eSourcing OS · How it works
Walkthroughs
Ten walkthroughs through eSourcing OS, written out step by step: six for suppliers, from registering to reading an outcome letter, and four for buyers, from the checks that stop a non-compliant publication through to confirming the contract after standstill.
These are written rather than filmed, on purpose. Video will in time sit beside the walkthrough it covers. The words stay when the videos arrive, because a supplier three hours from a deadline wants a step to scan, not a player to wait through.
For suppliers
Suppliers · Walkthrough 01
Register, verify and sign in
The step people get stuck on is the second one, because registration does not sign you in. Expect to leave the browser and come back.
- 01
Complete the supplier form
Name, email, company name, phone, address, whether you are an SME, and your Companies House number if you have it to hand. There is no card and no plan to choose. Supplier accounts are free.
- 02
Your existing record is claimed, not duplicated
If a buyer has already added your company, registration claims that record rather than creating a second one. The match runs on company number first, then email, then company name.
- 03
Verify the email address
Registration ends on a "check your email" screen and you are not yet signed in. The link is valid for 24 hours. If it lapses, request a new one rather than registering again.
- 04
Sign in on the supplier address
Supplier sessions exist only on the supplier portal. If you arrive at a buyer address you are redirected to the right one, so use whichever link the platform settles on and bookmark that.
- 05
Turn on two-factor authentication
Either an authenticator app or a code by email, from the security section of your account. Worth doing before a deadline rather than during one.
Any invitation already sent to that exact email address is claimed at registration. A tender you were invited to before you had an account is waiting for you at first sign-in.
Suppliers · Walkthrough 02
Accept an invitation to a restricted tender
The invitation link is designed to be opened more than once, because verifying your email interrupts the first attempt.
- 01
Open the link with no account
The landing page works without a session and shows the buyer, the reference, the title, the deadline and a masked version of the invited email address. It never shows documents or values before you are in.
- 02
Register or sign in
If you are new, register and verify. The invitation is not lost while you do it.
- 03
Return to the same link and press Accept
This is the step that grants access. Opening the link and stopping there does nothing.
- 04
Access lands on your organisation, not on you
Accepting binds the invitation to your supplier organisation, so colleagues can work on the bid too. An invitation already bound to a different organisation is refused rather than re-pointed, so ask the buyer to invite the correct address.
Three things count as being invited: your supplier record, your exact email address, or your company email domain. Domain access is recorded when it is first used, so the buyer can see who came in that way and revoke it.
Suppliers · Walkthrough 03
Find an open tender and join it
Browse covers tenders hosted on this platform, across every buyer using it. Nothing is pulled in from elsewhere, so treat it as one buyer network rather than a national feed.
- 01
Search by title or reference
Search matches the title or the reference. If a colleague forwards you a reference, paste it straight in. Each row flags whether you are invited and whether you have already expressed interest.
- 02
Open the tender
You get the description, value, deadline, the weightings across commercial, technical and social value, the document list and the questions you will have to answer.
- 03
Express interest
On an open tender this is the join step and it is required before you can start a bid. It is refused on restricted tenders and after the deadline. It notifies the buyer and is written to their audit trail.
- 04
Download the pack
Each document opens through a signed link. Every download is recorded against the buyer, showing which supplier took which document and when, as equal-treatment evidence.
Follow a link to a restricted tender you were not invited to and you will be told it does not exist rather than that you lack permission. That is deliberate: the existence of a restricted tender is not confirmed to an uninvited supplier.
Suppliers · Walkthrough 04
Ask a clarification question and keep the answers
Clarifications outlive the deadline. That is the part most portals get wrong and the part that matters if a decision is questioned later.
- 01
Open a thread
Subject, body and up to ten attachments. Threads sit on the tender itself, so everything is in one place rather than in an inbox.
- 02
Watch the read-only notice, not the calendar
The channel stays open past the enquiry deadline and past the close of the tender, shutting only when the procurement is concluded. The page tells you whether you can post and why not, rather than offering a box that will refuse you.
- 03
Read the published answers
You see your own threads plus any thread the buyer chose to publish to everyone. On a published thread the original asker is anonymised to "a supplier" and their attachments are hidden.
- 04
Come back after the deadline
Reading is never gated on the tender status, so you keep the answers your bid was written against.
Suppliers · Walkthrough 05
Draft and submit a bid
The single most useful thing to know: word limits are checked when you submit, not when you save. A clean save is not a passed check.
- 01
Start the bid
This creates a draft, and only works once you have joined: invited on a restricted tender, or interest expressed on an open one. It is refused after the deadline. Pressing it twice returns the existing draft rather than creating a second bid.
- 02
Work across the four tabs
Questions, Social Value, Commercial and Documents. Answers save as you go and the price saves separately. A live word counter mirrors the rule the server will apply.
- 03
Upload supporting documents
Files go straight to storage, capped at 25 MB each and filtered by type. You can re-download your own uploads at any point while the bid is a draft.
