Backend Engineer, Billing/Tax

Fonoa is the Tax Operating System for autonomous tax. AI that tracks every rule, acts on every obligation, and proves every decision, built on modular infrastructure. Fonoa’s modules cover the full indirect tax lifecycle: tax ID validation, real-time tax determination, e-invoicing, and returns. All on one shared data model and integration, with one audit trail. Each added capability makes the others stronger. Agents monitor obligations, populate returns, catch anomalies and assemble audit packs in seconds. The system does the work. Humans make the calls. That’s autonomous tax. We operate across 120+ countries, with clients going live in weeks, if not days. Trusted by Canva, Netflix, Spotify, Uber, Zoom and Booking.com. Rated 4.5/5 stars and a High Performer on G2 and 4.6/5 stars on Gartner Peer Insights. Find out more: www.fonoa.com ABOUT ENGINEERING AT FONOA Engineering is central to how we build the business. We focus on solving real customer problems, not just shipping features. We work in small, high-trust teams, with full ownership across the lifecycle, from design to production and beyond. We value: * Ownership – engineers own what they build end-to-end * Simplicity – we break down complex problems into clear solutions * Thinking Big - we innovate with modern technologies (LLMs, AI Agents, etc.) to solve meaningful problems * Quality – scalable, maintainable systems are non-negotiable * Speed & iteration – we ship fast, learn, and improve continuously * Collaboration – we win as a team, not as individuals POSITION OVERVIEW As Fonoa continues to scale globally, we are looking for a Software Engineer, ERP Integrations to help us build and expand integrations with complex enterprise systems used by some of the world’s largest companies. This role sits at the intersection of product engineering, enterprise systems, and large-scale financial workflows. You will work on designing and building integrations that connect Fonoa with ERPs, billing platforms, procurement systems, and other critical parts of the enterprise ecosystem. This is not a role focused on maintaining isolated connectors. You will work on solving complex integration challenges at scale dealing with large external APIs, inconsistent data models, reliability concerns, and evolving customer requirements. You will help shape how our platform integrates into core enterprise workflows such as Order-to-Cash and Procure-to-Pay. You’ll work closely with engineering, product, and customers to understand how businesses operate in practice and translate those workflows into scalable, reliable product capabilities. We are looking for someone who enjoys operating in complex environments, has strong ownership, and is excited by the challenge of building systems that sit at the core of critical financial operations. This is a highly collaborative, hands-on role for someone who enjoys solving difficult integration problems, building robust systems, and continuously improving how enterprise systems connect and exchange data. What You Will Do * You are fully proficient in English. Written and spoken, we are from around the world, but we work in English. * You have a strong sense of ownership, care about what you build, and do the right thing that serves your customers. * You’re a builder at heart; you like the opportunity of having tons of exposure, making things work for a company long term, and having an entrepreneurial attitude toward anything that comes your way. * You have experience building or operating integrations with enterprise systems, such as ERPs, billing platforms, or large financial systems. * You understand how enterprise business processes like Order-to-Cash and Procure-to-Pay work, and how systems integrate within those flows. * You have hands-on experience with a single ERP or enterprise system and are motivated to apply those patterns while learning others. * You are comfortable working with complex external APIs and data models, and designing for reliability, scalability, and correctness. * You ship fast, continuously, and iteratively, learning each step. * You like to use data over opinions to make decisions. And are ok with finding the data yourself when it’s missing. * You are comfortable with change, either in priorities, goals and deadlines. You see this more as an opportunity than a hurdle. You are also satisfied with challenging the status quo and pushing for change. * You want to make a severe impact and are excited about working in a high-growth startup. WHAT WE’RE LOOKING FOR * Fully proficient in English, written and spoken — we are a global team and work in English * Strong sense of ownership and responsibility for what you build * Builder mindset with curiosity, proactivity, and an entrepreneurial approach to problem solving * Experience building or operating integrations with enterprise systems such as ERPs, billing platforms, or large financial systems * Understanding of enterprise business processes such as: * Order-to-Cash (O2C) * Procure-to-Pay (P2P) * Hands-on experience with at least one ERP or enterprise platform, and interest in learning others * Comfortable working with complex external APIs, large data models, and distributed systems * Ability to design systems with reliability, scalability, and correctness in mind * Comfortable shipping iteratively, learning quickly, and improving continuously * Data-informed mindset and willingness to investigate problems independently * Comfortable operating in fast-changing environments with evolving priorities * Excited about making a meaningful impact in a high-growth startup environment API DOCUMENTATION For engineers, API design and structure are an important part of evaluating a role. You can explore our API and how we build products here: https://docs.fonoa.com/ TECH STACK We use these technologies today, but we don’t hire for specific tools. We care about engineers who can understand problems, make good technical decisions, and choose the right tools for the job. * Backend: Node.js, Go * Frontend: React, TypeScript * Infrastructure: GCP,, k8s, Terraform, Postgres Note: If you don’t think you have the full experience we’re looking for, but you could be a fit and are willing to learn, do apply anyway! We are building diverse and inclusive team. As part of the recruitment process at Fonoa, we process your personal data in accordance with our Privacy Notice for Job Applicants. This notice explains how and why your data is collected and used, and how you can contact us if you have any concerns.

