept and design, to testing.

Your main responsibilities will be to:

  • Write well designed, testable, efficient software modules.

  • Translate designs and wireframes into high-quality code.

  • Create reusable components for the frontend component library.

  • Troubleshoot and support existing products and infrastructure.

  • Care about writing clean, maintainable and efficient code.

  • Review, test, and debug code.


Knowledge, Skills and Experience

  • Computer Science, Engineering or equivalent degree

  • Hands-on experience in designing and developing full stack applications using JavaScript, Typescript.

  • Hands-on experience in a popular library/framework such as React, Angular, Next.js, Express.

  • HTML and CSS.

  • Designing and consuming HTTP APIs.

  • SQL and NoSQL databases and caches (e.g. MongoDB, PostgreSQL, Elasticsearch, Redis, Memcached).

  • Messaging systems such as Kafka.

  • CI/CD tools and processes.

You will be an excellent fit for our team if you are:

  • Strong team player with good communication skills.

  • Eager to work with leading-edge technologies.

  • Analytical thinker with attention to detail.

  • Reliable and dedicated professional with clear thinking and strong attention to detail.

  • Able to multitask and thrive in a dynamic environment as well as balance and prioritize activities to ensure critical items are addressed.


We offer a competitive base salary and benefits, including private health insurance plan, transportation fees, meal vouchers, and mindfulness program subscriptions. The real excitement comes from working closely with a dynamic, smart, agile and highly motivated team in a competitive and fast paced environment.

Upstream is an equal opportunity employer. The Company does not discriminate on the basis of race, colour, creed, pregnancy, religion, gender, national origin, age, disability, marital, or any other legally protected status. The Company also makes reasonable accommodations for disabled employees. Finally, the Company prohibits the harassment of any individual based on their protected status. This policy applies to all areas of personnel actions including recruitment, hiring, training, promotion, compensation, benefits, transfer, and social and recreational programs.


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Upstream201-500 employees
Upstream is a leading mobile technology company driving digital acquisitions and sales across every mobile channel available.

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