Flex is a growth-stage, NYC headquartered FinTech company that is creating the best rent payment experience. It’s hard to believe that it’s 2026 and paying rent on time is expensive, inflexible, and difficult. We’re here to change that! Flex enables our users to pay rent throughout the month on a schedule that better fits their finances and budget. Our mission is to empower as many renters as possible with flexibility over their most significant recurring expense. After deliberately keeping a stealth profile as we built up unprecedented investor support and an enthusiastic user base, we are looking for motivated individuals to help us keep our mission growing. Will you be a part of the team? Flex is looking for a Staff level Engineer to join our dynamic team and play a pivotal role in accelerating our growth trajectory. In this role, you will be instrumental in developing and scaling the platform and app experiences that empower our users and partners, unlocking our next phase of 10x growth. What You'll Do: - Focus on creating exceptional user and partner experiences that drive engagement and retention. - Partner closely with product managers, designers, and data scientists, data analysts to identify and solve critical user onboarding challenges. - Design, develop, test, and deploy robust APIs, services and data pipelines that enhance user onboarding and overall platform experience. - Implement changes through an agile methodology, prioritizing rapid iteration and continuous improvement. - Utilize data and analytics to measure the impact of your work and identify opportunities for optimization. Qualifications Minimum Qualifications - 7+ years of professional software development experience. - 3+ years of hands-on experience with Java. - 3+ years of experience with React or React Native. - 3+ years of experience with TypeScript. - Having experience building high-quality mobile and web UIs to specifications is a must to have. - Proficient in Java frameworks and tools used at Flex, including Spring (core/web/boot), Gradle, JUnit, and JVM (memory/performance tuning, GC). - Experience with Service-Oriented Architecture, REST APIs, Message Queues, and scalable architectures. - Experience with architectures and tools in React Native and React ecosystems (Hooks, Components, Context, Redux). - Experience with AWS (EKS, Aurora RDS, Elasticache, DynamoDB) and containerization tools. Preferred Qualifications - Have the experience to build and improve user onboarding funnel and design the comprehensive experiment to drive metric improvements. - Proficient in CI/CD systems (preferably GitHub Actions), git, and automation. - Skilled in observability and monitoring tools, such as DataDog, to ensure high availability. - Experienced with big data platforms and tooling, including Snowflake. - Proficient in Infrastructure as Code, using tools like CDK and Terraform. - Skilled at elevating team standards through best practices, and mentoring junior engineers. - Excellent written and verbal communicator, with experience in cross-functional collaboration. Flex takes a market-based approach to pay, and compensation may vary depending on your primary work location. Work locations are categorized into one of three tiers based on a cost of labor index for that geographic area. The successful candidate’s starting pay will be commensurate with their experience, qualifications, and Flex’s internal leveling guidelines and benchmarks. - Tier A (NYC/SF/Seattle): $200,000—$250,000 USD - Tier B: $180,000—$225,000 USD - Tier C: $170,000—$212,000 USD Life at Flex: We understand that it takes a diverse team of highly intelligent, curious, determined, empathetic, and self aware people to grow a successful company. Our HQ is located in New York City, but we have employees located throughout the US, Australia, Canada and South America. We are growing quickly, but deliberately, with a focus on building an inclusive culture. Our dynamic team has incredible perspectives to share, just as we know you do, and we take great pride in being an equal opportunity workplace. We offer many employee benefits & perks. For full-time U.S based positions we offer: - Competitive medical, dental, and vision available from Day 1 - Company equity - 401(k) plan with company match (our company match kicks off at the beginning of 2026) - Unlimited paid time off + 13 company paid holidays - Parental leave - Flex Cares Program - Free Flex subscription For full time non-US employees, we offer - Competitive compensation + company equity - Unlimited PTO

