Senior Software Engineer

Upwork

Upwork Inc.’s (Nasdaq: UPWK) family of companies connects businesses with global, AI-enabled talent across every contingent work type including freelance, fractional, and payrolled. This portfolio includes the Upwork Marketplace, which connects businesses with on-demand access to highly skilled talent across the globe, and Lifted, which provides a purpose-built solution for enterprise organizations to source, contract, manage, and pay talent across the full spectrum of contingent work. From Fortune 100 enterprises to entrepreneurs, businesses rely on Upwork Inc. to find and hire expert talent, leverage AI-powered work solutions, and drive business transformation. With access to professionals spanning more than 10,000 skills across AI & machine learning, software development, sales & marketing, customer support, finance & accounting, and more, the Upwork family of companies enables businesses of all sizes to scale, innovate, and transform their workforces for the age of AI and beyond. Since its founding, Upwork Inc. has facilitated more than $30 billion in total transactions and services as it fulfills its purpose to create opportunity in every era of work. Learn more about the Upwork Marketplace at Upwork.com and follow us on LinkedIn, Facebook, Instagram, TikTok, and X; and learn more about Lifted at Go-Lifted and follow on LinkedIn. ---------------------------------------------------------------------------------------------------------------------------------- As a Senior Software Engineer on the tax engineering team, you will build and improve the services that power tax calculation across VAT, sales tax, and withholding for a global platform. You'll own meaningful pieces of the backend, contribute to frontend workflows, and collaborate closely with engineers, product, finance, and compliance partners to ship reliable, well-tested systems. This is a strong fit for someone who enjoys working through detailed business logic, integrating third-party providers, and steadily raising the quality of complex financial software. RESPONSIBILITIES: * Build, extend, and maintain backend services for tax calculation and payments, focusing on accuracy, reliability, and clean, testable code. * Contribute to frontend workflows using Vue.js or similar modern JavaScript frameworks to support internal tools and customer-facing experiences. * Develop and maintain APIs and integrations with external payment processors and tax engines, improving performance, observability, and error handling. * Partner with product, finance, tax, and compliance stakeholders to translate business and regulatory requirements into well-scoped technical work. * Improve code quality through thoughtful testing, code reviews, and AI-assisted development workflows that increase velocity without sacrificing rigor. * Investigate production issues, identify root causes, and deliver durable fixes that strengthen the reliability of tax and payments systems. WHAT IT TAKES TO CATCH OUR EYE: * Solid backend engineering experience with Java, including building RESTful APIs, working with relational databases, and deploying services on AWS. * Working experience contributing to frontend applications using Vue.js or another modern JavaScript framework. * Track record of owning project-level work end to end and collaborating effectively with cross-functional partners. * Exposure to tax, fintech, payments, or another compliance-heavy domain is a plus, paired with a willingness to learn complex business rules quickly. * Practical fluency with AI-enabled engineering tools such as GitHub Copilot or Cursor, with the judgment to review and validate outputs and a habit of sharing useful AI techniques with teammates. ---------------------------------------------------------------------------------------------------------------------------------- Come change how the world works. Upwork is establishing its first international operational hub in Lisbon, Portugal. The new office is expected to be fully operational by Q4 2026. This role will require 3 days in office once we have an office open. This position will initially be employed through a partner to ensure a seamless hiring process while we establish the hub. Once the hub is established, there may be opportunities to transition to employment with Upwork, depending on business needs and other requirements. While employed by the partner, you’ll work as part of Upwork’s team, with access to our resources, culture, and growth opportunities. Our partner will offer competitive benefits. When Upwork’s hub is established, we will be excited to offer employment and benefits directly as business needs require.  