Senior Backend Developer (Python)

A Different Kind Of Job Description We believe in radical transparency at Filed, so this job description is a little different. It starts with why this is a terrible job. Then it tells you why it might be the best career choice you'll ever make. Why this is a terrible job This is an incredibly high-paced, high-tempo environment. We're making a generational bet to change all of our lives, and generational bets are not comfortable. You will build agents for subjective workflows. Tax law is objective, but what applies under it and how professionals interpret it is full of judgment. You can give two tax professionals the same task and get two different results where both are right. We're building agentic systems that have to reach their level of accuracy, not a level we decided is good enough. From an engineering standpoint, this is the hardest thing most of us have ever built. At times it will feel like hitting your head against the wall. Customers will sometimes get frustrated, because they expect deterministic results from probabilistic systems, and we're managing the expectations of some of the biggest firms in the world, including the Big Four. And the rhythm is real: we get to the office, we work, we go home and spend time with our families, and then many of us get back online to support our customers in US hours. It's tough. It's relentless. Why it might be the best career choice you'll ever make It's addictive to be part of a business when you know you're winning. Filed is adding millions of dollars of revenue every quarter, customers are signing up in numbers, and in under two years we've become the market leader in a space with entrenched incumbents and a drastic need for new AI tools. When we come into head-to-heads with competitors, we win every time, because our product is superior. And we stay focused and diligent: we only work with tax firms that have the right expectations, which is why our typical customer is mid-market and enterprise. The industry looks boring from the outside, but the problem is unsolved, and the space has been riddled with products below the mark for decades. When you push through the wall, there's a spark of joy: a customer says "wow, this is phenomenal." That keeps happening. The opportunity here is not only to make a great deal of money. It's to have real impact on our mission: making this profession extraordinary. Nobody became a tax professional for the admin. They got into this work to be creative with tax law, to have fun, and to change the fabric of society. Filed enables them to do exactly that. We've raised $17.2 million to date, led by Northzone, and you can read the story in TechCrunch. Our focus now is to deliver the roadmap and continue to win. What You'll Build As a Senior Backend Developer (Python), you'll build and shape the engine room of Filed: The Python services that power tax computation, document processing, and agentic workflows at scaleDeep integrations with the tax software firms already use, so Filed works where they workThe data pipelines that move documents, returns, and evidence reliably through the most intense weeks of tax season You'll own the architecture end to end, set the technical bar for the services the whole product stands on, and see your decisions carry real weight for some of the most demanding professional users in the world within days, not quarters. What You'll Be Responsible For Designing, building, and operating backend services across our AI tax prep, planning, and review productsOwning the architecture, APIs, and data models that the rest of the product is built onShipping fast, watching metrics, and deciding what to improve next, without being toldMaking LLM-powered pipelines reliable, observable, and accurate in productionRaising the bar for the engineers around you through reviews, pairing, and example Your Hard Skillset Deep Python experience: you've designed, built, and operated production services and APIs at scaleDeep understanding of building in agent first way, using coding agents daily and controlling LLM driven workflows.Strong grasp of distributed systems, data modeling, queues, and the failure modes that come with themStrong React/Typescript: you know how to control systems not just backend relatedComfortable owning cloud infrastructure on Google Cloud and/or AzureBonus if you've worked in fast-paced startups or regulated industriesEven bigger bonus if you've taken a product from 0 to 1 and watched real users depend on it Your Soft Skillset Comfortable being uncomfortable and making calls with incomplete dataEmpathetic and curious: building for the user, not just for clean codeHighly collaborative across product, engineering, and taxDetail-oriented but pragmatic: you know when polish matters and when to shipYou own your work and welcome the accountability that comes with it A championship team We think of ourselves as a sports team. Incredibly high performance, incredibly high standards, and real success to show for it. Being a championship team means working with people who are deeply proud of the work they do and have great fun doing it together. We measure employee happiness constantly, and our eNPS is +60. We don't say that to brag. We say it because a team playing at this tempo only holds together if people genuinely love being on it. Every four months, the whole company comes together for an offsite. What Filed Stands For Not posters. Not corporate language. Real operating standards. No problem is someone else's problem If you see it, it's yours. Bugs, customer confusion, missed expectations, internal friction. We don't pass problems sideways and we don't hide behind roles. You fix the typo even if you didn't write it, jump into a customer issue even if it's not your department, escalate early, and close loops fully. Ownership means you drive resolution, not that you suffer silently or burn out doing everything alone. Waiting is not a strategy Momentum is our advantage. We don't wait for perfect information or stall because something is unclear. You ship a V1 instead of debating V5, test instead of theorize, run small experiments instead of requesting big approvals, and propose solutions instead of just naming blockers. Speed is powerful. Sloppiness is not, and recklessness has no place in a high-trust industry. We run toward the fire When something breaks, we move. Tax is high-stakes and trust is fragile. We acknowledge issues immediately, communicate clearly and often, prioritize customer-impacting problems fast, and stay on it until it's fully resolved. Firefighting is a strength, not panic, and never an excuse for preventable mistakes. We win on customer experience AI will commoditize. Features will copy. Pricing will compress. Experience won't. We respond faster than customers expect, communicate proactively, think like a partner rather than a ticketing system, and anticipate needs before they're raised. Overdelivering means raising the standard of care, not overpromising, hero culture, or burning the team out. Who This Suits This is a very fun environment, but it only suits people who meet the criteria we're looking for: People who want to winPeople who have a point to provePeople who want to write their own job descriptions How We Pay Nothing at Filed is behind closed doors. Everyone here sees everyone else's salary, because we believe transparency creates trust, and trust is the foundation of excellent teamwork. Compensation isn't a negotiation. Depending on your location, everyone receives the same three offers, and all of our offers are above market benchmarking. This role is assessed at Level 4 (Senior). The salary and equity bandings are: Most Equity: 82,500 SEK per month + $180,000 of equityGreat Equity: 90,000 SEK per month + $120,000 of equityGood Equity: 97,500 SEK per month + $60,000 of equity We run performance reviews every four months. Meet your goals and you can expect to double your equity by the end of your first year. One more thing, in the spirit of transparency: some people who apply for this role will be assessed at a different level. If the team determines your level of responsibility sits differently, we'll adjust the offer accordingly. If you're earlier in your journey than this role expects, that's not a problem. Apply to the Backend Developer (Python) role instead. Benefits A minimum of 30 days of holiday per year, whether you're in Europe or the USIn the US: fully covered medical expenses on platinum-level plans, with 100% coverage for your dependents as wellIn Europe: the full set of mandatory benefits, and more on topCompany-wide offsites every four months The process Quick intro call (30 minutes)Technical walkthrough and async task (60 minutes)Final round with our team (120 minutes) In just 3.5 hours, you'll be wanting early access, just like the rest of our team, to get into the stack and start building a generational company, even before your first day. About Filed Filed is the AI tax preparer trusted by America's accounting firms. Taxes might seem boring, but they are the $5 trillion backbone of the US economy. Globally, nearly $15 trillion in taxes is collected every year. Behind every dollar of it sits a professional making judgment calls, and the industry that does this work is breaking under a talent shortage no one has solved. We're fixing it. Today, hundreds of firms run Filed inside the systems they already use, and we're backed by Northzone, Neo, Analog, and Raine. There has never been a more exciting time to work on a problem this complex. Join us while "I was there when it all started" is still true.