At Linkby, we believe great storytelling deserves to meet great audiences. We power a performance-based press release platform that helps D2C brands land editorial placements on premium publishers, but only pay for real clicks. We exist to amplify authentic voices and drive measurable impact in digital media. We're looking for a Senior Full Stack Developer to help us build and scale the next generation of our publishing marketplace. This role is about shipping high-quality features end-to-end on a lean, AI-augmented team where your output punches well above its weight. You'll also mentor teammates, contribute to technical direction, and raise the bar for how we build. About the role Location: North America, Remote-first (we have hubs in Sydney, London, Toronto and New York; occasional in-office/hybrid options) Employment Type: Full-time As a Senior Full Stack Developer, you'll own features from database to UI and everything in between. We're an AI-native engineering team - we treat tools like Cursor and Claude Code as core infrastructure, not nice-to-haves. You'll work closely with leadership and product to turn ambiguous problems into shipped software. Day to day, you will: - Design and implement high-quality, scalable and resilient web applications. - Ship features end-to-end in partnership with product managers and designers: design APIs, optimize queries, polish UI and own the outcomes. - Deploy and manage cloud-native applications on AWS, ensuring high availability, performance, and security. - Contribute to and influence architecture decisions that will shape how we scale the marketplace over the next 12–24 months. - Build AI-powered platform capabilities - semantic matching between brands and publishers, in-app agents, campaign performance prediction, etc. - Keep the platform fast, reliable, and secure under load; proactively address bottlenecks and production issues. - Implement security best practices (e.g. OWASP guidelines) and ensure compliance with data privacy regulations (e.g. GDPR, CCPA) across all development stages, including secure coding, data encryption, and access control. - Drive continuous improvement through code reviews, agentic workflows, automated testing, and CI/CD practices. - Mentor teammates through code reviews, pairing, and career development. About you - Proficiency in both front-end (JavaScript/TypeScript, Vue/React) and back-end (Node.js, Golang) technologies. - Fluency in databases (PostgreSQL, Clickhouse), APIs (REST/GraphQL), and cloud infrastructure (AWS/GCP). - Real experience directing agentic coding workflows: you've used tools like Cursor or Claude Code to scaffold entire features, caught the subtle bugs they introduce, and know where they reliably fall short. - Proficiency operating in both human-in-the-loop and human-on-the-loop paradigms - you know when a task needs you steering every step versus when you set constraints and let an agent run, then review the output. You can articulate why you'd choose one over the other for a given problem. - Strong understanding of software engineering principles, design patterns, and best practices - AI tools make you faster, but you know what's happening under the hood and can debug a production outage at 2 AM without them. - Experience integrating LLM APIs or ML models into production applications - not just calling an endpoint, but handling prompt management, output validation, cost control, and graceful degradation. - Comfort working in fast-moving environments: you bias for shipping, iterate quickly, and bring others along with you. - A track record of influencing architecture, scaling systems, and making pragmatic trade-offs. - Strong communication skills: you can advocate for smart technical decisions with leadership, while ensuring the team feels heard and supported. - Bonus: background in adtech, programmatic advertising, or marketplace platforms with proven track record in developing and scaling high-traffic, large-scale applications. If you don’t meet 100% of the above qualifications, you should still consider applying. Studies show that you can still be considered for a role if you meet just 50% of the position’s requirements. About us Linkby is a growing, VC-backed adtech startup on a mission to democratize the link between brands and trusted voices - helping both grow and thrive. We’re transforming how brands share their stories with the world’s most trusted publishers, on a platform that feels like magic. Our technology connects D2C advertisers with high-quality publishers and powers CPC-based press releases that turn great storytelling into measurable results. We believe transparency and effectiveness go hand in hand, and that every connection between a brand and a publisher should create value for both sides. We’re a remote-first team with hubs in key cities - Sydney, London, Toronto, and New York - for those who thrive on in-person collaboration. No matter where we’re based, we’re united by a shared vision and a set of values that shape how we work every day. Our Vision To transform how brands share their stories with the world’s most trusted voices - on a platform that feels like magic. Our Mission To democratize the link between brands and trusted voices, helping both grow and thrive. Core Linkby Values This is how we do it. 1. Excel with Kindness We’re thoughtful, equitable and team-first - with each other, and our partners. Kindness isn’t about being nice. It’s about honesty, empathy, and doing what’s right, even when it’s hard. We celebrate wins together, have each other’s backs, and approach challenges with care and accountability. 2. BYO Magic We’re hungry, curious, and each of us brings something unique to the table. That spark - your superpower - is what drives results, builds culture, and helps us stand out. We back processes that help us move fast, but we also leave room for individuality, creativity, and the kind of impact you can’t templatize. 3. Be a Maker We roll up our sleeves and find a way forward. No matter the challenge, we stay agile, take ownership, and get things done. Whether it’s a scrappy test or a big-picture shift, we’re all builders here. What we offer - Competitive salary + equity package (we believe in shared upside) - USD salary range $160,000-200,000/yr - CAD salary range $160,000-200,000/yr - Flexible remote work + optional office access - Generous paid time off / leave policy - Health & wellness benefits (depending on location) - Opportunities for fast growth, mentorship, and leadership - High autonomy and ownership - you’ll see the direct impact of your work Ready to apply? Send us your resume, links to your GitHub or portfolio, and a short note on what excites you about Linkby and this role. Interview process (typical): - Intro & role alignment chat - Technical assessment - Final interview with leadership We strive for fairness and transparency. If you don’t match every listed skill but bring passion, curiosity, and a strong foundation, we encourage you to apply. Note: You'll need valid work authorization in North America to join us.

Location: Remote  Description:  Seeking a Senior Developer to design, develop, and maintain high-quality software solutions. This role requires expertise in software architecture, coding best practices, and modern development frameworks. The ideal candidate will have a strong background in full-stack development, cloud computing, and Agile methodologies, working closely with cross-functional teams to deliver scalable and efficient software solutions.  Job Responsibilities:  - Participate in creating software development plans and strategies.   - Design, develop, and maintain scalable, high-performance software applications.  - Work as part of a team to write a specific section of the program  - Combine all elements of the program design and test it, ensuring sample data-sets yield output as intended  - Write clean, efficient, and well-documented code following industry best practices.  - Maintain and improve the performance of existing software  - Recommend improvements to existing software programs as necessary   - Participate in creating software development plans and strategies.  - Collaborate with architects, product managers, and other developers to define technical requirements and system design.  - Perform code reviews, mentor junior developers, and enforce coding standards.  - Develop and maintain RESTful APIs, microservices, and cloud-based applications.  - Optimize application performance, ensuring high availability, security, and scalability.  - Implement and maintain CI/CD pipelines, ensuring smooth deployments and automation.  - Work within Agile/Scrum development teams, participating in sprint planning, stand-ups, and retrospectives.  - Stay up to date with emerging technologies, advocating for best practices and continuous improvement.  - Must have experience in developing and implementing algorithms.

• Identify and execute improvements to the codebase that make it easier for both humans and AI agents to move fast and ship safely. • Work with a group of senior engineers in a low-process environment powered by trust and autonomy. • Drive decisions and consensus asynchronously with thoughtful documentation and specs. • Build new features from top to bottom — from UX to database. Ship fast. Learn fast. Repeat. • Architect scalable solutions and foundational patterns that let us efficiently launch new partner experiences. • Work directly with PMs and business partners to define and refine our roadmap. Your voice and technical vision matter. • Collaborate with a diverse group of people, giving and receiving feedback for growth.