Senior Full-Stack Engineer for a B2B Marketplace (FastAPI/Supabase/React, Claude Code, Linear)

What this signal says

Leadiy recorded “Senior Full-Stack Engineer for a B2B Marketplace (FastAPI/Supabase/React, Claude Code, Linear)” as a hiring signal, not as a copied job-board article. The public page keeps only the facts needed to understand the commercial request: the role or outcome, normalized technologies, engagement format, stated budget, observation time and the exact destination for a response. Contact names, email addresses, outreach drafts, private notes and the imported source row stay outside this page. The useful question is therefore narrow: what kind of software demand is visible here, and what should a supplier verify before deciding to respond?

How the technology was normalized

The controlled technology reading for this record is React, FastAPI, PostgreSQL, Sentry, React/Next.js + FastAPI. That label is derived from explicit terms in the role, primary technology and stack fields; it is not inferred from the buyer’s identity or from private contact context. Normalization folds common spelling and naming variants into one catalog so this page can be compared with other records. A combination tag appears only when every required part of that combination is detected. The result is a search aid, not a guarantee that every named tool is equally central to the delivery scope.

Commercial format

The current format label is Hiring, meaning an employment-oriented search for an individual contributor or team member. Leadiy uses this shared taxonomy so technology hubs can show whether demand arrives as delivery work, capacity, procurement or employment. Classification does not resolve contract law, worker status or platform terms, and it should not be read as an endorsement of eligibility. A timing signal is present as “November 2026 target; no application deadline published,” but the source should be checked before treating it as a live deadline.

Reading the budget

The published budget field reads “$10,000.” Leadiy preserves that wording because a fixed amount, range, hourly rate, daily rate and salary cannot be safely collapsed into one comparable number. Taxes, platform fees, currency conversion, milestones, scope changes and payment terms are not inferred. It remains an opening constraint rather than a valuation of the work. Confirm the unit, currency, inclusions and payment schedule at the source before using it for a proposal.

Demand context from Hiring Pulse

In the current 30-day Hiring Pulse, React appears in 357 of 1360 observed opportunities (26.3%). Counts are multi-label, so one opportunity may contribute to several technology buckets. Hiring Pulse is the contextual layer Leadiy adds beyond aggregation. It places the record against a verified observation window while keeping counting rules visible: technologies can overlap, the feed is not a census, and sparse groups are not disclosed as exact numbers. This evidence can support prioritization, not a forecast. The record still needs source-level verification, and the aggregate view deliberately omits direct leads, personal information, private outreach content and arbitrary micro-segments that could reveal too much.

Observation and publication timing

The first-observed timestamp is 9 Sept 2026, 15:49 UTC, which makes this record 15 days old when this page is rendered. Public release waited 31.17 hours, selected deterministically between 24 and 48 hours from the record identifier. That rule survives process restarts and does not drift with each request. It also separates two clocks that are easy to confuse: the source may have published earlier, whereas Leadiy records when its own system first saw the opportunity. Paid access is to the earlier matched feed, not to a claim about the source’s original posting time.

What looks similar

Similarity is based on shared normalized technology tags and then recency, not on company identity or copied source prose. "Enterprise AI Operations Console — 13-module MVP", "Full-stack AI document-processing and RAG MVP", "Local AI business operating system for defense and aviation workflows" These neighbours are useful for comparing delivery shape, budget visibility and technology overlap. They are not duplicates and they do not imply that the same buyer, scope or qualification rules apply. When no suitable public neighbour exists, the page says so instead of padding the section with unrelated links. New public records can change this comparison set after their own delay and quality checks pass.

Where the response goes

This page’s action route is explicit: it opens Upwork on upwork.com. Leadiy provides context and provenance, not an application proxy. A click can therefore lead to a third-party login or proposal workflow governed by that service’s own privacy, eligibility and payment rules. The public catalog never replaces those instructions and never publishes a hidden email address as an alternate route. Review the destination hostname, confirm that the opportunity is still active, and respond only through a path you trust.

Public evidence versus earlier access

The product promise stays deliberately plain: the same opportunities, one day earlier. Public visitors can inspect this delayed record without an account, but the private product exists for earlier matching and action. Neither route changes the buyer’s requirements, the third-party application flow or the probability of winning work. The value difference is lead time and workflow. Keeping that claim next to a useful, self-contained public page avoids a teaser model in which essential provenance or the true destination is withheld.

Source job details

What this signal says

How the technology was normalized

Commercial format

Reading the budget

Demand context from Hiring Pulse

Observation and publication timing

What looks similar

Where the response goes

Public evidence versus earlier access