Upwork is committed to building a diverse, inclusive, and equitable workforce. Employment decisions are made without regard to race, color, religion, gender, sexual orientation, gender identity, national origin, disability, or any other status protected by applicable law. We use BrightHire, an AI-enabled tool, to record interviews and summarize interview transcripts. The tool allows the interviewer to focus on the discussion and does not score or evaluate candidates or make recommendations. The interview transcripts are reviewed, and decisions are only made by humans. Candidates who prefer not to have their interview recorded through BrightHire can opt out when the interview is scheduled. To learn more about how Upwork processes and protects your personal information as part of the application process, please review our Global Job Applicant Privacy Notice and the Applicant Privacy Addendum (EEA, UK, and Switzerland). The annual base salary range for this position  is displayed below. The range displayed reflects the minimum and maximum salary for this position, and individual base pay will depend on your skills, qualifications, experience, and location. Additionally, this position is eligible for the annual bonus plan or sales incentive plan and eligibility to participate in our long term equity incentive program. Annual Base Compensation €53.500—€77.000 EUR   To learn more about how Upwork processes and protects your personal information as part of the application process, please review our Global Job Applicant Privacy Notice

GoCardless

About us GoCardless is a global bank payment company. Over 100,000 businesses, from start-ups to household names, use GoCardless to collect and send payments through direct debit, real-time payments and open banking.  GoCardless processes US$130bn+ of payments annually, across 30+ countries; helping customers collect and send both recurring and one-off payments, without the chasing, stress or expensive fees. We use AI-powered solutions to improve payment success and reduce fraud. And, with open banking connectivity to over 2,500 banks, we help our customers make faster, more informed decisions. We are headquartered in the UK with offices in London and Leeds, and additional locations in Australia, France, Ireland, Latvia, Portugal and the United States. At GoCardless, we're all about supporting you! We’re committed to making our hiring process inclusive and accessible. If you need extra support or adjustments, reach out to your Talent Partner — we’re here to help!  And remember: we don’t expect you to meet every single requirement. If you’re excited by this role, we encourage you to apply! THE ROLE Data sits at the core of our mission. We leverage bank account data to deliver high-value, intelligent payment solutions for our customers, from enhancing payment success rates to driving payer fraud prevention. As a Senior Data Scientist within our Payment Intelligence team, you’ll partner with Software Engineers, Product Managers, and Designers to turn big ideas into reality. You’ll own the full lifecycle of our algorithms, shaping everything from the initial concept to production-ready code that powers our global payment network. At GoCardless, our stack is centered around Google Cloud Platform and Vertex AI, providing a high-performance environment for innovation. Our Data Scientists operate at the intersection of Python, SQL, and BigQuery to build and deploy high-performance models at scale. WHAT YOU’LL DO * Lead the end-to-end delivery of models at scale, from initial discovery and feature engineering to production, A/B testing and continuous monitoring. * Collaborate with product and engineering peers to turn complex data into real-time, mission-critical fraud prevention solutions. * Raise the team’s collective bar through hands-on technical leadership and knowledge sharing. * Proactively research and integrate latest developments in ML and payer fraud prevention to drive innovation at GoCardless. WHAT EXCITES YOU * Being a self-starter who thrives on taking a vague business problem and owning the journey from the first prototype to a live, measurable solution. * An opportunity to introduce and scale advanced architectures to solve high-stakes fraud and payment challenges. * Moving beyond execution to help define the technical roadmap for Payer Fraud Prevention, ensuring we leverage the best tools for the job. * Building production-grade ML models on a streamlined GCP and Vertex AI stack to drive fintech innovation. WHAT EXCITES US * You hold a degree (or PhD) in a STEM discipline or an equivalent commercial experience. * You bring hands-on experience with sophisticated architectures, such as deep learning, graph-based, or sequence-based models (experience in Fintech, Fraud Prevention, or Payments is a big plus). * You can translate complex ML concepts into practical product solutions and communicate these ideas clearly to non-technical peers. * You are comfortable owning the full lifecycle, from deep-dive analysis and feature engineering to prototyping, validation, and live A/B testing. * You lead by example, writing clean, high-quality code and raising the team’s technical bar through knowledge sharing and code best practices.   