CALLSTATS I/O Oy is a SaaS company based out of Helsinki. We provide products that measure and manage the performance of real-time communications. The callstats.io product helps software developers setting up, building, and scaling real-time communication applications effortlessly and frictionlessly. We are backed by the best! True Ventures from Silicon Valley and Lifeline Ventures from Helsinki have invested into us.

Our culture

• Our solutions aim to excite our customers daily.
• Data is the critical part of our product. We constantly raise the bar on the user-experience.
• Rome was not built in one day. All our projects start small and gradually increase in complexity.
• We are constantly shipping code. Done is better than perfect – the moment when the feature is better than what is already live on the site.

Blog posts related to working at callstats.io

• Getting a New Employee Coding in 30 Minutes
• Learnings from One Year of Using React
• Selecting a New Front-End Framework for Callstats.io
• Check out the Forward Error Correction puzzle at the end of this blog post.

Job description

You will be designing, building, maintaining, and rolling out our core services. Our systems are all the time in the process of being re-factored in to more performant subsystems or micro-services. Apart from writing code, you will end up looking at logs, debugging and rolling out patches on a day-to-day basis. On a weekly basis, you will demo your work internally to the team on friday demos, and from time-to-time externally to our customers.

You have strong fundamentals in algorithms, data structures, statistics, and networking. You love prototyping new tools and features that may help our customers make better data-driven decisions. You’re comfortable working with Python, Golang, Java, and JavaScript, among other languages, and are excited about using new languages and tools as needed. If that’s you, introduce yourself and let’s build great things together!

What we expect from you

• You have strong experience and accomplishments building scalable, high availability, Internet-scale big data infrastructure.
• You are proficient in any two of the following: Python, Go, Node.js
• You have hands-on experience with at least some of the following: Kafka, Storm, Message Queues, NoSQL DBs, AWS Lambda.
• You have a deep understanding of DNS, Anycast, and are able to set up load balancing for performance and redundancy.
• You care about the performance of a server and analyze logs to diagnose performance issues.
• You are able to perform root cause analysis when outages occur or performance degrades.
• Fluency in spoken and written English.