Software Backend Engineer, SaaS product (Python) - Greenstep Espoo/Vantaa

Greenstep; Vantaa; Hybrid; EUR 65,000 - 90,000; Full time

Benefits offered by this job

Flex benefits

Lunch discount

Together bonus (10% profit share)

Greenstep Academy training

Well-being program

Job summary

Greenstep is hiring a Backend Engineer in Finland to design and implement AI-enabled backend services. You will ship REST APIs in Python/FastAPI and build agent workflows with LangChain/LangGraph, collaborating with data and frontend teams.

Hybrid work culture with a strong emphasis on quality, testing, and observability. You will work closely with the product owner to drive scalability and AI/MCP roadmap, influencing architecture and delivering robust, production-grade software that connects

Qualifications

• 3+ years professional Python backend development, including async programming.
• OOP and clean service architecture.
• REST API design (FastAPI).
• ORMs & migrations (SQLAlchemy, Alembic).
• Practical AI agent building — LangChain/LangGraph.
• Testing discipline: unit/integration/API tests, mocking LLM calls.
• Docker (containerization — no orchestration ownership).
• Basic CI familiarity.
• Excellent English, Finnish is preferred.

Responsibilities

• Design and develop backend services and REST APIs in Python/FastAPI, including agentic workflows built with LangChain and LangGraph.
• Build and expose tools/agents via MCP (FastMCP).
• Build features and APIs on top of consolidated semantic-model and gold-layer data — turning data into product, not just serving it up raw.
• Design database schemas and migrations (SQLAlchemy & Alembic).
• Write asynchronous, production-grade Python, with solid test coverage including mocking LLM/agent calls.
• Containerize services with Docker for local dev and deployment — you won't own Kubernetes or infra, but your services need to ship clean.
• Instrument agent behavior with real observability, so non-deterministic failures are debuggable, not mysterious.
• Use AI coding tools to move faster, with engineering judgment intact.

Skills

3+ years Python backend

Async programming

OOP & clean architecture

REST API design (FastAPI)

Testing (unit/integration)

CI/CD familiarity

English proficiency

Finnish preferred

Tools

Docker

SQLAlchemy

Alembic

LangChain

LangGraph

FastAPI

Job description

Greenstep is a growing, global group helping thousands of companies in Europe to grow through clarity. We are a technology-oriented company with Finnish roots, founded in 2010. In addition to Finland, we currently operate in Sweden, Norway, Estonia, Denmark, and the Netherlands. Our team of around 800 experts consists of seasoned professionals in areas such as accounting, CFO services, financial management, HR, analytics, ERP and CRM technologies, payroll, as well as tax and legal services. We are an agile growth company, and our service offering continuously expands in line with our customers’ evolving needs.

The Role

Our platform consolidates client operative business data into a single place and turns it into real product capability — BI on Power BI, integrations, AI/Copilot, MCP, and features built directly on top of semantic models and gold-layer data, not just raw access to it. As a Backend Engineer, you'll build the AI and agent layer that makes that possible: designing backend services and APIs in Python/FastAPI, building and orchestrating AI agents with LangChain/LangGraph, and exposing them through MCP — a genuine strategic bet for us, not a checkbox. You'll own the service, API, and agent layer end-to-end, from design through deployment, working closely with our data team (who own the medallion architecture and warehouse modeling) and a dedicated frontend team. You'll sit close to the product owner driving our scalability and AI/MCP roadmap, with real influence over how agentic features get architected — this is a build role, not a maintain-what-exists role.

You will

• Design and develop backend services and REST APIs in Python/FastAPI, including agentic workflows built with LangChain and LangGraph.
• Build and expose tools/agents via MCP (FastMCP).
• Build features and APIs on top of consolidated semantic-model and gold-layer data — turning data into product, not just serving it up raw.
• Design database schemas and migrations (SQLAlchemy & Alembic).
• Write asynchronous, production-grade Python, with solid test coverage including mocking LLM/agent calls.
• Containerize services with Docker for local dev and deployment — you won't own Kubernetes or infra, but your services need to ship clean.
• Instrument agent behavior with real observability, so non-deterministic failures are debuggable, not mysterious.
• Use AI coding tools to move faster, with engineering judgment intact — we want a builder who uses AI well, not one replaced by it.

What We're Looking For

You bring 3+ years of Python backend experience and genuine interest in AI agent systems. This isn't a role for someone who just wants to consume an LLM API and call it done. You reason well about async and distributed workflows, take ownership of your work, write clean and well-tested code, and communicate clearly, especially when explaining agent behavior that isn't always deterministic. We work mainly in Finnish.

Required skills

• 3+ years professional Python backend development, including async programming.
• OOP and clean service architecture.
• REST API design (FastAPI).
• ORMs & migrations (SQLAlchemy, Alembic).
• Practical AI agent building — agent logic, tool use, state (LangChain, LangGraph).
• Testing discipline: unit/integration/API tests, mocking LLM calls.
• Docker (containerization — no orchestration ownership needed).
• Effective use of AI coding tools without losing engineering judgement.
• Basic CI familiarity.
• Excellent English, spoken and written. Finnish is preferred.

Preferred

• FastMCP / MCP server-building experience.
• Power BI, Microsoft Fabric, or BI/analytics platform experience.
• Machine learning knowledge; vector search, embeddings, RAG.
• dbt or Databricks familiarity.
• Task queues (Celery, arq) and Redis for agent workflows.
• Experience building features on top of semantic layers/warehouses, or integration platforms consolidating multiple source systems.

Why Greenstep?

Greenstep is a family-owned company founded in 2010 with no loans and a strong balance sheet. Since 2010, we have grown to almost 800 people, more than 3000 customers, and we are looking forward to continuing this growth journey! We provide the full spectrum of financial services, from accounting to interim CFOs for some of the fastest growing companies in Finland as well as all over the Nordics. Everyone works closely together, meaning you will be working with other CFO’s, Accountants, Payroll Specialists, HR specialists, Systems and Integrations Specialists, but most importantly, with great customers. Besides our consulting services, we already have a large, established tech team with over a hundred people who use programming languages for working with data. With us, you will be part of a work community where expertise, responsibility, and caring for others are visible.

Support for your well-being. For us, everyone's well-being and well-being at work are top priorities. Our occupational health is comprehensive, and our offices are ergonomically designed. The Flex benefit and lunch discount offered through Epassi are available to you. However, the number one thing that supports your well-being at work is a sustainably built resource budget.

A salary model that matches your responsibilities and experience. All Greenstep employees are also included in our Together bonus, through which we share 10% of the annual operating profit among all employees, regardless of role.

Support and time for development and strengthening your skills. At Greenstep, continuous learning is at the core of what we do. Our own Greenstep Academy offers training in various topics almost weekly!

Career opportunities in a growing family-owned company. We grow organically primarily with a few small exceptions where the culture has been 100% on par with ours. Because, we want to grow in a controlled manner, profitably and without compromising on quality. For us, growth means new opportunities: we can make a more positive impact on society, create new jobs, invest in the development and skills of our personnel, and enable business continuity. Our culture has developed together over the years, and our values are reflected in our everyday work.

This role is located in our Espoo or Vantaa office. With our hybrid work model, we are at least 50% of the work time at the office with our colleagues! Please note that Greenstep doesn't sponsor work visas, so to work with us, you need to hold a full-time work permit and live close to mentioned locations.

30.8.2026.

References will be checked for the selected candidate.