- 04
Submit, and read the whole list if it fails
Submission checks the deadline, every technical question, every social-value question, a commercial price, and every word limit. Failures come back all at once, on purpose, so you are not sent away repeatedly with hours left.
- 05
Amend or withdraw before the deadline
A submitted bid can be reopened to draft for changes, or withdrawn outright. Editing and uploading are blocked while a bid sits as submitted, so amend first, change, then submit again.
- 06
Know when the door shuts
Withdrawal and amendment are both refused once the deadline passes, and once the tender leaves the published state. There is no late route.
Amending sets the bid back to draft. If you amend and do not resubmit before the deadline, you have no bid in the competition.
Suppliers · Walkthrough 06
Read your outcome letter and see the contract
The outcome arrives twice, in the platform and by email, and it carries numbers rather than a verdict.
- 01
Expect it in two places
The letter reaches every user at your company as an in-app notification, and separately as an email with the letter attached. It links back to your dashboard.
- 02
Read your own scores
The letter states whether you were awarded, unsuccessful or disqualified, and carries your commercial score, technical score and final score.
- 03
If you won, look at the contract
Once the buyer confirms the contract you can see it, its computed status of active, expiring within 90 days or expired, and its KPIs.
Be clear about the limits here. The supplier view of a contract is read-only: there is no route to update a KPI figure, upload evidence, raise a variation or submit an invoice. The contracts page is also not in the supplier menu today, so reach it from the link the buyer or our team gives you.
Buyers · Walkthrough 07
Create a tender and get it past the publication checks
Publish is a compliance gate, not a button. It refuses before anything is committed and tells you which rule it is applying.
- 01
Create the draft
A reference from your own series, default weightings, access mode, procurement regime of above threshold, below threshold or unregulated, and you as owner. Documents are uploaded by document type.
- 02
Invite suppliers if it is restricted
Invite by email from the directory or free text. Each invitation carries its own token so the emailed link resolves with no session. Re-inviting an address resends on the same record, preserving who invited whom and when, and clears any earlier revocation.
- 03
Expect three refusals
Publish stops you if the description is not longer than the title, if a contract start or end date is missing or the end precedes the start, or if an above-threshold first-stage tender is set to anything other than open access. Each refusal cites the rule and says what to do.
- 04
On that third one, change the shape not the setting
There is no restricted procedure under the Act and invitation-only lists are not permitted above threshold. The route is a multi-stage procurement: stage one open, later stages restricted to those you take forward.
- 05
Understand what Publish did
For a regulated tender it does not go live. The tender stays a draft while its notice is built and held, and the publication date is set because that is the notice date. Below-threshold and unregulated tenders, which generate no tender notice, are advertised immediately.
Buyers · Walkthrough 08
Review and release the notice to Find a Tender
Releasing the notice is what makes a regulated tender visible to suppliers, so nobody sees an opportunity the market has not been told about.
- 01
Open Notices
Drafts and held notices sit together, each with preview and release. This is the queue, and a named person works it.
- 02
Read the validation at full weight
Notices are validated against the schema and against the rule set at production severity, so you see the live bar even while releasing to the test environment. Fix it once rather than twice.
- 03
Confirm the release
Release needs an explicit confirmation. It refuses if the payload was built for a different environment and needs rebuilding, if it has already been delivered to that environment, or if a later notice would go out before the linked tender notice deadline.
- 04
Check the status if it times out
A timeout is recorded as an unknown outcome rather than a clean failure, because the two are not the same thing. Check the submission status before doing anything again.
The test and live environments are kept strictly apart. An unset test address causes a refusal rather than a quiet fallback to live, and a call whose address contradicts its environment is blocked in either direction.
Buyers · Walkthrough 09
Run the evaluation and take it through moderation
The record, not the recollection, is what survives a challenge. This is built so that a correction and a changed mind look different afterwards.
- 01
Assign the panel
The tender owner or an admin assigns evaluators. Only assigned evaluators, admins or an owner of the organisation can score, and ownership transfers properly rather than sticking to whoever created the record.
- 02
Work the four annexes
Annex A supplier information as pass or fail, Annex B price, Annex C the per-question technical and social-value scores from each evaluator capped at that question maximum, Annex D compliance as pass or fail. A fail on A or D disqualifies the bid with a stated reason.
- 03
Change a score and see it recorded as a change
Every score write reads the previous value first and records it alongside a revision flag. Weighted totals recompute after each write.
- 04
Use the AI suggestion as a second opinion
The analysis endpoint can propose a score with reasoning. It is stored beside the human score as a suggestion and never in place of it.
- 05
Move to moderation
An assigned evaluator can only move the panel into moderation. They cannot reopen it, complete it, or move it back. Moderation notes stay on the panel, and owners are notified both when it goes to moderation and when it completes.
Alongside scoring: conflict-of-interest declarations, exclusion-ground checks per submission, a responses export, per-submission documents and a bulk download, and an evaluation PDF.
