Backend Engineer - Duomo

[https://app.ashbyhq.com/api/images/user-content/586ac3cb-f234-40cf-96fd-3daae8c41309/3a2721ac-0cf6-4bb5-a785-483b8d1018c3/Ashby_header.png] What should you know about SKELAR? It's a venture builder — in other words, a company that builds companies. Together with founders, we create consumer businesses that become leaders in global markets across EdTech, Mental Health, Petcare, FashionTech, and beyond. Our teams build tech products that win recognition from Product Hunt and The Webby Awards, earn thousands of glowing Trustpilot reviews, and reach over 10 million users worldwide. That kind of impact doesn't happen by accident — it starts with exceptional people, and our people are our top priority. We've built an environment where expertise meets opportunity, and where there's no ceiling on what you can achieve. Now we're looking for the kind of people who don't just want a job — they want a challenge. We’re looking for a Middle Node.js Developer for our partner company, Duomo. Duomo is an app rooted in Christian values, helping people turn Scripture into daily habits and inner peace. We’re building a leading Christian-tech product for people seeking spiritual renewal. You will be responsible for: - Driving MarTech Automation: Designing, developing, and scaling backend services to automate marketing technology processes and integration workflows. - Streamlining Creative Processes: Building robust tools and systems that automate the asset lifecycle and streamline creative operations for the team. - Enhancing System Observability: Implementing comprehensive tracking, metrics, logs, and tracing (Observability) to ensure high system visibility and performance monitoring. - Strengthening Infrastructure Reliability: Expanding test coverage (unit, integration, end-to-end) and setting up automated testing pipelines to ensure high code quality and fault tolerance. - Architecting Scalable Solutions: Participating in system architecture design, code reviews, and optimizing backend performance to support business growth. What you need to succeed in this role: - 2+ years of experience with Node.js + TypeScript & NestJS. - PostgreSQL + any typed ORM (Drizzle, Prisma, or TypeORM). - Redis & Message Queues (BullMQ, RabbitMQ, or SQS) — hands-on experience with idempotency, retries, and distributed locks. - Third-party REST API integrations — handling rate limits, pagination, and partial failures. - Docker, CI/CD, and unit testing with Jest Nice-to-Have Requirements - Experience with Facebook Marketing API, Google Ads API, or other ad platforms (TikTok, Applovin) - Cloud & Infra: AWS (ECS, ECR, S3, Lambda) and GitHub Actions - Observability: Prometheus, Grafana, and structured logging - Integrations with Airtable API and Google Sheets API - Practical experience with LLM APIs (Claude, Gemini) — structured output and prompt versioning Why Duomo: — You’ll work on a product with a clear mission and real values. — You’ll help us transition from a content-rich app into a truly connected spiritual platform. — You’ll be early enough to influence how product is done at Duomo long-term. What we offer: — Competitive salary; — Significant impact on a rapidly growing business and contribution to how it shapes up; — Ample career opportunities for ambitious growth and development; — A possibility to attend internal, external courses, seminars and the access to a corporate library; — Comfortable working environment. We provide all necessary work equipment for your role and serve complimentary breakfasts, lunches, and snacks in the office; — 20 days of paid vacation, medical insurance and a variety of sports activities available for employees inside and outside the office. At SKELAR, we've built an environment where people can grow, build, and do the most meaningful work of their careers: - SKELAR Platform. The operational backbone of our venture builder. It exists to help founders move faster and easier — so business teams can stay laser-focused on the product