Build and support complex features across C#/.NET back-end services and React front ends. Responsibilities include technical design, API and data modeling, secure and tested coding, production troubleshooting, code reviews, mentoring, documentation, and improving engineering practices. Collaborate with Product, QA, DevOps, Technical Leads, and architecture teams while balancing delivery, maintainability, performance, accessibility, observability, and security.
This is a remote position.
Senior Software Developer (C#/.NET and React)
Remote, Canada (occasional in-person team days in the Greater Toronto Area)
Full-time, permanent
About the company
Our client is an established, mission-driven Canadian technology organization. They run a high-traffic online payments platform used by thousands of organizations and a large base of individual users across the country. The engineering team is small enough that senior people have real influence, and the culture is collaborative, flexible and focused on doing work that matters.
The role
This is a senior hands-on engineering position. You will take large, sometimes loosely defined features and carry them all the way through: shaping the requirements, designing the solution, building it, testing it, shipping it and supporting it in production. The stack is a C#/.NET back end with a React front end.
You will be expected to make sound calls on your own, balance short-term delivery against long-term code health, and raise the level of the developers around you through reviews, mentoring and good technical conversation. You will work day to day with a Technical Lead, Product, QA and DevOps, and you should care about the "why" behind what the team builds, not only the "what" and "how".
What you will do;
Building and shipping
- Take ownership of complex features from early design through to production support
- Turn half-formed problems into clear, well-scoped technical work
- Write clean, secure, maintainable and well-tested code on both the front end and back end
- Flag risks, dependencies and blockers early in planning rather than late in delivery
- Dig into production issues on your own and fix root causes, not symptoms
Technical design
- Lead design at the feature level, covering APIs, data models and integrations
- Weigh trade-offs and recommend practical solutions
- Bring in the Technical Lead and architecture group when a decision has wider system impact
- Champion good practice around security, testing, observability, performance and documentation
- Simplify where possible, automate repetitive work and make life easier for other developers
- Build front-end experiences that are accessible, semantic and standards-compliant, with usability and SEO considered from the start
Raising the team
- Give thorough code reviews that look at correctness, design, security and maintainability
- Mentor other developers and help them grow more independent
- Share what you know through documentation, pairing, demos and workshops
- Influence how the wider team handles recurring technical problems
- Help improve how the team works, not just what it delivers
Requirements
- Around 6 or more years building and supporting complex production systems (what you have delivered matters more than the exact number)
- Strong C# and .NET skills, including RESTful APIs and back-end services
- Solid working knowledge of React and TypeScript/JavaScript
- Experience with relational databases such as SQL Server
- A history of troubleshooting production problems independently and leading design decisions
- Good technical judgment and comfort working through ambiguity
Nice to have
- Azure or another major cloud platform
- Automated testing and modern CI/CD
- Background in payments, fintech or another security-sensitive field
- Experience mentoring developers or building a strong code review culture
This is a current, open position. Our client is committed to an inclusive workplace and welcomes applicants from all backgrounds. All hiring decisions are made by people.
Similar Jobs
Cloud • Security • Software • Cybersecurity • Automation
Own complex enterprise customer escalations from engagement through resolution, coordinating Engineering, Support, Product, Customer Success, and Sales. Lead executive communications, maintain customer-facing resolution plans, manage commitments, coordinate with Incident Managers, and oversee post-escalation reviews and relationship repair. Develop escalation playbooks and process improvements while providing globally distributed, on-call support for high-severity customer situations.
Top Skills:
Ci/CdCloud-Native PlatformsDevsecopsGitlabPagerdutySalesforceSlackZendesk
Consumer Web • Coupons • Healthtech • Social Impact • Pharmaceutical
Provides independent legal counsel on healthcare regulations, employee benefits agreements, commercial contracts, AI initiatives, and product launches. Reviews pharmacy, telehealth, licensure, fraud and abuse, privacy, and healthcare product risks; negotiates agreements; develops AI governance processes, templates, playbooks, and training; monitors regulatory developments; and coordinates complex matters across legal, product, engineering, privacy, security, compliance, finance, and procurement teams.
Top Skills:
Artificial Intelligence (Ai)Telehealth
Artificial Intelligence • Cloud • Payments • Software • Business Intelligence • Generative AI • Automation
Leads enterprise-scale data architecture across batch, streaming, warehouse, lakehouse, transactional, AI, and vector-store use cases. Establishes data quality, governance, lineage, observability, access-control, and reliability standards. Defines AI-enabled data engineering patterns, mentors engineers, resolves complex architecture issues, and influences cross-functional roadmaps. Requires hands-on technical leadership and 15+ years of software, data engineering, or architecture experience.
Top Skills:
DbtGcp Bigquery
What you need to know about the NYC Tech Scene
As the undisputed financial capital of the world, New York City is an epicenter of startup funding activity. The city has a thriving fintech scene and is a major player in verticals ranging from AI to biotech, cybersecurity and digital media. It also has universities like NYU, Columbia and Cornell Tech attracting students and researchers from across the globe, providing the ecosystem with a constant influx of world-class talent. And its East Coast location and three international airports make it a perfect spot for European companies establishing a foothold in the United States.
Key Facts About NYC Tech
- Number of Tech Workers: 549,200; 6% of overall workforce (2024 CompTIA survey)
- Major Tech Employers: Capgemini, Bloomberg, IBM, Spotify
- Key Industries: Artificial intelligence, Fintech
- Funding Landscape: $25.5 billion in venture capital funding in 2024 (Pitchbook)
- Notable Investors: Greycroft, Thrive Capital, Union Square Ventures, FirstMark Capital, Tiger Global Management, Tribeca Venture Partners, Insight Partners, Two Sigma Ventures
- Research Centers and Universities: Columbia University, New York University, Fordham University, CUNY, AI Now Institute, Flatiron Institute, C.N. Yang Institute for Theoretical Physics, NASA Space Radiation Laboratory
