Sr. Backend Developer (Python)

Your mission

• Build and improve backend services and APIs using Python and FastAPI

• Help shape our architecture as the platform grows, keeping things simple, reliable, and easy pleasant to work with

• Own projects from idea to production and stay involved through monitoring, iteration and improvements.

• Work closely with product and frontend teams to ship features that feel natural in the wider system.

• Improve reliability, performance, and general quality of the backend over time

• Investigate issues across services and environments, keeping outages small and learning focused

• Mentor teammates, share knowledge, and contribute to a healthy engineering culture

• Join technical discussions, propose solutions, and help guide decisions across the team

Your profile

• 7+ years of experience building backend systems with Python

• Strong at designing APIs, backend architectures, and clear service boundaries

• Able to break down problems and design maintainable, scalable solutions

• Comfortable working with relational and NoSQL databases

• Solid Linux or Unix knowledge

• Familiar with Kubernetes and cloud environments like AWS

• Good communicator who works well with product and other engineers

• Experienced in mentoring and guiding teammates

Bonus points

• Experience breaking down monoliths, applying the strangler pattern, or extracting services cleanly

• Familiarity with DDD, hexagonal architecture, and other domain oriented design approaches

• Strong grasp of Python internals, performance tuning, or advanced language features

• Experience improving observability across services, including metrics, logs, and tracing

• Experience with event-driven systems or message based integrations

• Good product instinct and ability to make engineering decisions based on business impact

Why us?

Work with real impact
Join a mission-driven sustainability-tech company where your work delivers measurable results. You help corporations identify, prioritize, and monitor ESG risks and opportunities that truly matter.

Fair, transparent compensation
A yearly reviewed salary, aligned with the market median, and a defined growth range so you always know how your role and compensation can grow.

A truly diverse, international team
Work alongside colleagues from more than 25 nationalities, with a genuine 50/50 gender balance across the company. Different perspectives make better decisions.

Flexibility that respects your life
Design your weekly schedule together with your team. We trust you to organize your time and focus on outcomes, not hours.

Daily food perks
11€ per working day as a meal allowance, plus food and snacks at the office to fuel collaboration and shared moments.

Wellbeing beyond work
Fitness allowance or access to Urban Sports, because taking care of yourself is key to building something sustainable together.

Support for growing families
Monthly kindergarten stipend for parents with children under 3 years old, because peace of mind at home makes a real difference at work.

Health and pension plan
Private health insurance for you and your family, plus a pension plan where the company matches and doubles your personal contributions.

Continuous learning culture
Frequent training, a dedicated conference budget, and full access to O’Reilly so you can keep raising the bar and stay at the top of your craft.

Equipment that fits your way of working
Choose the setup that works best for you (Mac or Linux), so nothing slows you down.

About us

Join Datamaran: The Pioneers of Smart ESG Solutions.

At Datamaran, we are revolutionising how the world's most influential companies navigate their Environmental, Social, and Governance (ESG) responsibilities. Our AI-powered SaaS platform empowers organizations to integrate ESG into their core strategies, driving meaningful impact at scale. Trusted by global industry leaders like Bridgestone, Dell, Kraft Heinz, Cisco and PepsiCo, and endorsed by leading regulators in Europe and North America, Datamaran is at the cutting edge of ESG technology.

Since 2014, we've been on a mission to deliver world-class solutions that enable businesses to align with stakeholder expectations, meet regulatory requirements, and enhance their ESG performance. Our platform helps senior executives make data-driven, evidence-based decisions, simplifying complex ESG challenges with clear, actionable insights. Whether it's ensuring compliance or presenting a compelling ESG narrative to investors and boards, Datamaran is the trusted partner for sustainable businesses.

Our commitment goes beyond technology. We are deeply embedded in the global ESG community, hosting and sponsoring events, partnering with universities and service providers to address the skills gap, and running educational programs that connect forward-thinking leaders. We've produced an award-winning documentary series, New Heroes of Sustainable Business, highlighting visionary leaders shaping a more sustainable future to inspire others across industries and regions.

We're not just building cutting-edge technology and ESG-focused communities but a diverse, global team united by a shared passion for innovation, collaboration, and continuous learning. With over 100 team members across the UK, US, Spain, and the Netherlands, we bring unique perspectives and skills together to solve the ESG challenges of tomorrow, today. At Datamaran, we believe in empowering our people as much as our clients and offer career development and growth opportunities to all.

Following our successful Series C funding round late 2024, we're entering an exciting phase of growth, expanding across all departments and locations to scale our impact worldwide. If you're ready to drive change, inspire innovation, and help businesses shape a sustainable future, we'd love for you to join us.

Find out more about Datamaran's story, people, and culture in this short film: Datamaran 10 Years Video