Fonoa is the Tax Operating System for autonomous tax. AI that tracks every rule, acts on every obligation, and proves every decision, built on modular infrastructure. Fonoa’s modules cover the full indirect tax lifecycle: tax ID validation, real-time tax determination, e-invoicing, and returns. All on one shared data model and integration, with one audit trail. Each added capability makes the others stronger. Agents monitor obligations, populate returns, catch anomalies and assemble audit packs in seconds. The system does the work. Humans make the calls. That’s autonomous tax. We operate across 120+ countries, with clients going live in weeks, if not days. Trusted by Canva, Netflix, Spotify, Uber, Zoom and Booking.com. Rated 4.5/5 stars and a High Performer on G2 and 4.6/5 stars on Gartner Peer Insights. Find out more: www.fonoa.com ABOUT ENGINEERING AT FONOA Engineering is central to how we build the business. We focus on solving real customer problems, not just shipping features. We work in small, high-trust teams, with full ownership across the lifecycle, from design to production and beyond. We value: * Ownership – engineers own what they build end-to-end * Simplicity – we break down complex problems into clear solutions * Thinking Big - we innovate with modern technologies (LLMs, AI Agents, etc.) to solve meaningful problems * Quality – scalable, maintainable systems are non-negotiable * Speed & iteration – we ship fast, learn, and improve continuously * Collaboration – we win as a team, not as individuals POSITION OVERVIEW As Fonoa continues to scale globally, we are looking for a Data Engineer to help us bootstrap an internal data platform from the ground up. Working closely with the Infrastructure team, you will play a foundational role in unlocking the value hidden across our different systems and make data accessible to both technical and non-technical stakeholders in a seamless way. This is not a role where you'll walk into a mature data stack with well-defined requirements. We have data spread across multiple systems and services, and we need someone who can help us experiment, iterate, and discover how to best add value to the business and our products through data. You'll be exploring what's possible, building the first versions of pipelines and tooling, and shaping the direction of data engineering at Fonoa. This is a highly collaborative, hands-on role for someone who thrives in ambiguity, brings curiosity and proactivity, and is energised by the challenge of building something from scratch rather than maintaining something that already exists. What Will You Do Data Platform Foundations * Design, build, and iterate on the foundational data infrastructure that will become Fonoa's internal data platform * Evaluate and select appropriate tools and technologies based on our needs, scale, and team capabilities * Establish patterns and best practices for data modelling, cataloguing, and documentation, and data governance and quality standards early on Data Integration & Access * Connect and consolidate data from multiple internal systems and services into a unified, queryable layer * Build interfaces and tooling that enable non-technical users (including Product, Finance, Operations) to consume data independently * Ensure data quality, consistency, and reliability across sources through validation and monitoring Exploration & Value Discovery * Partner with stakeholders across the business to understand their data needs and identify high-impact opportunities * Prototype dashboards, reports, and data products to test hypotheses about where data can drive decisions * Help define what "data-driven" looks like at Fonoa and shape the roadmap accordingly Collaboration & Enablement * Work closely with the Infrastructure team on cloud resources, networking, and security considerations for data workloads * Partner with Finance, Operations, and Product to understand their reporting and analytical needs, and translate those into reliable, queryable data products * Share knowledge and advocate for data engineering best practices across the organisation What We Are Looking For * 5+ years of experience in a Data Engineering or similar role (Analytics Engineering, Backend Engineering with heavy data work) * Solid proficiency in SQL and at least one programming language (Python, Scala, or similar) * Experience building and maintaining ETL/ELT pipelines and working with data warehousing or lakehouse architectures * Hands-on experience with modern data stack tooling — particularly a columnar warehouse (BigQuery, Snowflake, or similar), a transformation layer (dbt or equivalent), and an ingestion/CDC tool (Airbyte, Fivetran, or similar) * Familiarity with cloud platforms (GCP preferred) and their data services * Experience with workflow orchestration tools * Strong communication skills and the ability to work with non-technical stakeholders and translate their needs into data solutions * Comfort with ambiguity and an ability to make pragmatic decisions with incomplete information * Prior experience bootstrapping a data platform or data function from scratch Bonus Points If You Have * Experience with data visualisation and BI tools (Metabase, Looker, Superset, or similar) * Background working in a product-oriented SaaS company * Experience working with financial or operational data (revenue, billing, reconciliation) * Exposure to infrastructure-as-code and DevOps practices What Success Looks Like * A first iteration of an internal data platform is running, consolidating data from key systems into a reliable, queryable layer * Non-technical stakeholders can access and explore data relevant to their work without needing engineering support for every question * Clear patterns and documentation exist for how data is ingested, transformed, and consumed * You have identified and delivered at least one high-impact data use case that demonstrably adds value to the business or product API DOCUMENTATION For engineers, API design and structure are an important part of evaluating a role. You can explore our API and how we build products here: https://docs.fonoa.com/ TECH STACK We use these technologies today, but we don’t hire for specific tools. We care about engineers who can understand problems, make good technical decisions, and choose the right tools for the job. * Backend: Node.js, Go * Frontend: React, TypeScript * Infrastructure: GCP, k8s, Terraform, Postgres Note: If you don’t think you have the full experience we’re looking for, but you could be a fit and are willing to learn, do apply anyway! We are building a diverse and inclusive team. As part of the recruitment process at Fonoa, we process your personal data in accordance with our Privacy Notice for Job Applicants. This notice explains how and why your data is collected and used, and how you can contact us if you have any concerns.