Senior Software Engineer | API

DeepL

MEET DEEPL DeepL is a global AI product and research company focused on building secure, intelligent solutions to complex business problems. Over 200,000 business customers and millions of individuals across 228 global markets today trust DeepL's Language AI platform for human-like translation, improved writing and real-time voice translation. Founded in 2017 by CEO Jaroslaw “Jarek” Kutylowski, DeepL now has around 1,000 passionate employees and is supported by world-renowned investors including Benchmark, IVP, and Index Ventures. Our goal is to become the global leader in trusted, intelligent AI technology, building products that drive better communication, foster connections, and create a meaningful impact. To achieve this, we need talented people like you to join our journey. If you’re ready to shape the future of AI and grow your career in a fast-moving, purpose-driven environment, DeepL is your next destination. WHAT SETS US APART What sets us apart is our blend of cutting-edge AI technology, meaningful work, and a culture where people truly thrive. We’re a team of innovators, researchers, and creators driven by a shared purpose to unlock human potential by making work simpler, smarter, and more connected. When we share what it’s like to work at DeepL, the reactions are overwhelmingly positive. This might be because of our technology that helps millions of people and businesses communicate and work better every day, or because of the trust, curiosity, and care that shape our culture. What we know for sure is this: being part of DeepL means joining a team dedicated to innovation, growth, and well-being. Discover more about life at DeepL onLinkedIn,Instagram, and our Blog. MEET THE TEAM BEHIND THIS JOURNEY The API & Partnership track acts as the gateway to DeepL, enabling the world to integrate our Language and AI capabilities into their own digital ecosystems. We do not just build APIs; we architect the "Golden Path" that allows internal teams to ship faster while ensuring our external interfaces are enterprise-ready. We are the stewards of scale, trust, and integration, empowering millions of users to access DeepL reliably and securely. YOUR RESPONSIBILITIES You will serve as a technical strategist, enabling 10x API delivery speed and establishing the trust required for enterprise adoption. Your work will bridge the gap between complex distributed systems and seamless partner integrations. You will: * Drive API Strategy & Scale: Architect a hyper-scalable infrastructure designed to support exponential growth in traffic and data volume. You will set the technical vision for our microservices, ensuring our systems remain resilient, secure, and performant as we scale to the next tier of usage. * Enable the Partner Ecosystem: Lead the technical side of strategic partnerships, building integrations with AWS Marketplace and enterprise SaaS providers. You will own the delivery of "Trust" features—such as granular billing, residency controls, and auditability—that are essential for closing enterprise deals. * Force-Multiply Engineering Velocity: Establish rigorous platform standards (contracts, versioning, security) that raise the bar for the entire organization. By building self-service tooling and automated quality gates, you will empower product teams to deploy independently without breaking production. QUALITIES WE LOOK FOR * Distinguished Technical Experience: 10+ years in software engineering with a focus on high-scale distributed systems and API platform architecture. You have "been there, done that" with modern cloud stacks and backend technologies, and you drive engineering cultures centered on automated testing and operational discipline. * Enterprise Integration Mastery: You understand the nuance of the enterprise landscape. You have deep experience navigating compliance, security, and data residency challenges while building integration patterns that allow third-party ecosystems to thrive on top of your platform. * Strategic Communication: You can translate complex technical challenges into clear strategic proposals. You are adept at writing RFCs and influencing stakeholders across the business—from product managers to other Staff engineers—driving consensus and execution in ambiguous environments. * AI-Native Developer: You embrace the potential of AI to transform software development. You actively use and advocate for AI tools to streamline workflows and are eager to guide the organization in adopting AI-assisted engineering practices. WHAT WE OFFER * Diverse and internationally distributed team: joining our team means becoming part of a large, global community with people of more than 90 nationalities. We're more than just colleagues; we're a group of professionals with a shared mission to connect diverse cultures. Our global presence is growing–we've doubled in size nearly every year, with our employees based in the UK, Germany, the Netherlands, Poland, the US, and Japan, and we continue to expand our network. * Open communication, regular feedback: as a language-focused company, we value the importance of clear, honest communication. We value smooth collaboration, direct and actionable feedback, and believe that leading with empathy and growth mindset makes us better together. * Hybrid work, flexible hours: we offer a hybrid work schedule, with team members coming into the office twice a week. This allows you to engage directly with your team and experience the unique energy of our workspace, while still enjoying the flexibility and comfort of working from home. With flexible working hours and trust in your productivity, we are in sync with your team's general locations and time zones to foster effective and seamless collaboration. * Virtual Shares - An ownership mindset in every role. We believe everyone should share in our success, and that's why every employee receives Virtual Shares, linking your contribution directly to DeepL's growth and rewarding you with a stake in our future. * Regular in-person team events: we bond over vibrant events that are as unique as our team, from local team and business unit gatherings, to new-joiner onboardings, to company-wide events that bring us all together–literally. * Monthly full-day hacking sessions: every month, we have Hack Fridays, where you can spend your time diving into a project you're passionate about and get the opportunity to work with other teams–we value your initiatives, impact, and creativity. * 30 days of annual leave: we value your peace of mind. With 30 days off (excluding public holidays) and access to mental health resources, we make sure you're as strong mentally as you are professionally. * Competitive benefits: just as our team spans the globe, so does our benefits package. We've crafted it to reflect the diversity of our team and tailored it to align with your unique location, to ensure you feel supported every step of the way. If this role and our mission resonate with you, but you're hesitant because you don't check all the boxes, don't let that hold you back. At DeepL, it's all about the value you bring and the growth we can foster together. Go ahead, apply—let's discover your potential together. We can't wait to meet you! #LI-JL1 WE ARE AN EQUAL OPPORTUNITY EMPLOYER You are welcome at DeepL for who you are - we appreciate authenticity here. Our product is for everyone, and so is our workplace. The more voices we have represented and amplified in our business, the more we will all succeed, contribute, and think forward! So bring us your personal experience, your perspectives, and your background. It’s in our diversity that we will find the power to break down language barriers in the world.

