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SellerKey
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Open positions

SellerKey is a small remote team based in the EU. We build profit and inventory tools for Amazon sellers. Open roles are listed below.

The application form is under construction. For now, email jobs@sellerkey.co with the role in the subject line. Attach a CV or a link to your work.

Senior Full-Stack Engineer

TypeScript, Next.js and Postgres. You own features end to end, from SP-API ingestion to the screen.

EngineeringRemote, EU time zonesFull-time41 applications received
OpenApply
Posted Sep 8, 2026

Apply by Oct 9, 2026

SellerKey reads an Amazon seller's account through SP-API and the Ads API, stores it in Postgres and shows net profit by product, country and day. Screens never call Amazon live: they read precomputed rollups. You will work on both sides, the nightly ingestion and the screens that read from it, with the founder and one other engineer.

Responsibilities

  • Build features end to end: migration, ingestion job, read model, API route and screen.
  • Keep every read route under 500 ms at p95 with hundreds of SKUs per seller.
  • Design ingestion jobs that can run twice without duplicating or corrupting data.
  • Add logging and checks so a failed sync is visible, never silent.
  • Review pull requests and write short design notes before large changes.

Requirements

  • 5+ years shipping production web software, 3+ with TypeScript.
  • Next.js App Router, React Query and Zod in production.
  • Solid Postgres: indexes, query plans, row-level security, migrations that do not break a live app.
  • Experience with rate-limited third-party APIs and async job queues.
  • Written English. Spanish is a plus.

Nice to have

  • Amazon SP-API or Ads API, or having sold on Amazon.
  • Supabase and Vercel.
  • Financial or accounting data.

What we offer

  • Remote within EU time zones, flexible hours, async by default.
  • 25 days of paid leave plus local public holidays.
  • Hardware budget and a yearly allowance for courses and conferences.
  • Small team: your work reaches sellers the same week.

Process

We reply within five business days. Then a 30-minute call, a short practical exercise related to the role, and a final call with the founder. Two to three weeks from first email to offer.

Data Engineer, Amazon SP-API

Reports, rate limits and reconciliation against Seller Central. You keep the warehouse correct for hundreds of sellers.

EngineeringRemote, EU time zonesFull-time23 applications received
OpenApply
Posted Sep 15, 2026

Apply by Oct 16, 2026

Every number SellerKey shows comes from Amazon reports: Sales and Traffic, financial events, inventory, fees and Ads. Amazon delivers them asynchronously, with per-marketplace differences, late corrections and tight rate limits. Your job is that the warehouse matches Seller Central to the cent for every connected seller.

Responsibilities

  • Own the report pipeline: request, poll, download, parse and load, with dedupe by fingerprint.
  • Schedule work across hundreds of sellers and marketplaces within Amazon's token-bucket limits.
  • Build data checks that compare our tables against a second source and alert on drift.
  • Precompute rollups so screens never scan fact tables.
  • Document each report's quirks with links to the official documentation.

Requirements

  • 4+ years in data engineering or backend work on data-heavy systems.
  • Advanced SQL and Postgres, including partitioning and query tuning.
  • TypeScript or Python for pipelines.
  • Experience with asynchronous, rate-limited APIs and retry design.
  • You check numbers against a second source before calling something done.

Nice to have

  • SP-API reports, Data Kiosk or the Amazon Ads API.
  • Multi-currency and time-zone handling in financial data.
  • pg_cron, Supabase or Vercel Cron.

What we offer

  • Remote within EU time zones, flexible hours, async by default.
  • 25 days of paid leave plus local public holidays.
  • Hardware budget and a yearly allowance for courses and conferences.
  • A real multi-marketplace account to test against from day one.

Process

We reply within five business days. Then a 30-minute call, a short practical exercise related to the role, and a final call with the founder. Two to three weeks from first email to offer.

Product Designer

Dashboards and tables with dense financial data. Figma to production, working directly with the engineers.

ProductRemotePart-time67 applications received
OpenApply
Posted Sep 1, 2026

Apply by Oct 2, 2026

SellerKey's screens are tables and widgets with many numbers: profit by product, fees by marketplace, stock coverage. The job is making that dense data readable at a glance without hiding anything, and keeping one design system across the app, the landing site and the emails.

