Experienced Full Stack Marketplace Engineer – Customer & Partner-facing at arenaflex

Join arenaflex, a scale-up that still ships like a startup, and invests heavily in developer experience, as we revolutionize the way frontline workers connect with the tools they need to do their best work. Our open Marketplace and modern extension points (APIs, webhooks, Embedded Apps, iPaaS connectors) let customers tailor arenaflex to any workflow, from shift scheduling to AI-powered language translation. As a Marketplace Engineer at arenaflex, you will be at the heart of our iteration cycle, working closely with customers and partners to co-innovate and deliver fully integrated solutions. You will have the opportunity to travel onsite to co-innovate with our customers in Europe and North America, and then work with our internal teams to turn these solutions into valuable offerings available in our Marketplace. This role is a rare opportunity to accelerate your engineering career, working with senior leadership and opening the doors towards difficult-to-land roles such as architect, product manager, or tech lead.

Your Responsibilities:

* Co-innovate with customers: Translate customer needs into use cases to deliver fully integrated solutions.

• Rapid prototyping: Build proof-of-concept integrations using Embedded Apps, Authenticated Links, public APIs, webhooks, iPaaS tools, and AI Agents.
• Partner enablement: Moderate workshops with customers and ISVs, mentor our partner's developer teams, and work with our product teams to improve our API extension points based on feedback.
• Developer evangelism: Create plug-and-play integration templates, sample connectors, and code snippets for our ecosystem; publish how-to articles, take part in webinars, and speak at community events to showcase best practices.
• Innovation scouting: Collaborate with strategic partners to test emerging tech, such as agentic AI capabilities: autonomous LLM agents that plan, decide, and act through arenaflex APIs; retrieval-augmented copilots that surface knowledge on demand.
• Field feedback loop: Travel (up to ~1 week/quarter) to customers or events to innovate together and ship fast.

What We Look for in You:

* 5+ years customer-facing experience in a technical role (engineering, presales, technical solutions, etc). Proven experience working with technical partners or ISVs.

• Strong communication skills in English (verbal and written).
• Get-it-done mindset: Bias for action, ability to self-prioritize without waiting for PM/UX direction.
• Full-stack fluency: Proficient in at least one backend technology such as Java, Python, Node, or Ruby, and either have experience with frontend technologies like TypeScript and React or are eager to learn them. Familiar with REST/GraphQL APIs and OAuth flows.
• Ability to travel up to ~1 week/quarter to customers, partners, or events.

Bonus Points:

* Published apps on Slack, Teams, Shopify, Atlassian, or similar marketplaces.

• Experience with iPaaS platforms (Workato, Zapier, Make).
• Knowledge of workforce-tech domains (scheduling, payroll, HR systems, etc.).

What We Offer:

* Competitive salary

• Phone and Home Internet costs reimbursement up to 80 PLN/month
• Private health care package with Luxmed – covered for you and partially for your partner/family
• Cafeteria benefits – monthly budget to cover sport cards or other purchases
• Creative Allowance – paid as 1000 PLN gross/month
• Home office set-up reimbursement up to 1000 PLN
• Personal Learning and Development Budget of 1500 USD/year
• Sabbatical Program – 1 month paid leave at 3, 6, 10 year tenure
• 26 days of annual leave/year
• 2 Mental Health days off per year

Benefits listed above are part of the compensation package for a contract of employment.

Who We Are:

arenaflex believes in the potential of every single employee. That's why we've built the essential platform for frontline workers. We help organizations digitally enable their frontline, to boost productivity, quality, and safety, and be more agile. Check out our Technology Blog for latest articles.

Diversity and Inclusion:

At arenaflex, we celebrate diversity! All qualified applications will receive consideration for employment regardless of race, color, ancestry, religion, nationality, sexual orientation, age, citizenship, marital status, disability, or gender identity. We are committed to ensuring a smooth application process for all candidates. If you require accommodations due to a disability, please reach out to [email protected], and our team will be more than happy to assist you. Please know that you are not required to share your nationality, age, or a picture of you on the CV! We are looking forward to your application!

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