Senior Backend Developer

Balanz-Energy; Utrecht; On-site; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Pensioenregeling

26 vakantiedagen incl. ADV

Reiskostenvergoeding

Bonusregeling

Job summary

Balanz-Energy zoekt een Senior Backend Developer met meer dan 10 jaar ervaring in het bouwen en schalen van backend-systemen. Je werkt aan AI-gedreven ontwikkelprocessen, waarborgt beveiliging en prestaties en draagt bij aan de betrouwbaarheid van onze systemen.

Locatie is Utrecht, fulltime op kantoor. Je werkt samen met product- en frontend-teams aan bedrijfs-kritische features en mentor andere developers.

Qualifications

• 10+ jaar professionele backend-ontwikkelingservaring.
• Ervaring met architectuur en systeemontwerp.
• Sterke communicatieve vaardigheden in Engels (Nederlands is een plus).
• Ervaring met AI-gedreven ontwikkelingshulpmiddelen zoals Claude Code, Codex of Gemini CLI.

Responsibilities

• Ontwerp en implementeer schaalbare backend-systemen met focus op prestaties, onderhoudbaarheid en beveiliging.
• Maak gebruik van AI-gedreven ontwikkelingshulpmiddelen om ontwikkeling te versnellen en codekwaliteit te verbeteren.
• Werk samen met productmanagers en frontend-ontwikkelaars om kerndiensten te leveren.
• Beoordeel PR's van peers en AI-agenten.
• Zet test-gedreven ontwikkeling (TDD) en uitgebreide tests in de organisatie.

Skills

Golang

Rust

AI-assisted development

TDD / CI/CD

Back-end architecture

Security best practices

Performance tuning

Kubernetes / cloud-native

Distributed systems

English communication

Tools

Claude Code

Codex

Gemini CLI

SQL/NoSQL databases

Git

Job description

Uw rol

We are seeking a Senior Backend Developer with a minimum of 10 years of professional experience building and scaling backend systems. This role requires strong communication skills and technical depth in backend architecture, performance-driven engineering, and secure, maintainable code practices. The ideal candidate will be comfortable working in a test-driven, AI-assisted development environment and will play a key role in shaping the reliability and scalability of our backend systems

• Architect and design scalable backend systems and services with a focus on performance, maintainability, and security.
• Leverage AI-driven development tools (Claude Code, Codex, Gemini CLI, or similar) to accelerate development, improve code quality, and enhance team productivity.
• Collaborate with product managers, frontend developers, and other stakeholders to deliver business-critical features.
• Translate business requirements to AI agent ready technical specifications
• Review PR’s from peer developers and AI agents
• Drive development practices that emphasize test-driven development (TDD) and high-quality, automated test coverage.
• Build, optimize, and maintain relational, key-value and time-series databases ensuring efficient queries, schema design, and scalability.
• Apply security best practices across the stack, ensuring robust protection against vulnerabilities and compliance with standards.
• Monitor and improve system performance (latency, throughput, scalability, resource efficiency).
• Mentor and support other developers, fostering a culture of excellence, learning, and innovation.

Uw profiel

• 10+ years of professional backend development experience.
• Excellent communication skills in English (Dutch is a strong plus).
• Proven expertise in backend architecture and system design.
• Strong proficiency in Golang; experience with Rust is a strong plus.
• Familiarity and experience with AI-assisted development tools (Claude Code, Codex, Gemini CLI, or equivalent).
• Solid background in database schema design, optimization, and advanced queries.
• Demonstrated experience with test-driven development (TDD) and CI/CD pipelines.
• Deep knowledge of security best practices (e.g., OWASP, secure coding standards).
• Hands-on experience with cloud-native environments (Kubernetes, containers, service)
• Knowledge of distributed systems and high data throughput
• Experience in performance tuning and high-throughput, low-latency system design.

Wat we bieden

• Duration:
  • 6 months initially. Upon satisfactory performance, the contract will be immediately converted to a permanent position.
• Probation Period:
  • Not applicable.
• Location:
  • Utrecht (full-time office presence; no hybrid or remote work).
• Working Hours:
  • 38 hours per week plus 2 additional ADV leave hours.
• Holiday Allowance:
  • 8% of annual salary.
• Bonus Scheme:
  • 8% based on company performance and achievement of Balanz’s business objectives.
  • 2% based on personal goals agreed upon with your manager.
• Company Regulations:
  • Will form part of the employment agreement; currently under development.
• Vacation Days:
  • 21 vacation days and 12 ADV days per calendar year, with full salary.
• Sick Leave:
  • 100% salary during the first 6 months; thereafter 80%.
• Pension Plan:
  • Employer contribution: 8%
  • Employee contribution: 4%
• Travel Costs:
  • Public transport: fully reimbursed.
  • Own transport: €0.23 per kilometer.

Over ons

Balanz is a next-generation energy trading company founded in 2025 with a clear ambition: to transform how renewable energy interacts with European power markets. Our mission is to empower wind, solar, and storage asset owners by giving them direct, intelligent access to energy markets through advanced technology and data-driven control systems.

We operate as a licensed Balance Responsible Party (BRP) and will soon expand into Balancing and Congestion Service Provider (BSP/CSP) roles. This means we don’t just trade energy—we actively manage imbalances, optimize flexibility, and create new revenue streams for our partners. Our first market entry will be in the Netherlands in 2026, followed by rapid expansion across Europe. Our long-term vision is to connect thousands of renewable assets and energy suppliers, making renewable energy predictable, profitable, and fully integrated into the power system of the future.