Senior Backend Developer

🚀 We're looking for an ambitious, self-driven Senior Backend Developer to join our engineering team. You'll work primarily with TypeScript and AWS serverless technologies, with occasional work in our React/Next.js frontend. A growing part of our platform is integrating with enterprise customers and external systems, so you'll design and own APIs and integrations that need to hold up under real-world use. This is a high-impact role with end-to-end ownership, from requirements to a production-ready solution, and a chance to contribute meaningfully to the green transition.

🛠️ What You'll Be Doing Taking features from design through implementation and into production

Building and operating event-driven, distributed systems - async processing, retries, failure handling, idempotency

Designing APIs and integrations for enterprise and external systems - stable contracts, versioning, auth, error handling, backwards compatibility

Working in and improving our existing codebase - refactoring, automated testing, managing technical debt

Occasional frontend work in React/TypeScript

🧠 Your Experience 3 to 5+ years of professional software development, with substantial recent experience in TypeScript/Node.js and AWS serverless or event-driven architectures

Strong hands-on experience with AWS services - Lambda, DynamoDB, queues, event buses, API services, infrastructure as code

Experience with NoSQL data modelling and production data systems

Good understanding of authentication, authorization and application security

Experience operating production systems - debugging, monitoring, safely deploying changes

Comfortable with Git-based workflows and CI/CD

Some React/TypeScript experience, and willingness to make occasional frontend changes

✅ What We Expect at Senior Level You can independently take a feature or technical problem from requirements to a production-ready solution. You're comfortable navigating unfamiliar code, understanding the blast radius of a change, and making pragmatic calls between delivery speed, reliability and maintainability. You think carefully about system boundaries and integration contracts, understanding that APIs used by customers and external systems need to evolve safely and behave predictably when either side fails. You understand rollback, backwards compatibility, failure modes and safe deployment for systems handling production data. You communicate trade-offs clearly and take responsibility for the quality of what you ship. You're comfortable using AI-assisted development tools as part of your day-to-day work, and curious about how they can improve how software is designed, built, tested and maintained - not just for code generation, but for understanding unfamiliar code, planning changes, testing, reviewing, debugging and documentation. At the same time, you apply strong engineering judgement: you treat AI-generated output as a draft to review and validate, and you remain responsible for the correctness and security of what you ship.

🌟 Nice to Have Enterprise integrations - SSO/federated identity, webhooks, customer-facing APIs

AWS CDK or similar IaC tooling

DynamoDB single-table or composite-key modelling

IoT, connected devices, telemetry or high-volume event processing

Multi-tenant SaaS platforms

Energy tech, EV charging, batteries, solar or energy management

Data platforms, analytics or data lakes

ISO 27001 or NIS2 experience

Next.js

You don't need experience with every technology in our stack. We value strong fundamentals and the ability to learn unfamiliar domains fast.

🌆 What Is It Like to Work at FLEXECHARGE? Our office sits in Frederiksberg - bright, comfortable, and a genuinely nice place to spend your workday

You're covered with pension contributions

Lunch is on-site, delicious, and genuinely healthy and nutritious

We like each other's company outside of work too, so think Friday bars, plus company team events and team buildings on a team level

Opportunities for individual development

🤝 Our Interview Process Here's roughly what happens once we've had a look at your application: A first conversation, about 30 minutes, you'll talk with our recruiter, get a feel for the role, ask whatever's on your mind, and we'll both get a sense of whether this is worth pursuing further

Time with the team - a conversation with Artur, our Head of Engineering, and Robert, our CTO

A technical stage - one or more interviews with the team, which may include a case exercise and follow-up discussions. These can take place remotely or at our office.

A conversation with Max, our CEO, alongside someone else from the team

Hiring carefully matters to us - we want to get to know you properly, and we want you to get a real feel for us too. If there's anything we can do to make the process work better for you, tell us. We'd love to hear from you.

📍 Location & Practical Details This is an on-site role based in Copenhagen. Only candidates currently located in Copenhagen, or those who clearly state in their application that they plan to relocate, will be considered. Please note: We do not offer visa sponsorship for this role

We do not offer relocation services

🔐 Data Privacy (GDPR) Applications for this role are processed exclusively through The Hub (thehub.io), our recruitment platform, in accordance with their privacy policy and applicable GDPR requirements. FLEXECHARGE does not process or store candidate data in any of its own internal systems. Your data will be handled confidentially and used only for this recruitment process.