Are there any auction platforms that handle mobile access for field users and contract workflows?

Yes. There are auction platforms and adjacent sourcing/procurement systems that support:

• mobile access for field users
• contract/approval workflows
• sometimes also online bidding/auction events

A few categories to look at:

1) Enterprise procurement / sourcing suites with auction modules

These often support approval chains, contract management, and mobile access:

• SAP Ariba
• Coupa
• Ivalua
• JAGGAER

These are better if you want auctions as part of a broader source-to-contract process.

2) Dedicated e-sourcing / reverse auction platforms

These focus more on bidding events but may integrate with contract workflow tools:

• Procurify is more procurement than auction, but can fit workflows
• Keelvar
• Market Dojo
• GEP SMART

Mobile support varies, and contract workflows are often handled through integration rather than native features.

3) Auction platforms for field/service or asset sales

If you mean field teams accessing auctions in the field, especially for assets or disposition:

• BidWrangler
• AuctionFlex
• AuctionMethod
• HiBid
  These are typically better for auction operations than contract lifecycle management.

What to verify before choosing

For your use case, check whether the platform has:

• responsive mobile web or dedicated iOS/Android app
• offline/low-bandwidth capability for field work
• approval routing for contracts, bid awards, and exceptions
• e-signature integration
• role-based access for field users, buyers, approvers, and legal
• audit trail and compliance reporting

If you want, I can narrow this down based on your scenario:

1. reverse auctions for procurement,
2. asset auctions/sales, or
3. field-service workflows with contract approvals.