Responsibilities

  • Design new modules and widgets in Figma from a written spec and real data.
  • Maintain the widget kit: tokens, components, states, light and dark themes.
  • Define table behaviour: sorting, density, sub-rows, empty and loading states.
  • Review implemented screens against the design and log the differences.
  • Run short sessions with sellers to test flows.

Requirements

  • 4+ years designing B2B or data-heavy products.
  • Portfolio with tables, dashboards or financial tools.
  • Fluent in Figma with variables and component libraries.
  • Able to read HTML and CSS and discuss implementation with engineers.
  • English. Spanish is a plus.

Nice to have

  • Having used Seller Central, Helium 10 or similar tools.
  • Basic knowledge of accessibility standards.
  • Motion or illustration for the landing site.

What we offer

  • Part-time, about 20 hours per week, remote.
  • Flexible schedule, async by default.
  • Figma and hardware budget.
  • Option to move to full-time in 2027.

Process

We reply within five business days. Then a 30-minute call, a short practical exercise related to the role, and a final call with the founder. Two to three weeks from first email to offer.

Seller Support Specialist (EN/ES)

First line for seller questions about fees, reports and connections. Amazon selling experience preferred.

SupportRemote, EU time zonesFull-time78 applications received
Closed
Posted Jul 14, 2026

Closed Aug 11, 2026

Sellers write to us about a number that does not match Seller Central, a marketplace that stopped syncing or a fee they do not understand. You answer within one business day, reproduce the issue with the seller's data, and hand confirmed bugs to engineering with the steps to reproduce.

Responsibilities

  • Answer support email in English and Spanish within one business day.
  • Reproduce reported issues and triage them: usage, data or bug.
  • Write and maintain help articles from real questions.
  • Track recurring questions and report them weekly to product.
  • Help new sellers through onboarding and Amazon authorization.

Requirements

  • 2+ years in customer support for a software product.
  • Experience selling on Amazon or supporting Amazon sellers.
  • Fluent written Spanish and English.
  • Comfortable reading a report export and a table in a database viewer.
  • Patient and precise in writing.

Nice to have

  • Seller Central reports and FBA fees.
  • A third language: German, French or Italian.
  • Basic SQL.

What we offer

  • Remote within EU time zones, full-time.
  • 25 days of paid leave plus local public holidays.
  • Hardware budget.
  • Training on the product and on SP-API data.

Process

We reply within five business days. Then a 30-minute call, a short practical exercise related to the role, and a final call with the founder. Two to three weeks from first email to offer.

Content Writer, Amazon FBA

Guides and news for the blog in English and Spanish, sourced from Amazon's official documentation.

ContentRemoteFreelance52 applications received
Closed
Posted Jun 23, 2026

Closed Jul 21, 2026

The SellerKey blog publishes guides on fees, reports and profit for Amazon sellers, and news when Amazon changes something. Every article cites the official source. You write in both languages and work with an editor who checks facts against the documentation.

Responsibilities

  • Write 4 to 6 articles per month in English and Spanish.
  • Research each topic in Amazon's official documentation and cite it.
  • Update existing articles when Amazon changes a fee or a program.
  • Propose topics from seller forums and support questions.
  • Deliver clean drafts in Markdown with images described.

Requirements

  • 3+ years writing for the web on e-commerce or finance topics.
  • Fluent written English and Spanish.
  • Experience with Amazon FBA as a seller, agency or writer.
  • Ability to read a fee table and explain it plainly.
  • SEO basics.

Nice to have

  • Amazon Ads or Brand Registry topics.
  • Spreadsheets for worked examples.
  • Published Amazon-related articles.

What we offer

  • Freelance, per article, with a monthly volume agreed in advance.
  • Remote, flexible schedule.
  • Byline on every article.
  • Long-term collaboration if the first quarter works.

Process

We reply within five business days. Then a 30-minute call, a short practical exercise related to the role, and a final call with the founder. Two to three weeks from first email to offer.