The American outfit scored points in three of the first four grands prix in its debut season, but managed just two more top 10 finishes in a 2016 of peaks and troughs.
It was not quick enough analysing data during race weekends, causing the team to lose its way too many times, but the evidence so far in 2017 suggests progress has been made in that area.
Ahead of 2017's regulation change, Haas switched its main focus to this year's car before making its F1 debut, and was using 100% of its windtunnel time on its new challenger by May.
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"We've made a step forward, which is good, which is natural," said Steiner.
"Last year was our first year and for our first year we didn't do bad but we need to show progress and we showed progress.
"The car seems to be more competitive than last year's car and the team seems to be working better to sort out what we planned last year.
"What we always said is we needed to get stronger in race preparation.
"But to get good people in takes time because they all have long-term contracts, they came on board at the end of last year, beginning of this year and it seems to be working."

Romain Grosjean (Haas) - Bahrain GP 2017

Image credit: Getty Images

Romain Grosjean pinpointed Haas's recruitment drive, which began early last year with an eye on this term, as key to improving its approach during a race weekend.
"We have got more people onboard, we have more understanding and more data to look at, so that's great," he said.
"When we struggle, we've got people helping us finding essential things like tyres, aero, diff. All areas are covered.
"From there, we can work harder and find where the problems are."
Kevin Magnussen scored the outfit's first points in China with eighth, while Grosjean got on the board by repeating that feat in Bahrain.
F1's midfield is much tighter this term, with Haas currently seventh and locked in a battle with Williams, Force India, Renault and Toro Rosso.
The fact Haas is able to fight consistently with established teams on three very different circuits is encouraging for Steiner.
"We are much more solid, we are only in our second season and compare ourselves with the Williams or the Renault, which was Benetton, Toleman, whatever," said Steiner.
"I think it shows that we are doing a decent job - that's what we want to do.
"To challenge the big ones is a long way away but to be in the midfield and always trying to be in the top of the midfield is already for us quite satisfying.
"But it is hard work, it doesn't come for free, there is a lot of people, good people, and to try to beat them is challenging but also satisfying and good fun."
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