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Full Stack Developer - Frontend Focus (m/f/d)

Leipzig
Full-time
Permanent employee

Introduction

At Optimax Energy, we have been developing smart solutions for automated trading systems and promoting the transition to green energy for over 10 years. This makes us a leader in international electricity trading.
Our culturally diverse team shares a common vision and fosters a culture of appreciation and equal opportunities. We believe that we can achieve extraordinary things if we develop freely. That's why we place great value on a healthy work-life balance and encourage creative freedom.
We embrace diversity, equality and inclusion. Different perspectives and backgrounds strengthen our team and lead to creative solutions. To achieve this, we create an appreciative working environment that recognizes the uniqueness of all employees and retains talent in the long term.
To actively shape the future of the energy sector, we are looking for outstanding, committed individuals who share our vision and corporate culture.

Your responsibilities

Our WTC (Web Trading Center) team builds the platform our traders work in every day — the near real-time dashboard that turns Optimax's algorithmic trading into something people can see, understand and act on. Every live data stream, every chart and every interface decision shapes how confidently our traders move in fast, volatile energy markets.As a Fullstack Developer with a frontend focus in this team, you'll lead the frontend while growing into the backend, owning how the platform looks, feels and performs under real-time load. You will: 
  • Drive our frontend development and shape the architecture of our frontend monorepo.
  • Build new analytical and trading UI components such as dashboards and live charts that stay fast and reliable under high load.
  • Maintain and refactor the UI of our existing platform and continuously raise the bar on quality and UX.
  • Run code and architecture reviews and help define how our frontend evolves.
  • Grow into our backend (Kotlin/Eclipse Vert.X) along a structured learning path and with a dedicated mentor, contributing step by step to API implementation, performance improvements and microservices’ deployment into Kubernetes.
  • Take an active part in team life: refinements, planning, and knowledge sharing.
  • Bring ideas to the table and actively look for better ways to build our product, our code and our processes.

Status Quo

We work with the following tech stack:
  • Frontend: React, TypeScript, Vite, PNPM, TanStack Store / Redux, Ant Design, Nginx.
  • Backend: Kotlin, Eclipse Vert.X, Maven, MySQL, ClickHouse, MongoDB, Redis, RabbitMQ, Keycloak; real-time data via STOMP over WebSockets and R Sockets.
  • CI/CD: Docker, GitLab, Jenkins, Kubernetes.
  • Monitoring: Micrometer, Grafana, Graylog.

Your skills

Must-Haves:

  • At least 5 years of professional software development experience.
  • Strong frontend skills with React, TypeScript, Vite, NPM and TanStack Store or Redux.
  • Mastery in web technologies (e.g. HTML5, CSS-in-JS, CORS, REST, JWT)
  • Degree in computer science, information technology or comparable field of study.
  • Experience with real-time data visualization using streaming protocols (e.g. STOMP, SSE, gRPC, WAMP).
  • Experience developing and maintaining platforms with dynamic components such as dashboards and charts, including UI rendering under high load.
  • Experience with Docker.
  • Experience with unit testing (e.g. Vitest) and integration testing (e.g. Cypress).
  • A genuine desire to grow into backend development, backed by first hands-on experience or solid theoretical knowledge in Java, Kotlin or a similar language.
  • Clear and concise communication in English (at least B2), whether in code reviews, refinements or with stakeholders.
  • Residence in Germany and a valid work permit.

Nice-to-Haves:

  • Experience with Kubernetes and Jenkins.
  • Experience with Kotlin
  • Understanding of relational and NoSQL databases.
  • Experience writing SQL queries.
  • Background in energy markets or trading.
  • A good eye for UX.

What we offer

  • Salary: 65,000 – 75,000 € / year — depending on your experience and background.
  • Health & well-being: 
    • Freshly cooked lunch every day  
    • Massages in the office 
    • EGYM Wellpass 
    • Sports and mobility offers, such as subsidies for a new bike
    •  Company health insurance that gives you access to additional healthcare services

  • Flexible working arrangements and benefits: 

    • 30 days paid vacation 
    • Flexibility in working hours
    • Additional vacation for the honeymoon 
    • Subsidies for childcare 

  • Team culture and working atmosphere: 

    • Regular team events (game night, table tennis tournament, excursions, etc.) 
    • Work in a mission-oriented, international team that values diversity and equality 
    • Working atmosphere with open doors and flat hierarchies 
    • Modern, green office in the heart of Leipzig 
  • Professional development and further training: 
    • Independence and responsibility in project management 
    • 10% of weekly working time for personal and professional development


Have we convinced you?
Then please send us the following application documents:
  • Curriculum vitae
  • Grades & Uni Report (if you finished relevant studies in the last 5 years)
  • Relevant References, certificates (optional)

ABOUT OUR APPLICATION PROCESS
We take the time to get to know each other properly. Our process has four steps:
  1. Intro Interview with People & Culture
  2. First technical interview with live coding task
  3. Second technical interview about system design, architecture, collaboration
  4. Final interview with our CEO’s
You can find our application process in detail HERE - take a look