Software Developer – Testinium Tech Hub Cooperation; Fresh Grad​/Junior

About Insider One

Insider One is a B2B SaaS company that helps global brands grow by creating better customer experiences — at scale.

We are the world’s #1 AI-native Customer Experience and Marketing Platform. Our platform helps marketers build personalized journeys, grow their business, and work more efficiently — all in one tool.

We recently raised $500M in Series E funding, led by General Atlantic. Before that, we became a unicorn (a startup valued at over $1 billion), and one of the few woman‑led B2B SaaS unicorns in the world. Today, we are backed by investors like Sequoia Capital, QIA, Riverwood, and Endeavor Catalyst. Over 1,200 global brands trust us — including Samsung, Coca-Cola, IKEA, Nike, and Virgin, as well as fast‑growing startups.

We’ve been recognized as a Leader by Forrester and IDC, and listed among G2’s Top 1% software companies in the world, ranking #1 in many categories such as Customer Data Platforms, Personalization Engines, and Mobile Marketing.

Testinium is our trusted partner in software quality and testing. They offer an open‑source‑based, enterprise‑ready platform for test automation on web, mobile, and desktop. Their headquarters is in Istanbul, with offices in Amsterdam, London, and Berlin. Testinium is now the largest software testing company in Europe and the MENA region, with 950+ employees and 350+ projects. They work with many respected companies in finance, telecom, and e‑commerce, like ING, Allianz, Pepsi Co, Turkcell, N11, and Udemy.

You’ll join our Optimus team as a Software Developer. Optimus (Partner Support Development Team) provides technical support behind the scenes. We solve problems, keep our platform running smoothly, and make sure our partners have the best experience. We work fast, solve complex issues, and focus on both product and partner success. In SaaS, partner support means high‑quality service — and that’s what Optimus delivers.

• Provide technical support to 800+ global partners using JavaScript, HTML, CSS, and Go
• Fix complex issues on partner websites
• Join meetings with international clients and give live support when needed
• Build user‑friendly and high‑performance web apps
• Take action to prevent future technical problems
• Work with other teams to ensure smooth processes
• Prioritize tasks based on urgency and partner needs
• Gain hands‑on experience with Vue.js, Node.js, React, and Go
• Work in a fast‑paced and agile environment

• A degree in Computer Engineering or a related field (or equivalent experience)
• Good knowledge of JavaScript, jQuery, HTML, and CSS
• Basic knowledge of backend development and SQL (advanced knowledge is a plus)
• A proactive and responsible approach to work
• Fluency in Turkish and English
• Good problem‑solving and analytical thinking skills
• Ability to manage time well and work on multiple projects
• Curiosity and motivation to keep learning

• Enjoy a monthly meal allowance designed to enhance your daily routine.
• Access comprehensive private health insurance.
• Feed your curiosity with access to Spotify, Linked In Learning, Blinkist, Master Class, Neoskola, and Cloud Guru.
• Level up with internal trainings covering AI fundamentals, coding, foreign languages, and a wide range of personal development skills.
• Be part of a diverse team that’s as global as it gets, where every voice is heard and 50+ nationalities build together.
• Become a Share owner through our eligibility‑based “ESOP” and own a piece of what you build.
• Help build the team you want to work with and enjoy rewarding referral bonuses.
• Opportunities to give back to your community through volunteering and purpose‑driven social impact projects.
• From global retreats to team‑building activities, expect year‑round events that turn into lifelong memories.
• Get inspired by the greatest minds in the tech industry through events like our Tech & Dev Talks.
• Work from anywhere in Turkey through our fully remote setup.

We aren’t just hiring for a position; we are hiring for a mission — a mission to build a lasting legacy that will set the benchmark for the most progressive tech companies out there.

To do this, we are looking for exceptional talent to join a community of good‑hearted individuals who take high ownership and are relentlessly driven to go the extra mile.

If this sounds like who you are and where you aspire to be, we are excited to meet you.