Base salary range: €55,200 - €82,800 Please note this range is indicative. The budget for this role is flexible and will be shaped by the hiring process - we're open to discussing what's right based on the individual. Base salary ranges are based on role, job level, location, and market data.  Please note that whilst we strive to offer competitive compensation, our approach is to pay between the minimum and the mid-point of the pay range until performance can be assessed in role. Offers will take into account level of experience, interview assessment, budgets and parity between you and fellow employees at GoCardless doing similar work. (SOME OF) THE GOOD STUFF * Wellbeing - stay healthy with dedicated support and medical cover * Work away scheme - gives you the option to work away from your country of residence for up to 90 days in any 12 month period * Adaptive Working - allows you to work flexibly, around your lifestyle * Equity - all permanently employed GCs get equity to help you make a valuable contribution * Parental leave - to suit everyone embarking on life's great adventure * Learning Budget - lead your own development with an annual learning budget * Time off - generous holiday allowance, + 3 annual volunteer days, + 4 annual business-wide wellness days (‘GC Fridays’) LIFE AT GOCARDLESS   We're an organisation defined by our values; We start with why before we begin any project, to ensure it’s aligned with our mission. We act with integrity, always. We care deeply about what we do and we know it's essential that we be humble whilst we do it. Working this way creates the GC magic- the reason we all love showing up to work.  DIVERSITY & INCLUSION As of April 2025, we had 806 employees (GeeCees) globally, with 524 based in the UK, 163 based in Latvia and 119 across our other offices. To ensure that we're representative of the world around us - and to be able to review relevant benchmarks - we ask GeeCees to voluntarily disclose diversity data. This year, the proportion of GeeCees providing data increased to 88% (up from 79% in 2024). With regards to diversity within GoCardless, we can see GeeCees identifying as: Asian, Black, Mixed or Other — 25%  Neurodiverse — 9%  LGBTQIA+ — 9%  Disabled — 1%  Average age — 33 Female — 45% Male —  55%  We’re rooting for you during your application and GoCardless aims to provide reasonable adjustments to make our recruitment process as remarkable and accessible as we can. Please speak to your Talent Partner if you need extra support. If you want to learn more, you can read about our Employee Resource Groups and objectives here Sustainability We’re committed to reducing our impact on the environment, leaving a more sustainable world for future generations. Check out our sustainability action plan here. Find out more about Life at GoCardless via Twitter, Instagram and LinkedIn.

GoCardless

About us GoCardless is a global bank payment company. Over 100,000 businesses, from start-ups to household names, use GoCardless to collect and send payments through direct debit, real-time payments and open banking.  GoCardless processes US$130bn+ of payments annually, across 30+ countries; helping customers collect and send both recurring and one-off payments, without the chasing, stress or expensive fees. We use AI-powered solutions to improve payment success and reduce fraud. And, with open banking connectivity to over 2,500 banks, we help our customers make faster, more informed decisions. We are headquartered in the UK with offices in London and Leeds, and additional locations in Australia, France, Ireland, Latvia, Portugal and the United States. At GoCardless, we're all about supporting you! We’re committed to making our hiring process inclusive and accessible. If you need extra support or adjustments, reach out to your Talent Partner — we’re here to help!  And remember: we don’t expect you to meet every single requirement. If you’re excited by this role, we encourage you to apply! GoCardless are here to support you and we’re committed to making the hiring process inclusive and accessible for everyone. If you need any extra support or any adjustments made, please reach out to your Talent Partner. Remember, we don’t expect you to meet every requirement. If you’re excited by this role, we encourage you to apply PLATFORM ENGINEERING AT GOCARDLESS The Platform Engineering team is a unified, globally distributed team. We are currently located in London, Riga, and Lisbon. We work with all other engineering teams to empower them to build, release, run and scale their products. We operate with a strong focus on both strategic project delivery and operational excellence. Our work is a balance of: * Project Delivery: Building new platform components, from initial design to deployment. * Operational Support: Ensuring the health and stability of our systems through on-call rotations and incident management. * Business as Usual (BAU): Continuous maintenance, improvements, and support for audits and compliance.   