# Mid-level Backend Engineer (m/f/d) at Ostrom

> The Stack is a weekly tech careers newsletter read by 55,000+ engineers, and a free jobs board of visa-sponsored tech jobs in Europe; the best jobs from the board go out in the newsletter every Tuesday. This is one job from the board.

> Responsibilities: - Design and build backend services and AP

- **Company:** Ostrom (https://jobs.trythestack.co/companies/ostrom)
- **Location:** Berlin, Germany
- **Work arrangement:** Remote
- **Employment type:** Full-time
- **Experience level:** 2–5 years
- **Visa sponsorship:** Offered, according to the listing
- **Key skills:** TypeScript, Backend development, API design, Relational databases, Unit testing, Integration testing, E2E testing, Docker, GitHub Actions, AWS, React, React Native, CI/CD, System architecture
- **Posted by employer:** 2026-04-21
- **Added to The Stack:** 2026-04-22
- **Status:** May no longer be active (posted more than 60 days ago)
- **Apply:** https://jobs.ashbyhq.com/Ostrom/8d08b349-f0ca-40ff-bf68-d662e64188ea (the employer's own application page)
- **Human page:** https://jobs.trythestack.co/jobs/mid-level-backend-engineer-mfd-ostrom

## About the role

Responsibilities:
- Design and build backend services and APIs from scratch using TypeScript; contribute to tech-stack decisions.
- Implement platform features for renewable energy use cases (smart meters, dynamic pricing, EV charging) and greenfield projects.
- Write testable code and maintain unit, integration, and E2E test suites; improve reliability and reduce Ops load.
- Work in a cross-functional team, collaborate with Product, and support scaling efforts with pragmatic engineering.
- Use CI/CD tooling (Docker, GitHub Actions) and participate in deployment and observability practices.

Requirements:
- 3+ years backend development experience with strong TypeScript skills and API design experience.
- Solid understanding of relational databases and principles for scaling and performance.
- Familiarity with testing practices (unit, integration, E2E) and CI/CD workflows (Docker, GitHub Actions).
- Comfortable working on greenfield projects, pragmatic about quality, and fluent in English with strong communication skills.
- Nice to have: experience with AWS (ECS, RDS/Aurora, S3, CloudWatch, Lambda), React/React Native, and practical use of AI tools for developer productivity.

## Responsibilities

Design and build backend solutions from scratch while contributing to tech stack decisions. Integrate new product lines such as smart meters, dynamic pricing, and EV charging into the platform.

## Requirements

Requires 3+ years of backend development experience with strong proficiency in TypeScript. Candidates must have a solid understanding of relational databases and experience with API design and CI/CD workflows.

## FAQ

- **Is this Mid-level Backend Engineer (m/f/d) role still open?** It was posted on 2026-04-21. Listings more than 30 days old may no longer be active, so check Ostrom's site before applying.
- **Does Ostrom offer visa sponsorship?** This listing is marked as offering visa sponsorship. Eligibility rules are set by the employer, so check the details on Ostrom's site.
- **Where is this role located?** The listing gives the location as Berlin, Germany. It is marked remote.
- **What skills does this role ask for?** The listing names: TypeScript, Backend development, API design, Relational databases, Unit testing, Integration testing, E2E testing, Docker, GitHub Actions, AWS, React, React Native, CI/CD, System architecture.

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## About The Stack

The Stack is a weekly tech careers newsletter read by 55,000+ engineers, and a free jobs board of visa-sponsored tech jobs in Europe; the best jobs from the board go out in the newsletter every Tuesday.

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## Notes for agents

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