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Senior Software Engineer (.NET, Node.js, React) at OpsFlow. Location Information: Anywhere in the World. . . Headquarters:. Poland . URL:. . https://www.opsflowhq.com/. . . Role:. Senior Software Engineer. Contract type:. B2B, Independent contractor. Duration:. ~3-6 months. Day rate:. $250 - $325 USD (~$5k - $6.5k/month). Domain:. Wholesale Distribution. Tech stack:. .NET, Node.js, React. Location:. Remote. . ---. . Our client, a UK-based B2B SaaS startup, is seeking a Senior Software Engineer on a contract basis to expand the functionality of their ERP product for the wholesale distribution industry.. . You'll work across the stack, spending 70% of your time on the backend and 30% on the frontend.. . As part of a small engineering team, you'll work alongside the technical founder and take ownership of the entire SDLC, from analysing business requirements to deployment.. . You won't just write code, you'll help shape the product and make important technical decisions.. . Company. . Our client is an early-stage B2B SaaS startup building a niche ERP software product for the wholesale distribution industry.. . The company is led by a technical founder with 15+ years of software engineering experience and is currently developing its product in close partnership with its first enterprise customer.. . Tech Stack. . Note that this role doesn't require proficiency across the entire stack.. . The product uses the following technologies:. . . Backend: . ASP.NET. Core, Node.js (Nest.js), PostgreSQL, RabbitMQ, Ably (streaming). . Frontend: React, Next.js, TypeScript. . Mobile: React Native, Expo. . Infrastructure: Vercel, Digital Ocean. . . The backend is a dual stack with services split between .NET and Node.js.. . Responsibilities. . . Analyse business requirements and work with colleagues to break down features. . Design, build and run backend systems using .NET and Node.js. . Contribute to the development of the frontend systems using React.js. . Own full SDLC from requirements gathering to deployment and monitoring. . Collaborate on technical architecture, UX and product decisions.. . Take ownership of technical decisions, ensuring alignment with business goals. . Participate in planning and manage your own tasks.. . . Qualifications. . Essential:. . . 5+ years of commercial experience in backend software engineering.. . Strong expertise with C#, . ASP.NET. and Node.js (Ideally with Nest.js or Express.js).. . Experience with Docker, Linux, Git, and container-based environments.. . Commercial experience in frontend development using React.js/Next.js/TypeScript.. . Experience in automated testing and understanding the value it unlocks.. . Comfortable owning projects end-to-end and working in the ambiguity of a startup environment.. . Strong engineering mindset and solution-oriented approach.. . Good product sense and empathy for users. . Can do attitude and ability to figure out things on your own.. . . Beneficial:. . . Experience in mobile development with React Native.. . Experience building CI/CD pipelines (e.g., Jenkins, GitLab CI, GitHub Actions).. . Experience working with cloud platforms (e.g., Vercel, DO, AWS, GCP).. . Experience working with fleets of IoT hardware.. . Responsible use of AI coding tools (Claude, Cursor).. . . Hiring process. . . CV review. . Intro call with talent partner (60 minutes). . Interview with the client (60minutes). . Offer stage. . . What we offer. . . Competitive compensation: $250-$325 USD per day (~$5k-$6.5k/month). . Challenging project you’d be proud to have in your portfolio. . High autonomy with an opportunity to influence technical decisions and product direction. . Direct collaboration with an experienced technical founder. . Work where you want, remotely. . . . . . . To apply:. . https://weworkremotely.com/remote-jobs/opsflow-senior-software-engineer-net-node-js-react.