Senior Full Stack Developer Jobs in Quincy, IL (NOW HIRING)

SpringWater is a sister company of Hostinger, and we are looking for a team member to join a role at an acquired company in the affiliate marketing software space. This company is a small but mighty international team with an even mightier goal: turn a strong SaaS product into a growth machine. To achieve that we are looking for a self‑driven, reliable and hard‑working software engineer who understands that great product experience is itself a growth driver.

We’re looking for a generalist who’s comfortable across the stack‑backend, data pipeline, background jobs, and the occasional frontend change. You’ll work closely with the CTO and product team to ship features fast, with fewer meetings and more doing.

• Build and maintain backend features – APIs, background jobs, integrations. Our stack is Ruby on Rails but if you’re strong in Python or TypeScript and willing to learn, that works too.
• Improve and maintain our data pipeline – write reports and queries in PostgreSQL and BigQuery to keep affiliate data (clicks, conversions, commissions, payouts) correct and up to date.
• Build internal dashboards and reports – payout summaries, revenue attribution, cohort breakdowns, etc.
• Fix performance issues – bad queries, slow background jobs, bottlenecks. Keep things running well under load.
• Use AI tools (Claude Code, Cursor) daily to move faster. We care about what you ship, not how many hours you sit.
• Work async with a small team – few meetings, lots of ownership. You ship it, you monitor it.
• Jump in on technical support. We rotate who handles deeper technical help for our CX team – running custom scripts, debugging client‑specific issues, or digging into the data when something looks off.

• 5+ years of backend engineering experience, with strong proficiency in Ruby on Rails, or solid Python/TypeScript skills with a genuine willingness to learn our stack.
• Strong SQL skills, including writing complex queries, optimizing slow queries, and working with both PostgreSQL and BigQuery in production environments.
• Experience building and maintaining REST APIs and background job systems (e.g., Sidekiq, Celery, or similar), with an understanding of reliability, retries, and failure handling.
• Experience building internal tooling and dashboards – revenue reports, payout summaries, cohort analyses, or similar business‑facing data products, ideally tied to financial or affiliate data.
• Async‑first, high‑ownership work style – comfortable communicating through written updates, making independent decisions, and taking full responsibility for features from build through monitoring.
• Practical experience using AI‑assisted development tools (such as Cursor, Claude Code, GitHub Copilot, or similar) as a regular part of the development workflow to increase output quality and speed.

• Data or analytics engineering background – prior work with data pipelines, event tracking, affiliate/conversion data, or analytics engineering is a meaningful differentiator for this role.
• Familiarity with dbt (data build tool) for building and maintaining data transformation models, or a strong desire to learn it quickly in the context of analytics and reporting.

• Real impact: High‑impact ownership in a small team working closely with leadership – your work is visible, directly shapes growth. You influence decisions and priorities, not just execute tasks.
• Growth ownership: High autonomy over your domain, with the trust and resources to execute well.
• Flexibility: Remote‑first setup – work where and how you’re most effective.
• Growth support: Real room to grow, with a learning budget to improve execution.
• Flat structure: Direct access to decision‑makers, and the ability to influence direction without layers of approval.

Gross salary from 5500 Eur/month, depending on your experience and skills.