Warp

ABOUT WARP Warp is the AI-native Employee Management Platform for ambitious companies. Our platform includes HRIS, payroll, IT, benefits, tax compliance, and more - all built from scratch on an AI-native architecture from day 1. Warp embeds itself into every part of a company's people operating layer, we process over half a billion $ annually in payroll, on track to grow to $2B. Legacy vendors in our space built their businesses by profiting from complexity. Warp is built from day one for AI to be the primary operator, not a feature. Every advance in LLM capability widens our lead. We hire people who ship constantly, own outcomes, and care about craft. We're in the office five days a week because speed and proximity are a competitive advantage at this stage. If you want to build something that automates an entire category of core work, not just another point solution, this is the place. We've raised over $85M from top investors like Ashton Kutcher/Sound Ventures, Y Combinator, founders of Dropbox, Replit, SV Angel, and Homebrew Capital. Built by an obsessive team from MIT, Ramp, Brex, Google, Dropbox, Apple, and more. ABOUT WARP Warp is building self-driving employee management. Payroll, tax compliance across thousands of jurisdictions, benefits, IT, and HRIS that runs autonomously so companies never have to think about back-office operations again. We process hundreds of millions in payments across 1,000+ companies. Revenue has grown 5x+ YoY for two years. We're a team of ~40 in NYC in Flatiron, scaling fast, and expecting to be 100 people by end of year. The incumbents (ADP, Paylocity, Paychex) built their businesses by profiting from complexity. Even the modern players are bolting chatbots onto legacy systems. Warp is built from day one for AI to be the primary operator, not a feature. Every advance in LLM capability widens our lead. We hire people who ship constantly, own outcomes, and care about craft. We're in the office five days a week because speed and proximity are a competitive advantage at this stage. If you want to build something that automates an entire category of core work, not just another point solution, this is the place. Backed by $25M+ from Ashton Kutcher/Sound Ventures, Y Combinator, founders of Dropbox, Replit, SV Angel, and Homebrew Capital. Built by an obsessive team from MIT, Ramp, Brex, Google, Dropbox, Apple, and more. ABOUT THE ROLE As a Senior Software Engineer focused on Developer Platform at Warp, you'll build the external-facing API layer that lets companies programmatically control payroll, benefits, HR, IT, and more. That means designing robust APIs, building OAuth flows and authentication infrastructure, webhook delivery systems, event log infrastructure and the products that make them queryable, SDK generation, and world-class documentation. You'll own the full developer experience, from the reliability of the underlying platform to the clarity of the docs, and be the primary interface between Warp's core systems and the developers who build on top of them. WHAT YOU'LL DO * Design, build, and maintain Warp's external APIs * Build webhook infrastructure: reliable delivery, retries, failure visibility * Build event log systems and the products that make them queryable by customers and partners * Build OAuth and authentication infrastructure for third-party integrations * Own SDK generation and developer tooling * Write and maintain developer documentation * Handle technical communications with integration partners and enterprise customers * Define the API platform roadmap in collaboration with the CTO YOU'LL BE GOOD FOR THIS ROLE IF YOU * Have built developer-facing APIs and platforms that external developers rely on * Have experience building webhook systems, event streaming, or audit log infrastructure * Care deeply about API ergonomics, consistency, and documentation quality * Have owned a developer platform or external API at a high-growth startup * Understand the hard parts of external APIs: idempotency, versioning, backwards compatibility, and graceful failure * Are comfortable being the face of Warp's API: writing docs, talking to developers, owning the experience WHAT YOU NEED * 5+ years of software engineering experience * Experience building and maintaining public-facing APIs at scale * Experience with SDK generation or developer tooling * Strong written communication skills * Willingness to work from our NYC office five days a week BENEFITS AT WARP: * 100% Health Coverage: Comprehensive medical, dental, and vision plans for you and your dependents. * 401(k) Matching: Start investing in your future from day one. * Unlimited PTO: We offer flexible PTO, meaning you’re trusted to take the time you need to recharge while balancing your responsibilities and team commitments. * Commuter Benefits: Pre-tax commuter benefits for your daily trip to our NYC office. * Catered Lunch Daily: Great food, every day, on us. No meal prep, no decision fatigue. * Quarterly Offsites: Beautiful locations to connect as a team. Past locations include Spain and Catskills. Warp is based in New York City, and we prioritize candidates who can commit to being on-site 5x per week. Please refer to the top of this page for this position's hiring location.