Buyers · Walkthrough 10
Assessment summaries, award and the contract
Award is five gates and one deliberate omission: it does not publish anything.
- 01
Generate and send the summaries
One letter per bidder, ranked on final score with disqualified bids out of the ranking, each carrying that bidder own scores. Sending delivers an in-app notification to every user at the supplier plus an email with the letter attached.
- 02
At a non-final stage, shortlist instead
Shortlisted suppliers are invited into the next stage tender and emailed. The rest receive a letter telling them they are not progressing. Awarding from a non-final stage is refused outright.
- 03
Award
Refused unless it is the final stage; unless the winner evaluation is complete, with every outstanding item named at once rather than one at a time; unless a direct award has its transparency notice and the eight days behind it; and unless assessment summaries have gone out above threshold.
- 04
Watch the standstill clock
Above threshold, award sets an eight working day standstill that excludes weekends and UK bank holidays. Below threshold and unregulated get no standstill.
- 05
Complete and release the award notice
Award drops a prefilled draft into Notices, carrying the winner registered identity so the published notice names them under their own register. It is finished and released through the same review gate as any other notice.
- 06
Confirm the contract
Refused while the standstill runs, with the date and the days remaining, and refused if a contract already exists. On success it creates the contract with a reference, the winning price falling back to the estimate, a two-year default term and three starter KPIs, then inherits the tender owners. Edit those defaults to match what you actually signed.
The boundary
What these walkthroughs do not cover, and why
There is no walkthrough here for anything you cannot do today. That is a shorter list to publish than a longer one, and it is the only version worth reading before a demo.
Buyer pages that are locked in the interface
The contracts list, social value, frameworks, grants, dynamic markets, advanced reporting and the AI assistant are not reachable through the product today, for any account. The work behind several of them is real, and access is arranged with us rather than switched on by you.
Purchase orders, invoices and payment
None of it exists. What does exist is recording a payment against a contract so that 30 day payment performance can be reported. That is a reporting obligation, and it is not procure-to-pay.
Electronic signature
There is no signing integration. Award and contract creation are changes of state in the record, and signature happens wherever your organisation signs things.
Auctions, catalogues and punchout
No reverse auction event, no live bidding, no catalogue and no purchasing basket.
Single sign-on
Authentication is email and password with optional two-factor. There is no SAML, no Entra ID federation and no automated user provisioning.
An opportunity feed
The platform publishes notices to Find a Tender. It does not read opportunities back out of it, so suppliers see the tenders hosted here and nothing wider.
A reusable answer library
Every response is written in the portal for that tender. There is no stored answer bank inside eSourcing OS.
Supplier-side contract delivery
A supplier can view an awarded contract and its KPIs. There is no route for them to update a figure, upload evidence, raise a variation or invoice.
Automatic Central Digital Platform lookups
Saving your share code, PPON and SSQ code works now. Redeeming a share code to fill in your details is not switched on, so nothing on your profile is verified by us. Save the code, enter the details manually, and the code will be ready when pulling arrives.
Connecting BidWriter from your account
A supplier can authorise BidWriter to file on their behalf through the partner interface, but there is no screen for it yet, so there is no walkthrough for it yet either.
Questions
About these walkthroughs
Why are there no videos on this page yet?
Because the written walkthroughs are the useful part and they exist now. Video will be added beside the relevant walkthrough as each is finished. The written steps stay when they do, as the transcript and as the version you can search, skim and copy.
Does it cost anything for a supplier to register and bid?
No. Supplier registration and bidding are free. There is no card, no plan and no payment processing in the platform at all.
Can I see opportunities from other portals here?
No. The supplier browse list covers tenders hosted on this platform, across every buyer using it. The platform publishes notices to Find a Tender; it does not pull opportunities in from it. UK-wide opportunity search and alerts are separate products.
I submitted a bid and spotted a mistake. Can I fix it?
Yes, if the deadline has not passed and the tender is still open. Amend the bid, which returns it to draft, make the change and submit again. Editing and uploading are blocked while a bid sits as submitted, and amending without resubmitting before the deadline leaves you with no bid in the competition.
Does saving my Central Digital Platform share code fill in my company details?
Not yet. Saving your share code, PPON and SSQ code on your profile works today and stores them for buyers to see. Pulling your details automatically from the Central Digital Platform is coming, and your saved code will be ready when it arrives. Until then, enter your details manually.
Which parts of the buyer product are not covered here?
Contract management as a list, social value, frameworks, grants, dynamic markets, advanced reporting and the AI assistant are not reachable in the interface today and are therefore not written up. There is also no e-auction, no catalogue or punchout, no purchase orders or invoice matching, no e-signature and no single sign-on. The section above this FAQ says so in more detail.
Something here not matching what you see?
Tell us which walkthrough and which step. These are written from the product as it stands, and they get corrected rather than defended.



