Optus MD of marketing and revenue, Matt Williams, is leaving Australia's second largest telco after a five-and-a-year stint.

Announcing his departure on LinkedIn, Williams said he'd decided to step down and will be leaving the Optus family. He has not confirmed his next professional step.

"The business is tracking positively with strong momentum as shared in our quarterly results, and now feels like the right time to make a change as the business prepares for the next phase," Williams said in a post. "I'm extremely proud of what we've achieved and the amazing work by all of the many people at Optus who have made it happen."

It's certainly been a tumultuous few years for the Optus executive. During this time, Optus had one of the biggest breaches in the country's history. It also experience a massive network outage that has triggered new regulation around 000 services in Australia.

Williams acknowledged the challenges, but said the telco had strengthened and grown the business while navigating through the massive events of the cyberattack and network outage.

"I'm proud of what we've achieved in gaining customers and building back our brand and customer satisfaction after those major events (not once, but twice), growing our business improving both revenue and profit, and building our people enabling them to grow to make the most of their talent," he stated.

For the last 11 months, Williams has been MD for an integrated product business unit, dubbed Customer Solutions. It was a role created in the lead-up to the ultimately doomed attempt to recruit Danielle Keighery as MD of marketing and corporate affairs. Keighery pulled out at the 11th hour in favour of becoming the new group corporate affairs leader at Qantas in February this year.

Prior to the reshuffle, Williams had been MD of marketing and revenue, a role that the VP of marketing position reported directly into.

Prior to joining Optus, Williams spent more than 12 years with Vodafone in the UK, Europe and New Zealand, working up from senior marketing roles to become group commercial director in the UK then consumer business unit director for NZ.

Optus declined to comment further.