Flow Traders

Flow Traders is looking for Senior C++ Software Engineers to join our growing team in Amsterdam. Software Engineers at Flow Traders provide us with our competitive edge, equipping Researchers and Traders with the information and capabilities that they need to make sound business decisions. C++ plays a critical role in our event-driven trading systems, which are designed to reliably handle vast amounts of data at ultra-low latencies. As a C++ Engineer, you will build systems used to analyze and trade tens of thousands of products across hundreds of global trading venues every day. Working closely with Technologists, Quantitative Researchers, and Traders, you’ll guide the development of our in-house trading technology and optimize it to achieve market-leading performance and reliability. Our proprietary trading platform includes everything from venue connectivity (feed handlers and ordering gateways) to trading engines to shared platforms that enable us to work quickly and efficiently - we are proud of our open and collaborative culture, so you’ll have plenty of opportunity to find what fits you best. Teamwork is one of our most important firm values, and end users are never more than a short walk away, guaranteeing short feedback loops and immediate insight into the value that your code provides. To foster collaboration and innovation, we maintain shared libraries, encourage code re-use, and continuously evolve our views on application architecture. WHAT YOU WILL DO For all C++ openings: * Lead the development and global rollout of our Core platform used in multiple business/focus groups (Market data, Quantitative research, Pricing, Strategies) * Be involved in the development process, which will be a fast-paced iterative process where you deploy your deliverables and validate them yourself and/or together with traders or quants * Develop tools/frameworks to deliver capabilities for tuning/develop data-driven systematic pricing and trading strategies * Work together with focus group engineers, Quants and Technical traders to refine requirements, collect feedback, and iterate on design and implementation of platform requirements Exchange Connectivity: * Write software that communicates with exchanges through their APIs, receiving market data and sending orders over the network in different protocols, such as FIX, Websocket or HTTP requests * Ensure quality of software based on a set of testing suites, which you are expected to use, maintain and extend * Optimize exchange communication through kernel bypass, optimizing TLS or the connection handling to an exchange * Research exchange behavior in detail to align our behavior to that of an exchange * Implement these solutions using the provided exchange SDKs in different languages such as C++, Rust, Python, Typescript Trading Strategies: * Implement trading algorithms based on requirements provided by traders and quants * Acquire and develop the necessary trading knowledge to successfully translate the requirements into actual software implementation * Continuously improve the stability, reliability, and performance of the trading engine * Enhance monitoring and observability in collaboration with the Trading Operations team * Investigate and resolve production issues such as crashes, unexpected business logic behavior, and performance bottlenecks * Prepare for releases and deployments of new trading engine versions WHAT YOU NEED TO SUCCEED * BSc, MSc, or PhD in Computer Science, Mathematics or equivalent * 5+ years post-graduation professional C++ software development experience (proprietary trading industry preferred) * Ability to write clean, reliable, and highly scalable code * Good knowledge of algorithms and data structures * Experience in parallel, asynchronous, and multithreaded programming *  Interest in achieving maximum performance from available hardware and software *  Ability to communicate with technical and non-technical business colleagues At Flow Traders, we acknowledge the importance of open and transparent communication whether it be with our employees, our stakeholders, or our local and global communities. When it comes to salary, Flow Traders uses reliable market research to create base ranges. Where candidates will fall within the range depends on a few different factors including but not limited to level of experience, location, and specific skill set. We also consider ourselves one global team, and to demonstrate that, all employees are eligible to share in the company’s success through an annual discretionary variable remuneration allocated based on company, group and individual performance and contribution.  Per NYC salary transparency law, the total compensation for this role includes a base range of $185,000 to $225,000 plus annual discretionary variable remuneration.   Flow Traders does not accept unsolicited resumes from any professional staffing or search firms. All resumes, and any other information identifying potential candidates, submitted to any employee at Flow Traders via-email, the Internet or directly without a valid and signed search agreement will be deemed free to contact by Flow Traders without any restrictions and no placement fee of any kind will be paid in the event the candidate is hired by Flow Traders. #LI-MM1