Koll

Erlang Solutions partnered with Koll, a telecom innovator transforming how users verify and control phone calls. We audited their Elixir-based platform, confirmed its security, and helped strengthen their foundation as Koll scales globally from beta to full production.

Koll

The Company

Founded in 2023, Koll is redefining telecommunications by making phone calls secure, trusted, and user-controlled. The Koll app empowers users to verify a caller’s identity and purpose before answering, eliminating scam calls and making every call meaningful. By giving individuals and businesses full control over incoming calls, Koll helps customers cut through the noise of daily interruptions, allowing them to stay focused on what matters.

The Requirement

Koll built its platform using Elixir, valuing its global communications scalability and the strength of its open-source libraries.

Despite being an early-stage company, the Koll team recognised the importance of an expert review from industry leaders to assess security, identify vulnerabilities, and receive actionable recommendations.

Having followed Erlang Solutions (ESL) and the Security Audit for Elixir (SAFE) initiative for some time, Koll chose to undergo the audit to review the strength of their codebase and uncover potential opportunities for improvement.

The Solution

Erlang Solutions carried out SAFE for Koll’s Elixir codebase, focusing on the most critical risks for core Elixir issues.

The audit involved a thorough review of Koll’s system to identify vulnerabilities, followed by a report detailing recommended fixes and prioritised actions. The feedback was designed to highlight necessary improvements and offer clear explanations for each finding.

The Outcome

Koll received a clean bill of health following the audit, confirming their system is secure and well-structured. Improvement areas were also identified and added to their development roadmap.

As Koll aims for global scaling with 1 billion users, the audit reinforced confidence in their technical foundation, particularly as they transitioned from beta to full production this year.

SAFE also offered practical insights to support long-term development, with future integration planned to support ongoing code checks.

“The collaboration with Erlang Solutions was seamless and professional. Their support was invaluable in checking the security of our platform, and their expertise helped us confirm the strength of our system.

“It was a pleasure to go through the process. We’d recommend Erlang Solutions to anyone.”

Lauri Kainulainen CTO, Koll

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