The Australian market is home to some exceptional tech companies such as XERO FPO NZX (ASX: XRO) and Altium Limited (ASX: ALU). Thanks to their strong performances both companies have deservedly gained a lot of attention in the last 12 months.

Because of this most investors are well aware of these two companies and their shares appear to be fully valued as a result. But further down the market there are a number of growing tech shares which don’t gain as much coverage.

Three which I believe are flying under the radar and could be priced well for a buy and hold investment today are as follows:

Hansen Technologies Limited (ASX: HSN)

This billing and customer care software provider thoroughly impressed me with its full year results at the end of August. Those results saw Hansen post a massive 54.4% increase in net profit after tax to $26.1 million. Whilst earnings growth is expected to slow a touch in FY 2017, management is still expecting revenue to increase by up to 17.5%. Although at 30x full year earnings its shares are starting to look a little expensive, I believe Hansen represents a fantastic buy and hold investment. Its sticky products and the long-standing relationships it builds with clients gives me the confidence to believe that the company can continue growing for at least the next decade.

Nextdc Ltd (ASX: NXT)

Due to continued strong demand for its services this data-centre-as-a-service provider last week announced its plans to raise $150 million in order to build a second data centre in Sydney. Investors responded positively to the news, with its shares surging by over 5.5% when they came out of their trading halt. This brought its year-to-date return to a massive 66%, but it might not stop there. A research note out of UBS today reveals that the investment bank has reiterated its buy rating on NEXTDC’s shares and increased its price target to $4.75. This is approximately 19% higher than the current share price. Thanks to the seismic shift to cloud computing, I believe NEXTDC is perfectly positioned for sustained growth. This makes it a buy in my eyes.

Touchcorp Ltd (ASX: TCH)

This provider of secure transaction processing, payments and data services is definitely one to watch in my opinion. It recently reported a 21% rise in half year revenue to $22.5 million, thanks largely to a strong performance from its domestic business. But as well as having a growing domestic business, Touchcorp has been busy expanding overseas in recent months. One such deal with Cornèr Bank in Switzerland is expected to provide the company with long-term transactional revenue streams. A further bonus with an investment in Touchcorp is that investors also gain exposure to the rapidly growing Afterpay Holdings Ltd (ASX: AFY). Afterpay’s share price has risen 124% since listing on the ASX in May. With Touchcorp having a 30% stake in Afterpay, this is great news for its shareholders.

But before you make an investment in any of these I would highly recommend you take a look to see if you own either of these three wealth destroying ASX shares. Each could be harming your portfolio and might be best swapped out if you ask me.

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Motley Fool contributor James Mickleboro has no position in any stocks mentioned. The Motley Fool Australia owns shares of Hansen Technologies, TOUCHCORP FPO, and Xero. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy. This article contains general investment advice only (under AFSL 400691). Authorised by Bruce Jackson.