Tech stack and tools: * Python, Ruby, Golang; * Terraform; * Atlantis  * AWS, GCP; * Kubernetes, GKE; * Github, GitHub Actions, ArgoCD; * Grafana, Prometheus; * Datadog WHAT EXCITES YOU: We use a wide range of technologies, and will never expect you to have experience with all of them. We do hope that you are enthusiastic about the infrastructure space and the impact your work can have on others. To enjoy this work you’ll be excited by: * Building and maintaining automation of new and existing infrastructure; * Appreciate and believe in building easy-to-understand and maintain tools to solve problems; * Automating operational tasks to eliminate toil using your software development skills and experience; * Ensuring that systems are safe and secure against cybersecurity threats; * Working closely with software engineers and data scientists; * Being involved in the technical design of architecture and making technical decisions; * Cloud-first engineering; * Ongoing opportunities to further develop your skills; * Care about working with people who share the same values as you and who will continually push you to grow. WHAT EXCITES US  * Experience with at least one programming language such as Python, Ruby, Golang etc.; * Experience with IaC tooling, such as Terraform; * Previous experience with Terraform automation toolings such as Terragrunt or Atlantis will be considered an advantage; * Experience with cloud computing providers such as AWS or GCP; * Experience with containerized applications; * Previous experience with container orchestration such as Kubernetes and GKE will be considered an advantage; * Experience with CI/CD tooling such as Github, GitHub Actions, ArgoCD, etc.; * Experience working with monitoring tooling such as Grafana, Prometheus, etc.; * Experience with relational databases and other datastores, especially around high availability and performance optimisation; * Awareness of DevOps and Agile principles; * Fluency in English; * Excellent teamwork and communication skills. Base salary range:  Site Reliability Engineer II: €43,200 to €64,800 gross Site Reliability Engineer III: €58,400 to €87,600 gross Senior Site Reliability Engineer: €76,000 to €114,000 gross Base salary ranges are based on role, job level, location, and market data. Please note that whilst we strive to offer competitive compensation, our approach is to pay between the minimum and the mid-point of the pay range until performance can be assessed in role. Offers will take into account level of experience, interview assessment, budgets and parity between you and fellow employees at GoCardless doing similar work. (SOME OF) THE GOOD STUFF * Wellbeing - stay healthy with dedicated support and medical cover * Work away scheme - gives you the option to work away from your country of residence for up to 90 days in any 12 month period * Adaptive Working - allows you to work flexibly, around your lifestyle * Equity - all permanently employed GCs get equity to help you make a valuable contribution * Parental leave - to suit everyone embarking on life's great adventure * Learning Budget - lead your own development with an annual learning budget * Time off - generous holiday allowance, + 3 annual volunteer days, + 4 annual business-wide wellness days (‘GC Fridays’) LIFE AT GOCARDLESS   We're an organisation defined by our values; We start with why before we begin any project, to ensure it’s aligned with our mission. We act with integrity, always. We care deeply about what we do and we know it's essential that we be humble whilst we do it. Working this way creates the GC magic- the reason we all love showing up to work.  DIVERSITY & INCLUSION As of April 2025, we had 806 employees (GeeCees) globally, with 524 based in the UK, 163 based in Latvia and 119 across our other offices. To ensure that we're representative of the world around us - and to be able to review relevant benchmarks - we ask GeeCees to voluntarily disclose diversity data. This year, the proportion of GeeCees providing data increased to 88% (up from 79% in 2024). With regards to diversity within GoCardless, we can see GeeCees identifying as: Asian, Black, Mixed or Other — 25%  Neurodiverse — 9%  LGBTQIA+ — 9%  Disabled — 1%  Average age — 33 Female — 45% Male —  55%  We’re rooting for you during your application and GoCardless aims to provide reasonable adjustments to make our recruitment process as remarkable and accessible as we can. Please speak to your Talent Partner if you need extra support. If you want to learn more, you can read about our Employee Resource Groups and objectives here Sustainability We’re committed to reducing our impact on the environment, leaving a more sustainable world for future generations. Check out our sustainability action plan here. Find out more about Life at GoCardless via Twitter, Instagram and LinkedIn.